JP2014017563A - Communication control method, communication control program, and communication control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of two-way communication with a client device.SOLUTION: A communication control device 101 connects with a client device 102 if it has accepted a connection request R1 from the client device 102. The communication control device 101 refers to a storage unit 110 and determines whether an update frequency F of data D requested by the client device 102 during connection is less than a threshold value For not. The communication control device 101 transmits a reconnection instruction to the client device 102 if the update frequency F of the data D is less than the threshold value F. The communication control device 101 disconnects connection with the client device 102 as a result of transmitting the reconnection instruction. The client device 102 changes a communication mode with the communication control device 101 from stateful communication to stateless communication if it has accepted the reconnection instruction from the communication control device 101.

Description

  The present invention relates to a communication control method, a communication control program, and a communication control apparatus.

  Web socket (WebSocket) is a technology for a server and a client device to perform bidirectional communication. In the web socket, after establishing the connection, the server and the client device can exchange data by socket communication unless the connection is disconnected.

  As a related prior art, for example, there is an information distribution system for efficiently allocating communication resources to users in information distribution using VPN (Virtual Private Network). Specifically, for example, the information distribution system includes a communication terminal device, an information distribution server device, a distribution relay device, and an access relay device. The access relay apparatus establishes a connection, session, or tunnel for communicating with another apparatus based on a communication policy set for each object constituting the content. The access relay apparatus performs data relay processing via a connection, session, or tunnel based on a communication policy set in units of objects.

JP 2004-153776 A

  However, in the conventional technology, while the connection between the server and the client device is maintained, the network resource of the server is continuously allocated to the client device, which causes an increase in the usage amount of the network resource of the server. is there.

  In one aspect, an object of the present invention is to provide a communication control method, a communication control program, and a communication control device that improve the efficiency of bidirectional communication with a client device.

  According to one aspect of the present invention, connection to the client device is performed using a first communication method that can repeatedly perform data communication to the client device based on data requested from the client device while maintaining a connection state with the client device. During, referring to a storage unit that stores information representing the frequency at which the data is updated, determine whether the data update frequency is less than a threshold, and if the data update frequency is less than the threshold, A result of sending a reconnection instruction to the client apparatus for instructing a connection request in the second communication method for disconnecting the connection with the client apparatus each time the data communication is performed, and transmitting the reconnection instruction A communication control method, a communication control program, and a communication control device for disconnecting the connection with the client device are proposed.

  According to one aspect of the present invention, it is possible to improve the efficiency of bidirectional communication with a client device.

FIG. 1 is an explanatory diagram of an example of the communication control method according to the first embodiment. FIG. 2 is an explanatory diagram showing a system configuration example of the information providing system 200. FIG. 3 is a block diagram illustrating a hardware configuration example of the server 201. FIG. 4 is a block diagram illustrating a hardware configuration example of the client device 202. FIG. 5 is an explanatory diagram showing an example of the contents stored in the update frequency DB 220. FIG. 6 is an explanatory diagram (part 1) illustrating an example of the contents stored in the update log table 600. FIG. 7 is an explanatory diagram (part 1) illustrating an example of the contents stored in the access log management table 700. FIG. 8 is a block diagram of a functional configuration example of the server 201 according to the first embodiment. FIG. 9 is an explanatory diagram showing a specific example of the communication change program P. FIG. 10 is a block diagram illustrating a functional configuration example of the client device 202. FIG. 11 is a flowchart of an example of a communication control processing procedure of the server 201 according to the first embodiment. FIG. 12 is a flowchart of an example of a communication processing procedure of the client apparatus 202 according to the first embodiment. FIG. 13 is an explanatory diagram of an example of the contents stored in the switching period table 1300. FIG. 14 is an explanatory diagram (part 2) of an example of the stored contents of the update log table 600. FIG. 15 is a block diagram of a functional configuration example of the server 201 according to the second embodiment. FIG. 16 is a flowchart of an example of a switching period calculation process procedure of the server 201 according to the second embodiment. FIG. 17 is a flowchart of an example of a communication control processing procedure of the server 201 according to the second embodiment. FIG. 18 is an explanatory diagram showing an example of the stored contents of the store information management table 1800. FIG. 19 is an explanatory diagram showing an example of the contents stored in the store status management table 1900. FIG. 20 is an explanatory diagram illustrating a screen example of the management screen. FIG. 21 is an explanatory diagram (part 2) of an example of the contents stored in the access log management table 700. FIG. 22 is a block diagram of a functional configuration example of the server 201 according to the third embodiment. FIG. 23 is a flowchart of an example of a first communication control process procedure of the server 201 according to the third embodiment. FIG. 24 is a flowchart of an example of a second communication control process procedure of the server 201 according to the third embodiment. FIG. 25 is a flowchart of an example of a third communication control process procedure of the server 201 according to the third embodiment. FIG. 26 is an explanatory diagram showing the relationship between the store status and the communication format. FIG. 27 is an explanatory diagram showing the relationship between the store status of a plurality of stores and the communication format.

  Exemplary embodiments of a communication control method, a communication control program, and a communication control device according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is an explanatory diagram of an example of the communication control method according to the first embodiment. In FIG. 1, the communication control apparatus 101 is a computer having a storage unit 110 and capable of bidirectional communication with the client apparatus 102. The communication control device 101 is, for example, a web server that provides the client device 102 with data D requested by the client device 102.

  The client device 102 is a computer capable of bidirectional communication with the communication control device 101. Software for allowing the user to browse the data D provided from the communication control apparatus 101 is installed in the client apparatus 102. The data D is information in which information contents such as restaurants, railroads, airplane seat availability and reservation status, stock price and real-time charts of exchange rates, baseball and soccer game status, etc. are updated every moment.

  Here, there is a mechanism called a real-time web that reflects the update of the data D in real time and provides the updated data D to the user in real time. As a technique for realizing a real-time web, there is a web socket proposed in HTML5, which is a standard specification of HTML (HyperText Markup Language).

  In the web socket, after establishing the connection with the client device, the server can exchange data by socket communication without being aware of the communication procedure unless the connection is disconnected. However, the server continues to allocate network resources to the client device while maintaining the connection with the client device. For this reason, as the number of users connected to the server increases, the network resources of the server may be exhausted.

  On the other hand, CPU (Central Processing Unit) resources of the server are consumed when data is exchanged with the client device. For this reason, even if the server network resources are depleted, the CPU resources often have room, and the CPU resources of the server may not be fully utilized.

Therefore, in the first embodiment, the communication control apparatus 101 determines whether the update frequency F of the data D accessed by the connected client apparatus 102 using, for example, a web socket is less than the threshold value F _th . Then, when the update frequency F of the data D is less than the threshold value F _th , the communication control apparatus 101 changes the communication format with the client device 102 to a communication format that disconnects the connection every time data communication is performed. As a result, the network resources of the communication control apparatus 101 are prevented from being exhausted, and the CPU resources of the communication control apparatus 101 are efficiently used. Hereinafter, an example of the communication control process of the communication control apparatus 101 according to the first embodiment will be described.

  (1) When the communication control apparatus 101 receives the connection request R1 from the client apparatus 102, the communication control apparatus 101 connects to the client apparatus 102. Specifically, for example, the communication control apparatus 101 establishes a connection with the client apparatus 102 by assigning network resources of the own apparatus to the client apparatus 102. The network resource is, for example, a port of the communication control apparatus 101.

  Here, the connection request R1 is a connection request for stateful communication. Stateful communication is a communication method in which data communication to the client device 102 based on the data D requested by the client device 102 can be repeated while maintaining the connection state with the client device 102. The communication method of the web socket is stateful communication.

  Data communication based on data D includes, for example, transmission of data D in response to a data request from the client apparatus 102, transmission of updated data D to the client apparatus 102 when the data D is updated, and the like. Further, the data communication based on the data D includes, for example, transmission of a message indicating that the data D corresponding to the data request from the client apparatus 102 has not been updated from the previous data request.

(2) The communication control apparatus 101 refers to the storage unit 110 and determines whether or not the update frequency F of the data D requested from the connected client apparatus 102 is less than the threshold value F _th . The storage unit 110 is a database that stores information representing an update frequency F at which the data D is updated.

  In the real-time web, the higher the update frequency F, the more opportunities to provide the updated data D to the user, so the need to maintain the connection state between the communication control device 101 and the client device 102 increases. On the other hand, as the update frequency F is lower, the opportunity to provide the updated data D to the user is reduced, and the necessity of maintaining the connection state between the communication control device 101 and the client device 102 is reduced.

The communication control apparatus 101 determines whether or not the connection state with the client apparatus 102 should be maintained depending on whether or not the update frequency F of the data D is less than the threshold value F _th . For example, the threshold F _th is set to a value that allows the communication control apparatus 101 to determine that the connection state with the client apparatus 102 should be maintained when the update frequency F is equal to or greater than the threshold F _th .

In the example of FIG. 1, since the update frequency F of the data D is less than the threshold value F _th, it is assumed that the necessity of maintaining the connection state between the communication control device 101 and the client device 102 is low.

(3) When the update frequency F of the data D is less than the threshold value F _th , the communication control apparatus 101 transmits a reconnection instruction to the client apparatus 102. Here, the reconnection instruction is an instruction to make a connection request R2 for stateless communication. Stateless communication is a communication method in which the connection with the client apparatus 102 is disconnected each time data communication to the client apparatus 102 based on the data D requested by the client apparatus 102 is performed.

  Further, the communication control apparatus 101 may set the reconnection time T in the reconnection instruction. The reconnection time T specifies the timing for transmitting a connection request R2 for stateless communication. Specifically, for example, the communication control apparatus 101 transmits to the client apparatus 102 a reconnection instruction that instructs to make a connection request R2 to the communication control apparatus 101 after the reconnection time T has elapsed.

  (4) As a result of transmitting the reconnection instruction, the communication control apparatus 101 disconnects the connection with the client apparatus 102. As a result, the network resource of the communication control apparatus 101 allocated to the client apparatus 102 is released, and the network resource can be allocated to another client apparatus 102.

  (5) When the client apparatus 102 receives a reconnection instruction from the communication control apparatus 101, the client apparatus 102 changes the communication method with the communication control apparatus 101 from stateful communication to stateless communication. The client apparatus 102 transmits a connection request R2 for stateless communication to the communication control apparatus 101 after the reconnection time T has elapsed since the connection with the communication control apparatus 101 was disconnected.

  As a result, the communication control apparatus 101 and the client apparatus 102 are reconnected, and the latest data D is provided from the communication control apparatus 101 to the client apparatus 102.

  As described above, according to the communication control apparatus 101 according to the first embodiment, the necessity of maintaining the connection state with the client apparatus 102 is determined from the update frequency F of the data D requested from the client apparatus 102, and the client apparatus The communication format with 102 can be changed.

  For example, when it is less necessary to maintain the connection state with the client device 102 that is connected by stateful communication, the communication format with the client device 102 can be changed to stateless communication. As a result, it is possible to release the network resource that has been allocated to the client device 102 that is less necessary to maintain the connection state, and to allocate the network resource to another client device 102.

  In addition, as a result of changing the communication format with the client device 102 to stateless communication, if the necessity of maintaining the connection state with the client device 102 increases, the communication format with the client device 102 can be changed to stateful communication. . Thereby, the real time property at the time of providing data D updated every moment to a user is securable.

  For these reasons, according to the communication control apparatus 101, it is possible to improve the efficiency of bidirectional communication with the client apparatus 102. Specifically, for example, the network resources of the communication control apparatus 101 can be prevented from being exhausted, the CPU resources of the communication control apparatus 101 can be efficiently used, and the cost for realizing the service can be suppressed.

(System configuration example of the information providing system 200)
Next, the information providing system 200 according to the first embodiment will be described by taking the case where the communication control apparatus 101 shown in FIG. 1 is applied to the server 201 as an example.

  FIG. 2 is an explanatory diagram showing a system configuration example of the information providing system 200. In FIG. 2, the information providing system 200 includes a server 201 and a plurality of client devices 202. In the information providing system 200, the server 201 and the client device 202 are connected via a wired or wireless network 210. The network 210 is, for example, the Internet, a LAN (Local Area Network), a WAN (Wide Area Network), or the like.

  Here, the server 201 is a computer having an update frequency DB (database) 220 and capable of bidirectional communication with the client device 202 using a web socket. The server 201 is realized by, for example, a web server, an application server, a database server, or the like.

  The update frequency DB 220 stores data D requested from the client device 202 and the update frequency F of the data D in association with each other. The update frequency DB 220 corresponds to, for example, the storage unit 110 illustrated in FIG. The contents stored in the update frequency DB 220 will be described later with reference to FIG.

  The client device 202 is a computer capable of bidirectional communication with the server 201 using a web socket. The client device 202 corresponds to the client device 102 illustrated in FIG. The client device 202 is, for example, a PC (personal computer) on which a web browser is installed, a notebook PC, a smartphone, a mobile phone, a tablet computer, or the like.

  In the information providing system 200, the server 201 can transmit the updated data D to the client device 202 each time the data D requested from the client device 202 connected by stateful communication is updated. Further, the client device 202 can acquire the data D stored in the update frequency DB 220 from the server 201 by transmitting a data D acquisition request to the server 201.

(Hardware configuration example of server 201)
FIG. 3 is a block diagram illustrating a hardware configuration example of the server 201. In FIG. 3, a server 201 includes a CPU 301, a ROM (Read-Only Memory) 302, a RAM (Random Access Memory) 303, an I / F (Interface) 304, a magnetic disk drive 305, a magnetic disk 306, have. Each component is connected by a bus 300.

  Here, the CPU 301 governs overall control of the server 201. The ROM 302 stores a program such as a boot program. The RAM 303 is used as a work area for the CPU 301.

  The I / F 304 is connected to the network 210 via a communication line, and is connected to another computer (for example, the client device 202) via the network 210. The I / F 304 controls an internal interface with the network 210 and controls input / output of data from other computers. For example, a modem or a LAN adapter may be employed as the I / F 304.

  The magnetic disk drive 305 controls the reading / writing of the data with respect to the magnetic disk 306 according to control of CPU301. The magnetic disk 306 stores data written under the control of the magnetic disk drive 305. The server 201 may include, for example, an SSD (Solid State Drive), a keyboard, and a display in addition to the above-described components.

(Hardware configuration example of client device 202)
FIG. 4 is a block diagram illustrating a hardware configuration example of the client device 202. 4, the client device 202 includes a CPU 401, a ROM 402, a RAM 403, a magnetic disk drive 404, a magnetic disk 405, an I / F 406, a display 407, a keyboard 408, and a mouse 409. Yes. Each component is connected by a bus 400.

  Here, the CPU 401 governs overall control of the client device 202. The ROM 402 stores programs such as a boot program. The RAM 403 is used as a work area for the CPU 401. The magnetic disk drive 404 controls the reading / writing of the data with respect to the magnetic disk 405 according to control of CPU401. The magnetic disk 405 stores data written under the control of the magnetic disk drive 404.

  The I / F 406 is connected to the network 210 via a communication line, and is connected to another computer (for example, the server 201) via the network 210. The I / F 406 serves as an internal interface with the network 210 and controls input / output of data from other computers. For example, a modem or a LAN adapter may be employed as the I / F 406.

  The display 407 displays data such as a document, an image, and function information as well as a cursor, an icon, or a tool box. As this display 407, for example, a CRT (Cathode Ray Tube), a TFT (Thin Film Transistor) liquid crystal display, a plasma display, or the like can be adopted.

  The keyboard 408 includes keys for inputting characters, numbers, various instructions, and the like, and inputs data. Moreover, a touch panel type input pad or a numeric keypad may be used. The mouse 409 performs cursor movement, range selection, window movement, size change, and the like.

  The client device 202 may include, for example, an optical disk drive, an optical disk, a scanner, a printer, and the like in addition to the above-described components.

(Storage contents of update frequency DB 220)
Next, the contents stored in the update frequency DB 220 shown in FIG. 2 will be described. The update frequency DB 220 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 5 is an explanatory diagram showing an example of the contents stored in the update frequency DB 220. In FIG. 5, the update frequency DB 220 includes fields for data name, URL (Uniform Resource Locator), data content, and update frequency. By setting information in each field, update frequency information 500-1 to 500-n of data D1 to Dn is stored as a record.

  Here, the data name is a name that uniquely identifies the data D. The URL indicates the storage location of the data D. The data content is information representing the content of the data D. The data content is updated each time the data D is updated. The update frequency represents the frequency with which the data D is updated.

  For example, the update frequency information 500-1 represents the data name “D1”, the URL “/ dataD1 /”, the data content “...”, And the update frequency “F1” of the data D1.

  In the following description, arbitrary data among the data D1 to Dn stored in the update frequency DB 220 may be expressed as “data Di”, and the update frequency of the data Di may be expressed as “update frequency Fi”. Yes (i = 1, 2,..., N).

(Storage contents of update log table 600)
Next, the storage contents of the update log table 600 used by the server 201 will be described. The update log table 600 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 6 is an explanatory diagram (part 1) illustrating an example of the contents stored in the update log table 600. In FIG. 6, the update log table 600 has fields for data name, update date and time, and update interval. By setting information in each field, update logs (for example, update logs 600-1 to 600-4) are stored as records.

  Here, the data name is the name of the data Di stored in the update frequency DB 220. The update date / time is the date / time when the data Di was updated. The update interval represents a time difference between the current update date and time when the data Di is updated and the previous update date and time. Here, the unit of the update interval is [seconds].

  For example, the update log 600-1 indicates the update date and time “2012/3/20 9:00:00” and the update interval “1” of the data D1.

  The stored contents of the update log table 600 are updated each time the data Di stored in the update frequency DB 220 is updated. Specifically, for example, when the data Di is updated, the server 201 sets information in each field of the data name, update date and update interval, and a new update log is stored as a record.

(Storage contents of access log management table 700)
Next, the storage contents of the access log management table 700 used by the server 201 will be described. The access log management table 700 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 7 is an explanatory diagram (part 1) illustrating an example of the contents stored in the access log management table 700. In FIG. 7, the access log management table 700 has fields for user name, URL, and access date / time. By setting information in each field, an access log (for example, access logs 700-1 to 700-4) is stored as a record.

  Here, the user name is a name that uniquely identifies the user of the client device 202. For example, the server 201 can identify the web browser of the client device 202 from the user name. The user name may be, for example, an IP (Internet Protocol) address of the client device 202 or a combination of an IP address of the client device 202 and a port number assigned to the client device 202.

  The URL is the URL of the data Di accessed by the user of the client device 202. The data Di accessed by the user of the client device 202 can be specified from the URL of the data Di. The access date and time is the date and time when the user of the client device 202 accesses the data Di.

  For example, the access log 700-1 indicates the URL “/ dataD1 /” and the access date “2012/03/20 09:05:00” of the data D1 accessed by the user U1. According to the access log management table 700, the number of users connected to the server 201 (the number of access logs) can be specified.

  Note that the access log may include information for specifying whether the server 201 and the client device 202 are connected using a stateful communication or a stateless communication. Further, the access log management table 700 may store only an access log for specifying the client device 202 connected by stateful communication.

(Example of functional configuration of server 201)
Next, a functional configuration example of the server 201 according to the first embodiment will be described. FIG. 8 is a block diagram of a functional configuration example of the server 201 according to the first embodiment. In FIG. 8, the server 201 includes a reception unit 801, a connection unit 802, a calculation unit 803, a determination unit 804, an instruction unit 805, and a cutting unit 806. The receiving unit 801 to the cutting unit 806 are functions as control units. Specifically, for example, the CPU 301 executes a program stored in a storage device such as the ROM 302, the RAM 303, and the magnetic disk 306 shown in FIG. Or the I / F 304 realizes the function. The processing result of each functional unit is stored in a storage device such as the RAM 303 and the magnetic disk 306, for example.

  The accepting unit 801 has a function of accepting a connection request from the client device 202. The connection request from the client device 202 includes, for example, an acquisition request for data Di stored in the update frequency DB 220. The connection request from the client device 202 may include the user name of the user who is using the web browser of the client device 202. Specifically, for example, the receiving unit 801 receives a connection request transmitted from the web browser of the client device 202 via the I / F 304 illustrated in FIG.

  In the following description, a connection request from the client device 202 is denoted as “connection request R”, in particular, a connection request for stateful communication is denoted as “connection request R1”, and a connection request for stateless communication is denoted as “connection request R2”. May be written. Further, the web browser of the client device 202 may be referred to as “web browser B”.

  The connection unit 802 has a function of connecting to the client device 202 when the connection request R is received from the client device 202. Specifically, for example, the connection unit 802 assigns a port number for identifying a communication partner to the web browser B, thereby establishing a connection with the web browser B.

  Here, the port number corresponds to the network resource of the server 201. There is a limit to the number of port numbers that can be assigned. For example, the assignable port numbers are 0 to 65535. When the connection with the web browser B is established, the server 201 and the web browser B can exchange data Di by socket communication without being aware of the communication procedure unless the connection is disconnected.

  When the connection with the web browser B is established, the stored contents of the access log management table 700 are updated. Specifically, for example, when the connection unit 802 sets information in each field of the access log management table 700, a new access log is stored as a record. At this time, the connection unit 802 may register a new access log in the access log management table 700 when the connection with the web browser B is established by stateful communication.

  The calculation unit 803 has a function of calculating the update frequency Fi of the data Di based on the update date and time when the data Di is updated. Here, the update frequency Fi of the data Di is an index for determining the necessity of maintaining the connection state between the server 201 and the client device 202 that requests the data Di.

  Specifically, for example, first, the calculation unit 803 extracts an update log of the data Di from the update log table 600 illustrated in FIG. Next, the calculation unit 803 calculates an average value of update intervals of the data Di (hereinafter referred to as “average update interval t”) based on the extracted update log of the data Di. Then, the calculation unit 803 may calculate the update frequency Fi (Fi = 1 / t) of the data Di by obtaining the inverse of the calculated average update interval t of the data Di.

  The calculated update frequency Fi of the data Di is stored in the update frequency DB 220, for example. Specifically, for example, the calculation unit 803 overwrites the calculated update frequency Fi of the data Di in the update frequency field of the data Di of the update frequency DB 220.

  When calculating the update frequency Fi of the data Di, the calculation unit 803 may extract an update log in which the update date and time of the data Di is included in the predetermined period X from the update log table 600. The predetermined period X is, for example, a period from the time point that is a unit time (for example, 30 minutes, 1 hour, 12 hours, 24 hours, etc.) back to the current time. Thereby, the update frequency Fi of the data Di in the predetermined period X can be calculated.

The determination unit 804 has a function of determining whether or not the update frequency Fi of data Di requested from the connected client device 202 is less than the threshold value F _th . Here, the data Di requested from the connected client device 202 can be specified from the URL of the access log management table 700 shown in FIG. 7, for example.

Further, as described above, the threshold value F _th is set to a value that can determine that the connection state between the server 201 and the client device 202 should be maintained, for example, when the update frequency Fi is equal to or higher than the threshold value F _th . The threshold value F _th is stored in a storage device such as the ROM 302, the RAM 303, and the magnetic disk 306, for example.

Specifically, for example, the determination unit 804 refers to the update frequency DB 220 and determines whether the update frequency Fi of the data Di requested from the connected web browser B is less than the threshold value F _th . Thereby, it can be determined whether or not the connection state between the server 201 and the web browser B of the client device 202 should be maintained.

Note that a data update frequency different from the data Di may be used as the threshold value F _th to be compared with the data Di update frequency Fi. Specifically, for example, the update frequency of the data with the lowest update frequency among the data different from the data Di may be used as the threshold value F _th to be compared with the update frequency Fi of the data Di.

  The instruction unit 805 has a function of transmitting a reconnection instruction to the client device 202 based on the determination result determined by the determination unit 804. Here, the reconnection instruction instructs the client apparatus 202 to make a connection request R to the server 201. The reconnection instruction includes a first reconnection instruction and a second reconnection instruction.

Specifically, for example, when the update frequency Fi of the data Di requested from the web browser B connected by stateful communication is less than the threshold value F _th , the instruction unit 805 controls the I / F 304 to perform the first A reconnection instruction is transmitted to the web browser B. The first reconnection instruction instructs the web browser B to make a connection request R2 for stateless communication with the server 201.

  In addition, the instruction unit 805 may transmit a first reconnection instruction to the web browser B to instruct the web browser B to make a connection request R2 for stateless communication to the server 201 at a predetermined time interval. Specifically, for example, the instruction unit 805 may set the reconnection time T in the first reconnection instruction.

  The reconnection time T specifies the timing at which the client apparatus 202 transmits a connection request R2 for stateless communication. The reconnection time T may be, for example, a predetermined time (for example, several seconds or several tens of seconds), or may be calculated from the average update interval t of the data Di.

  More specifically, for example, the instruction unit 805 may calculate a value obtained by multiplying the average update interval t of the data Di by a constant α as the reconnection time T. The constant α is, for example, “0.5”, “1.0”, “2.0”, or the like. The instruction unit 805 may set the date and time when the client apparatus 202 transmits the connection request R2 for stateless communication as the reconnection time T.

  Thereby, the communication format with the web browser B with low necessity of maintaining a connection state with the server 201 can be changed from stateful communication to stateless communication.

In addition, for example, when the update frequency Fi of the data Di requested from the web browser B connected by stateless communication is equal to or higher than the threshold value F _th , the instruction unit 805 controls the I / F 304 to perform the second reconnection instruction. Is transmitted to the web browser B. The second reconnection instruction instructs the web browser B to make a connection request R1 for stateful communication with the server 201.

  Thereby, the communication format with the web browser B which needs to maintain a connection state with the server 201 can be changed from stateless communication to stateful communication.

More specifically, for example, when the update frequency Fi of the data Di requested from the web browser B connected by stateful communication is less than the threshold value F _th , the instruction unit 805 transmits the communication change program P to the web browser B. You may decide to do it. The communication change program P is a script (for example, JavaScript: registered trademark) for changing the communication method with the server 201.

  That is, the communication change program P is a script that changes the communication method with the server 201 from stateful communication to stateless communication when the first reconnection instruction is received. The communication change program P is a script that changes the communication method with the server 201 from stateless communication to stateful communication when the second reconnection instruction is received.

  According to the communication change program P, the web browser B can change the communication method with the server 201 from stateful communication to stateless communication when receiving the first reconnection instruction. Further, when receiving the second reconnection instruction, the web browser B can change the communication method with the server 201 from stateless communication to stateful communication.

  Further, the instruction unit 805 may set the reconnection time T until the client device 202 makes the connection request R2 for stateless communication in the communication change program P. Accordingly, when the first reconnection instruction is received, the web browser B can transmit a connection request R2 for stateless communication to the server 201 after the reconnection time T has elapsed. At this time, the web browser B may repeatedly transmit a connection request R2 for stateless communication to the server 201 every time the reconnection time T elapses.

  A specific example of the communication change program P will be described later with reference to FIG. The first reconnection instruction or the second reconnection instruction may include data Di requested from the web browser B of the client device 202.

  The disconnecting unit 806 has a function of disconnecting the connection with the client device 202. Specifically, for example, as a result of the reconnection instruction being transmitted to the web browser B, the disconnecting unit 806 releases the connection established with the web browser B. Thereby, the port number assigned to the web browser B is released, and the port number can be assigned to another web browser.

  Further, when the connection with the web browser B is disconnected, for example, the disconnection unit 806 deletes the access log of the disconnected web browser B from the access log management table 700 illustrated in FIG. The access log to be deleted can be specified from the user name of the user using the web browser B.

(Specific example of the communication change program P)
Here, a specific example of the communication change program P transmitted from the server 201 to the client device 202 will be described.

  FIG. 9 is an explanatory diagram showing a specific example of the communication change program P. In FIG. 9, the communication change program P is a script for the web browser B of the client device 202 to change the communication method with the server 201 (“http: // localhost /” in FIG. 9). Specifically, for example, when the web browser B executes the communication change program P, the following processing is executed in response to data communication from the server 201 to the client device 202.

  The web browser B displays the message data on the display 407 when “close” is not described at the head of the message received from the server 201 connected by stateful communication. This data corresponds to the data Di requested by the client device 202.

  On the other hand, when “close” is described at the head of the message received from the server 201 connected by the stateful communication, the web browser B ends the stateful communication with the server 201. This “close” corresponds to the first reconnection instruction described above. Then, the web browser B transmits a connection request R2 for stateless communication to the server 201 after a time t (t = 3000 [ms]) has elapsed since the end of the stateful communication. This time t corresponds to the reconnection time T described above.

  Thereafter, the web browser B transmits a connection request R2 for stateless communication to the server 201 at time t intervals until a response in which “open” is described at the head of the data is received from the server 201.

  Further, the web browser B displays the response data on the display 407 when “open” is not described at the head of the response data received from the server 201 connected by stateless communication. This data corresponds to the data Di requested by the client device 202.

  On the other hand, when “open” is described at the head of the response data received from the server 201 connected by stateless communication, the web browser B transmits a connection request R1 for stateful communication to the server 201. This “open” corresponds to the above-described second reconnection instruction.

(Functional configuration example of client device 202)
Next, a functional configuration example of the client device 202 will be described. FIG. 10 is a block diagram illustrating a functional configuration example of the client device 202. In FIG. 10, the client device 202 includes a request unit 1001, a reception unit 1002, and a change unit 1003. The request unit 1001 to the change unit 1003 are functions serving as control units. Specifically, for example, programs stored in a storage device such as the ROM 402, the RAM 403, and the magnetic disk 405 illustrated in FIG. The function is realized by causing the CPU 401 to execute the communication change program P) shown or by the I / F 406. Further, the processing results of the respective functional units are stored in a storage device such as the RAM 403 and the magnetic disk 405, for example.

  The request unit 1001 has a function of transmitting a connection request R to the server 201. Specifically, for example, the request unit 1001 transmits a connection request R1 for stateful communication to the server 201 by a user operation input using the keyboard 408 and the mouse 409 shown in FIG.

  The receiving unit 1002 has a function of receiving a reconnection instruction from the connected server 201. Specifically, for example, the accepting unit 1002 accepts the first reconnection instruction transmitted from the server 201 connected by stateful communication via the I / F 406 shown in FIG. Further, for example, the accepting unit 1002 accepts the second reconnection instruction transmitted from the server 201 connected by stateless communication via the I / F 406.

  The changing unit 1003 has a function of changing the communication format with the server 201 when the reconnection instruction is received by the receiving unit 1002. Specifically, for example, when the first reconnection instruction is accepted, the changing unit 1003 ends the stateful communication with the server 201 and controls the request unit 1001 after the reconnection time T has elapsed, A connection request R2 for stateless communication is transmitted to the server 201. Thereby, the communication format with the server 201 can be changed from stateful communication to stateless communication.

  For example, when the second reconnection instruction is accepted, the changing unit 1003 transmits a connection request R1 for stateful communication to the server 201. Thereby, the communication format with the server 201 can be changed from stateless communication to stateful communication.

  Note that when the data Di is included in the first reconnection instruction or the second reconnection instruction, the client device 202 may display the data Di on the display 407.

(Communication control processing procedure of server 201)
Next, a communication control processing procedure of the server 201 according to the first embodiment will be described. Here, it is assumed that the communication change program P (see FIG. 9) has been transmitted from the server 201 to the client device 202. Specifically, for example, the communication change program P is transmitted from the server 201 to the client device 202 when the first reconnection instruction is first transmitted to the client device 202 connected by stateful communication.

  FIG. 11 is a flowchart of an example of a communication control processing procedure of the server 201 according to the first embodiment. In the flowchart of FIG. 11, first, the server 201 determines whether or not a connection request R has been received from the web browser B of the client device 202 (step S1101).

  Here, the server 201 waits to receive a connection request R from the web browser B (step S1101: No). When the connection request R is received from the web browser B (step S1101: Yes), the server 201 connects to the web browser B (step S1102).

  Next, the server 201 extracts, from the update log table 600, the update log of the data Di whose update date and time is included in the predetermined period X from the update log of the data Di requested from the web browser B (step S1103). . Then, the server 201 calculates the update frequency Fi of the data Di based on the update log of the extracted data Di (step S1104).

Next, the server 201 determines whether or not the received connection request R is a connection request R1 for stateful communication (step S1105). When stateful communication connection request R1 (step S1105: Yes), the server 201 updates the frequency Fi of data Di is determined whether less than the threshold value F _th (step S1106).

Here, when the update frequency Fi of the data Di is equal to or greater than the threshold F _th (step S1106: No), the server 201 transmits the data Di to the web browser B (step S1107), and ends the series of processing according to this flowchart. To do. The data Di is stored in the update frequency DB 220.

On the other hand, when the update frequency Fi of the data Di is less than the threshold value F _th (step S1106: Yes), the server 201 transmits a first reconnection instruction to the web browser B (step S1108). Then, the server 201 disconnects the connection with the web browser B (step S1109), and ends the series of processes according to this flowchart.

Further, in step S1105, if the connection request R2 stateless communication (step S1105: No), the server 201 updates the frequency Fi of data Di is determined whether the threshold F _th or more (step S1110).

Here, when the update frequency Fi of the data Di is equal to or greater than the threshold value F _th (step S1110: Yes), the server 201 transmits a second reconnection instruction to the web browser B (step S1111). Then, the server 201 disconnects the connection with the web browser B (step S1112), and ends the series of processes according to this flowchart.

Further, in step S1110, if the update frequency Fi of data Di is less than the threshold F _th (Step S1110: No), the server 201 transmits the data Di to the web browser B (step S1113). Then, the server 201 disconnects the connection with the web browser B (step S1114), and ends the series of processes according to this flowchart.

  Thereby, the communication method with the web browser B of the client apparatus 202 can be changed according to the update frequency Fi of the data Di requested from the web browser B of the client apparatus 202.

  In the above description, each time the connection request R is received from the web browser B, the update frequency Fi of the data Di is calculated. However, the present invention is not limited to this. Specifically, for example, the server 201 executes processing for calculating the update frequency Fi of each data Di stored in the update frequency DB 220 periodically (for example, every hour, every day, etc.). It may be.

  In this case, the server 201 can omit the processes in steps S1103 and S1104. Further, the server 201 can specify the update frequency Fi of the data Di with reference to the update frequency DB 220 in step S1106 and step S1110.

(Communication processing procedure of client device 202)
Next, a communication processing procedure of the client device 202 according to the first embodiment will be described. Here, it is assumed that the communication change program P (see FIG. 9) has been transmitted from the server 201 to the client device 202.

  FIG. 12 is a flowchart of an example of a communication processing procedure of the client apparatus 202 according to the first embodiment. In the flowchart of FIG. 12, first, the web browser B of the client device 202 transmits a connection request R to the server 201 (step S1201).

  Next, the web browser B determines whether or not the data Di has been received from the server 201 (step S1202). Here, when the web browser B receives the data Di (step S1202: Yes), the web browser B displays the data Di on the display 407 (step S1203), and ends a series of processes according to the flowchart.

  On the other hand, if the web browser B has not received the data Di from the server 201 (step S1202: No), the web browser B determines whether a first reconnection instruction has been received (step S1204). Here, when the web browser B receives the first reconnection instruction (step S1204: Yes), the web browser B changes the communication method with the server 201 from stateful communication to stateless communication (step S1205). Terminate the process.

  Specifically, for example, in step S1205, the stateful communication with the server 201 is terminated by the web browser B. Then, after the reconnection time T has elapsed, a connection request R2 for stateless communication is transmitted to the server 201, and a series of processes according to the above-described flowchart is repeated.

  In step S1204, when the first reconnection instruction has not been received (step S1204: No), the web browser B determines whether the second reconnection instruction has been received (step S1206). Here, if the web browser B has not received the second reconnection instruction (step S1206: No), the process returns to step S1202.

  On the other hand, when the web browser B receives the second reconnection instruction (step S1206: Yes), the web browser B changes the communication method with the server 201 from stateless communication to stateful communication (step S1207), and the series of flowcharts shown in FIG. The process ends.

  Specifically, for example, in step S1207, the web browser B ends the stateless communication with the server 201 at the reconnection time T interval. Then, a connection request R1 for stateful communication is transmitted to the server 201, and a series of processes according to the above-described flowchart is repeated.

  Thereby, the communication method with the server 201 can be changed according to the update frequency Fi of the data Di requested to the server 201.

As described above, according to the server 201 according to the first embodiment, whether or not the update frequency Fi of the data Di requested from the web browser B is less than the threshold F _th during connection with the web browser B by stateful communication. Can be determined. As a result, it is possible to determine whether or not there is a need to maintain a connection state with the web browser B being connected by stateful communication.

Further, according to the server 201, when the update frequency Fi of the data Di requested from the web browser B connected by stateful communication is less than the threshold F _th , the first reconnection instruction is transmitted to the web browser B, The connection with the web browser B can be disconnected. Thereby, the communication format with the web browser B with low necessity of maintaining a connection state with the server 201 can be changed from stateful communication to stateless communication.

Further, according to the server 201, as a result of transmitting the first reconnection instruction to the web browser B, it is determined whether or not the update frequency Fi of the data Di requested from the web browser B connected by stateless communication is less than the threshold value _Fth. Can be determined. Thereby, it is possible to determine whether or not it is necessary to maintain the connection state with the web browser B being connected by stateless communication.

Further, according to the server 201, when the update frequency Fi of the data Di requested from the web browser B connected by stateless communication is equal to or higher than the threshold value _Fth , the second reconnection instruction may be transmitted to the web browser B. it can. Thereby, it is possible to change the communication format with the web browser B whose necessity of maintaining the connection state with the server 201 is increased from stateless communication to stateful communication.

Further, the server 201 calculates the update frequency Fi of the data Di based on the update log indicating the update date and time of the data Di, and determines whether or not the calculated update frequency Fi of the data Di is less than the threshold value F _th. can do. Accordingly, it is possible to determine whether or not it is necessary to maintain the connection state with the web browser B by using the update frequency Fi of the data Di that is updated every moment.

  Further, the server 201 calculates the reconnection time T until the client device 202 makes the connection request R2 for the stateless communication based on the update log indicating the update date and time of the data Di, and the first reconnection instruction Or the communication change program P. Thereby, the timing at which the web browser B transmits the connection request R2 for stateless communication can be controlled.

(Embodiment 2)
Next, the server 201 according to the second embodiment will be described. Due to the characteristics of the data Di, the update frequency Fi of the data Di in a specific period (for example, a specific time zone) may be higher than the update frequency Fi of the data Di in other periods.

  Therefore, in the second embodiment, a case will be described in which the communication method between the server 201 and the web browser B is changed according to the time (for example, time) when the server 201 is connected to the web browser B of the client device 202. Note that description of portions similar to those described in the first embodiment is omitted.

(Storage contents of switching period table 1300)
First, the contents stored in the switching period table 1300 used by the server 201 will be described. The switching period table 1300 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 13 is an explanatory diagram of an example of the contents stored in the switching period table 1300. In FIG. 13, the switching period table 1300 includes fields for data name, URL, and switching period. By setting information in each field, switching period information 1300-1 to 1300-n of data D1 to Dn is stored as a record.

  Here, the data name is a name that uniquely identifies the data D. The URL indicates the storage location of the data D. The switching period represents a period during which the communication method between the server 201 and the web browser B of the client device 202 is changed from stateful communication to stateless communication.

  For example, the switching period information 1300-1 represents the data name “D1” and the URL “/ dataD1 /” of the data D1. Note that the switching period of the data D1 is not set (“−” in FIG. 13). Further, for example, the switching period information 1300-2 represents the data name “D2” of the data D2, the URL “/ dataD2 /”, and the switching period “11: 00-12: 00”.

(Storage contents of update log table 600)
Next, the storage contents of the update log table 600 used by the server 201 will be described. The fields of the update log table 600 are the same as the fields of the update log table 600 shown in FIG.

  FIG. 14 is an explanatory diagram (part 2) of an example of the stored contents of the update log table 600. In FIG. 14, the update log table 600 stores update logs 1400-1 to 1400-19 as records. For example, the update log 1400-1 indicates the update date and time “2012/3/20 19:00:00” and the update interval “0” of the data D1. Further, for example, the update log 1400-2 indicates the update date and time “2012/3/20 19:00:05” and the update interval “5” of the data D1.

  In the following description, a plurality of periods obtained by dividing the time axis representing the update date and time of the update log table 600 by unit time (for example, 30 [minutes], 1 [hours], 1 [days], etc.) are expressed as “periods p1 to pm”. ", And an arbitrary period among the periods p1 to pm may be expressed as" period pj ". In addition, a specific period during which the communication method with the client device 202 is changed from stateful communication to stateless communication may be referred to as “switching period CP”.

(Example of functional configuration of server 201)
Next, a functional configuration example of the server 201 according to the second embodiment will be described. FIG. 15 is a block diagram of a functional configuration example of the server 201 according to the second embodiment. In FIG. 15, the server 201 is configured to include a reception unit 801, a connection unit 802, a calculation unit 803, a determination unit 804, an instruction unit 805, a disconnection unit 806, and a specification unit 1501. The receiving unit 801 to the cutting unit 806 and the specifying unit 1501 are functions serving as control units. Specifically, for example, a program stored in a storage device such as the ROM 302, the RAM 303, and the magnetic disk 306 illustrated in FIG. The function is realized by executing the function or by the I / F 304. The processing result of each functional unit is stored in a storage device such as the RAM 303 and the magnetic disk 306, for example.

  Hereinafter, processing contents of functional units different from the functional units of the server 201 according to the first embodiment among the functional units of the server 201 according to the second embodiment will be described.

  The specifying unit 1501 specifies a switching period CP for changing the communication method with the client device 202 to stateless communication based on the update date and time when the data Di requested from the client device 202 connected by stateful communication is updated. Have

  Specifically, for example, the identifying unit 1501 first selects the period pj from the periods p1 to pm obtained by dividing the time axis representing the update date and time of the update log table 600 by unit time. Next, the specifying unit 1501 extracts an update log of the data Di for the period pj from the update log table 600. Then, the specifying unit 1501 calculates the average update interval tj of the data Di in the period pj based on the extracted update log of the data Di.

Next, the specifying unit 1501 calculates the update frequency Fi (j) of the data Di in the period pj by obtaining the reciprocal of the calculated average update interval tj. When the calculated update frequency Fi (j) of the data Di is less than the threshold value F _th , the specifying unit 1501 specifies the period pj as the switching period CP. Note that the specifying unit 1501 repeats the above-described processing until there is no unselected period that is not selected from the periods p1 to pm, for example.

  Thereby, the period with low necessity of maintaining the connection state of the server 201 and the web browser B can be specified as the switching period CP. The specified switching period CP of the data Di is stored in, for example, the switching period table 1300 illustrated in FIG. A specific example of the switching period CP of the data Di will be described later.

  The determination unit 804 has a function of determining whether the time point G during connection with the client device 202 is within the switching period CP of the data Di specified by the specifying unit 1501. Here, the time point G may be, for example, the time point when the connection processing with the web browser B that has received the connection request R1 or the connection request R2 is completed, and the connection request R1 or the connection request R2 is sent from the web browser B. It may be the time of acceptance.

  Specifically, for example, whether the determination unit 804 refers to the switching period table 1300 and the time point G during connection with the web browser B of the client device 202 by stateful communication or stateless communication is within the switching period CP of the data Di. It may be determined whether or not.

  In addition, the determination unit 804, for example, when the current time point G becomes a specific time point, the time point G is within the switching period CP of the data Di requested from the web browser B connected by stateful communication or stateless communication. It may be determined whether or not. The specific time point can be arbitrarily set. For example, the specific time point may be set to the start time of each time zone such as 12:00, 13:00.

  The instruction unit 805 has a function of transmitting a reconnection instruction to the client device 202 based on a determination result of whether or not the time point G during connection with the client device 202 is within the data Di switching period CP. Specifically, for example, when the point G during connection with the web browser B in the stateful communication is within the switching period CP, the instruction unit 805 transmits a first reconnection instruction to the web browser B. At this time, the instruction unit 805 may set the reconnection time T as the time from the time point G to the end point of the switching period CP.

  As a result, when the point in time G during connection with the web browser B in the stateful communication is within the switching period CP where the necessity of maintaining the connection state with the web browser B is low, the communication format with the web browser B is changed to the stateful communication. Can be changed to stateless communication.

  In addition, for example, when the point G during connection with the web browser B in stateless communication is outside the switching period CP, the instruction unit 805 may transmit the second reconnection instruction to the web browser B. As a result, when the point G during connection with the web browser B in the stateless communication is outside the switching period CP, the communication format with the web browser B can be changed from stateless communication to stateful communication.

(Specific example of switching period CP of data Di)
Here, a specific example of the switching period CP of the data D1 will be described by taking the stored contents of the update log table 600 shown in FIG. 14 as an example. Here, the threshold value F _th of the update frequency Fi is “F _th = 1/1800”. Further, an example will be described in which the time axis representing the update date and time of the update log table 600 is divided from 19:00:20 to 20:30:30 in units of 30 minutes. In this case, the periods p1 to pm are “periods p1 to p3”.

  First, the identifying unit 1501 selects the period p1 from the periods p1 to p3. Next, the identifying unit 1501 extracts update logs 1400-1, 1400-2, 1400-4, 1400-5, 1400-7 to 1400-12 of the data D1 in the period p1 from the update log table 600. . Then, the specifying unit 1501 calculates an average update interval t1 of the data D1 in the period p1 based on the extracted update log of the data D1. The average update interval t1 is as follows.

t1 = (0 + 5 + 295 + 30 + 90 + 60 + 80 + 40 + 120 + 180) / 10
= 90

  Next, the specifying unit 1501 calculates the update frequency F1 (1) of the data D1 in the period p1 by obtaining the reciprocal of the average update interval t1. The update frequency F1 (1) is as follows.

    F1 (1) = 1/90

If the update frequency F1 (1) of the data D1 is less than the threshold value _Fth , the period p1 is specified as the switching period CP. Here, since the update frequency F1 (1) is _{equal to} or greater than the threshold value _Fth , the specifying unit 1501 does not specify the period p1 as the switching period CP.

  Next, the specifying unit 1501 selects the period p2 from the periods p1 to p3. Then, the specifying unit 1501 extracts the update log 1400-13 of the data D1 in the period p2 from the update log table 600. Next, the specifying unit 1501 calculates an average update interval t2 of the data D1 in the period p2 based on the extracted update log of the data D1. The average update interval t2 is as follows.

    t2 = (2400) / 1 = 2400

  Next, the specifying unit 1501 calculates the update frequency F1 (2) of the data D1 in the period p2 by obtaining the reciprocal of the average update interval t2. The update frequency F1 (2) is as follows.

    F1 (2) = 1/2400

When the update frequency F1 (2) of the data D1 is less than the threshold value _Fth , the period p2 is specified as the switching period CP. Here, since the update frequency F1 (2) is less than the threshold value _Fth , the specifying unit 1501 specifies the period p2 as the switching period CP.

  Next, the specifying unit 1501 selects the period p3 from the periods p1 to p3. Then, the specifying unit 1501 extracts the update log of the data D1 in the period p3 from the update log table 600. Here, since there is no update log of the data D1 in the period p3, it is not extracted. In this case, the specifying unit 1501 sets the update frequency F1 (3) of the data D1 in the period p3 to “F1 (3) = 0”.

The identifying unit 1501, the update frequency F1 (3) of the data D1 of less than the threshold F _th, identifies the period p3 as switching period CP. Here, since the update frequency F1 (3) is less than the threshold value _Fth , the specifying unit 1501 specifies the period p3 as the switching period CP.

Thus, by calculating the update frequency Fi (j) of the data Di per time pj, is possible to identify the period pj update frequency Fi (j) is less than the threshold F _th as switching period CP data Di it can.

  In the above description, the switching period CP of the data Di is calculated based on the update log stored in the update log table 600. However, the present invention is not limited to this. For example, some data Di has a predetermined time zone in which the data Di is updated.

  Specifically, for example, the stock price has a fixed time zone for trading in the stock market in each country, and the non-updated time zone is determined for each country. For this reason, the switching period CP may be set in advance in the switching period table 1300 for data Di representing a real-time chart of stock prices. As a result, the server 201 can handle, for example, stock prices in countries with different trading time zones, and the timing at which the user accesses the server 201 is shifted, so that the resources of the server 201 can be efficiently utilized.

(Various processing procedures of the server 201)
Next, various processing procedures of the server 201 according to the second embodiment will be described. First, the switching period calculation processing procedure of the server 201 will be described. The switching period calculation process is a process for calculating the switching period CP of the data Di. The switching period calculation process is periodically executed, for example, at a preset time.

  FIG. 16 is a flowchart of an example of a switching period calculation process procedure of the server 201 according to the second embodiment. In the flowchart of FIG. 16, first, the server 201 divides the time axis representing the update date and time of the update log table 600 into unit periods and divides it into periods p1 to pm (step S1601).

  Next, the server 201 sets “j” of the period pj to “j = 1” (step S1602), and selects the period pj from the periods p1 to pm (step S1603). Then, the server 201 sets “i” of the data Di to “i = 1” (step S1604), and selects the data Di from the data D1 to Dn (step S1605).

  Next, the server 201 extracts an update log of the data Di for the period pj from the update log table 600 (step S1606). Then, the server 201 calculates the average update interval tj of the data Di in the period pj based on the extracted update log of the data Di (step S1607).

Next, the server 201 calculates the update frequency Fi (j) of the data Di in the period pj by obtaining the reciprocal of the calculated average update interval tj (step S1608). Then, the server 201 calculates the period pj data Di update frequency Fi (j) to determine whether less than the threshold F _th (step S1609).

Here, if the period pj data Di update frequency Fi (j) is equal to or greater than the threshold F _th (Step S1609: No), the server 201 proceeds to step S1612. On the other hand, if the period pj data Di update frequency Fi (j) is less than the threshold F _th (Step S1609: Yes), the server 201 identifies the period pj as switching period CP data Di (step S1610).

  Then, the server 201 registers the period pj specified as the switching period CP of the data Di in the switching period table 1300 (step S1611). Next, the server 201 increments “i” of the data Di (step S1612), and determines whether “i” is greater than “n” (step S1613).

  If “i” is equal to or less than “n” (step S1613: NO), the server 201 returns to step S1605. On the other hand, when “i” is larger than “n” (step S1613: Yes), the server 201 increments “j” of the period pj (step S1614), and whether “j” becomes larger than “m”. Is determined (step S1615).

  If “j” is equal to or less than “m” (step S1615: No), the server 201 returns to step S1603. On the other hand, when “j” is larger than “m” (step S1615: Yes), the server 201 ends the series of processes according to this flowchart.

  Thereby, the period pj in which the necessity of maintaining the connection state between the server 201 and the web browser B is low can be specified as the data Di switching period CP.

  Next, the communication control processing procedure of the server 201 will be described.

  FIG. 17 is a flowchart of an example of a communication control processing procedure of the server 201 according to the second embodiment. In the flowchart of FIG. 17, first, the server 201 determines whether or not a connection request R has been received from the web browser B of the client device 202 (step S1701).

  Here, the server 201 waits to receive a connection request R from the web browser B (step S1701: No). When the connection request R is received from the web browser B (step S1701: Yes), the server 201 connects to the web browser B (step S1702).

  Next, the server 201 determines whether or not the received connection request R is a connection request R1 for stateful communication (step S1703). In the case of the connection request R1 for stateful communication (step S1703: Yes), the server 201 refers to the switching period table 1300 and determines whether or not the current time point G is within the switching period CP of the data Di (step). S1704).

  If the current time point G is outside the switching period CP (step S1704: NO), the server 201 transmits the data Di to the web browser B (step S1705), and ends the series of processing according to this flowchart. The data Di is stored in the update frequency DB 220.

  On the other hand, when the current time point G is within the switching period CP (step S1704: Yes), the server 201 transmits a first reconnection instruction to the web browser B (step S1706). Then, the server 201 disconnects the connection with the web browser B (step S1707), and ends the series of processes according to this flowchart.

  In step S1703, in the case of the connection request R2 for stateless communication (step S1703: No), the server 201 refers to the switching period table 1300 to determine whether or not the current time point G is outside the switching period CP of the data Di. Determination is made (step S1708).

  If the current time point G is outside the switching period CP (step S1708: YES), the server 201 transmits a second reconnection instruction to the web browser B (step S1709). Then, the server 201 disconnects the connection with the web browser B (step S1710), and ends the series of processes according to this flowchart.

  In step S1708, when the current time point G is within the switching period CP (step S1708: No), the server 201 transmits data Di to the web browser B (step S1711). Then, the server 201 disconnects the connection with the web browser B (step S1712), and ends the series of processes according to this flowchart.

  Thus, the communication method between the server 201 and the web browser B of the client device 202 is changed according to whether or not the current time point G during connection with the web browser B of the client device 202 is within the data Di switching period CP. be able to.

  Note that the communication processing procedure of the client device 202 is the same as the communication processing procedure of the client device 202 shown in FIG.

As described above, according to the server 201 according to the second embodiment, Fi (j) of the data Di is the threshold value F from the periods p1 to pm based on the update log indicating the update date and time of the data Di. _A period pj that is less than _th can be specified. The periods p1 to pm are a plurality of periods obtained by dividing the time axis representing the update date and time of the data Di by unit time. Thereby, it is possible to specify the switching period CP that is less necessary to maintain the connection state between the server 201 and the web browser B.

  Further, according to the server 201, it is determined whether or not the time point G being connected to the web browser B by stateful communication is within the switching period CP. If the time point G is within the switching period CP, the first reconnection instruction is sent to the web browser B. Can be sent to. As a result, when the point in time G during connection with the web browser B in the stateful communication is within the switching period CP where the necessity of maintaining the connection state with the web browser B is low, the communication format with the web browser B is changed to the stateful communication. Can be changed to stateless communication. In addition, by specifying the switching period CP of the data Di in advance, the processing load on the server 201 when determining the necessity of maintaining the connection state for each web browser B is reduced, and the response to the web browser B Performance can be improved.

  Further, according to the server 201, as a result of transmitting the first reconnection instruction, it is determined whether or not the point G when the connection request R2 for stateless communication is received from the web browser B is within the switching period CP. In this case, the second reconnection instruction can be transmitted to the web browser B. As a result, when the point G during connection with the web browser B in the stateless communication is outside the switching period CP, the communication format with the web browser B can be changed from stateless communication to stateful communication.

(Embodiment 3)
Next, the server 201 according to the third embodiment will be described. In the third embodiment, when the number of client devices 202 connected to the server 201 reaches a predetermined number or more, a communication control process is executed to change the communication format with the client device 202 connected by stateful communication to stateless communication. The case where it does is demonstrated. In the third embodiment, a case where the information providing system 200 is applied to a service that provides a user with a seating situation in a store such as a restaurant will be described. Note that description of parts similar to those described in the first and second embodiments is omitted.

(Store contents of store information management table 1800)
First, the contents stored in the store information management table 1800 used by the server 201 will be described. The store information management table 1800 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 18 is an explanatory diagram showing an example of the stored contents of the store information management table 1800. In FIG. 18, the store information management table 1800 has fields of store name, total number of seats, and data name. By setting information in each field, store information 1800-1 to 1800-3 for each store A, B, and C is stored as a record.

  Here, the store name is a name that uniquely identifies the store. The total number of seats is the total number of seats installed in the store. The data name is the name of the data Di representing the seat status of the store. The data Di representing the seat status of the store may be, for example, information indicating whether or not there is a vacant seat in the store, or may be information indicating the number of seats in the store.

  The store information 1800-1 represents the total seat number “10” and the data name “D1” of the store A. The store information 1800-2 represents the total seat number “15” and the data name “D2” of the store B. The store information 1800-3 represents the total seat number “20” and the data name “D3” of the store C.

(Store contents of the store status management table 1900)
Next, the storage contents of the store status management table 1900 used by the server 201 will be described. The store status management table 1900 is realized by a storage device such as the RAM 303 and the magnetic disk 306 shown in FIG.

  FIG. 19 is an explanatory diagram showing an example of the contents stored in the store status management table 1900. In FIG. 19, the store status management table 1900 has fields of store name, number of seats and number of reservations. By setting information in each field, store status information 1900-1 to 1900-3 for each store A, B, C is stored as a record.

  Here, the store name is a name that uniquely identifies the store. The number of seats is the number of seats seated by customers among the seats installed in the store. The number of reservations is the number of seats reserved for customers among the seats installed in the store.

  The store status information 1900-1 represents the number of seats “7” and the number of reservations “3” in the store A. The store status information 1900-2 represents the number of seats “15” and the number of reservations “0” in the store B. The store status information 1900-3 represents the number of seats “10” and the number of reservations “0” in the store C.

(Example of management screen)
Next, an example of a management screen displayed on the display 407 of the client device 202 on the store side will be described. Here, a screen example of the management screen of the store C will be described.

  FIG. 20 is an explanatory diagram illustrating a screen example of the management screen. In FIG. 20, a management screen 2000 is a screen for managing the seat status of the store C. On the management screen 2000, a floor map showing the arrangement of the seats S1 to S20 installed in the store C is displayed.

  On the management screen 2000, for example, by clicking on any one of the seats S1 to S20 by a user operation input using the keyboard 408 and the mouse 409 shown in FIG. The attribute of “seat” can be set.

  For example, when a customer who enters the store C sits on the seat S2, the attribute of “sitting” can be set to the seat S2 by clicking on the seat S2 by an operation input of an employee of the store C. . Further, when the seat S1 is reserved by a customer, the attribute of “reserved seat” can be set to the seat S1 by clicking on the seat S1 by an operation input of an employee of the store C.

  Note that the input result of the user operation input performed on the management screen 2000 is uploaded from the client device 202 to the server 201, for example, and the stored contents of the store status management table 1900 shown in FIG. 19 are updated.

  For example, when the attribute of “sitting” is set for a seat in store C, the number of seats in store C in store status management table 1900 is incremented. Further, for example, when the attribute of “sitting” set for a seat at the store C is canceled, the number of seats at the store C in the store status management table 1900 is decremented.

(Storage contents of access log management table 700)
Next, the storage contents of the access log management table 700 used by the server 201 will be described. Each field of the access log management table 700 is the same as each field of the access log management table 700 shown in FIG.

  FIG. 21 is an explanatory diagram (part 2) of an example of the contents stored in the access log management table 700. In FIG. 21, an access log management table 700 stores access logs 2100-1 to 2100-15 as records. For example, the access log 2100-1 indicates the URL “/ dataD1 /” and the access date and time “2012/03/20 18:50:00” of the data D1 accessed by the user U1.

(Example of functional configuration of server 201)
Next, a functional configuration example of the server 201 according to the third embodiment will be described. FIG. 22 is a block diagram of a functional configuration example of the server 201 according to the third embodiment. 22, the server 201 is configured to include a reception unit 801, a connection unit 802, a calculation unit 803, a determination unit 804, an instruction unit 805, a cutting unit 806, and a determination unit 2201. The receiving unit 801 to the cutting unit 806 and the determining unit 2201 are functions serving as control units. Specifically, for example, a program stored in a storage device such as the ROM 302, the RAM 303, and the magnetic disk 306 illustrated in FIG. The function is realized by executing the function or by the I / F 304. The processing result of each functional unit is stored in a storage device such as the RAM 303 and the magnetic disk 306, for example.

  Hereinafter, processing contents of functional units different from the functional units of the server 201 according to the first embodiment among the functional units of the server 201 according to the third embodiment will be described.

The determination unit 2201 has a function of determining whether or not the number N of connected client apparatuses 202 is equal to or greater than a threshold value N _max . Here, the number N of connections may be, for example, the number of connections of the web browser B connected by stateful communication or stateless communication, or may be the number of connections of the web browser B connected by stateful communication. . The number N of connections can be specified from the access log management table 700, for example.

Specifically, for example, the determination unit 2201 refers to the access log management table 700 and determines whether or not the connection number N of the connected web browser B is equal to or greater than a threshold value N _max . Here, the threshold value N _max represents the upper limit value of the number N of connections of the client apparatuses 202 connected to the server 201, and can be arbitrarily set. For example, the threshold value N _max is set based on the number of port numbers of the server 201.

More specifically, for example, the threshold value N _max, once the number of connections N is a threshold value N _max or more, by changing the form of communication with the client device 202 in connection with stateful communication stateless communication, releasing the port number It is set to a value that can be determined to be better. As an example, when the port number of the server 201 is 0 to 65535, the threshold value N _max is set to, for example, “N _max = 30000”.

The transmission unit has a function of transmitting a second reconnection instruction to the client apparatus 202 that is connected by stateful communication when the number of connections N is equal to or greater than the threshold value _Nmax . Specifically, for example, when the number of connections N is equal to or greater than the threshold value N _max , the transmission unit requests the data Di that has the lowest update frequency among the data requested from the client device 202 that is connected by stateful communication. The second reconnection instruction may be transmitted to the client device 202 that becomes.

  More specifically, for example, the transmission unit first refers to the access log management table 700, and requests the data Di having the lowest update frequency among the data requested from the client device 202 connected by stateful communication. The user of the client device 202 is identified. Then, the transmission unit may transmit the second reconnection instruction to the identified user's web browser B.

Further, the determination unit 2201 may determine whether or not the number of connections N after subtracting the number of connections Ni from the number of connections N is equal to or greater than a threshold value N _max . Here, the connection number Ni is the number of connections of the client device 202 that is the request source of the data Di having the lowest update frequency among the data requested from the client device 202 that is connected by stateful communication.

  As a result, the communication format with the web browser B is changed from the stateful communication to the stateless communication in order from the web browser B that accesses the data Di with low update frequency among the data requested from the web browser B that is connected by the stateful communication. Can be made.

In addition, when the number N of connections is greater than or equal to the threshold value N _max , the determination unit 804 determines whether or not the update frequency Fi of the data Di requested from the client device 202 that is connected through stateful communication is less than the threshold value F _th. You may decide. Specifically, for example, the determination unit 804 refers to the update frequency DB 220 to determine whether or not the update frequency Fi of the data Di requested from the web browser B connected by stateful communication is less than the threshold value F _th. . Note that the data Di requested from the client device 202 that is connected by stateful communication can be specified from the URL of the access log management table 700, for example.

In this case, when the update frequency Fi of the data Di is less than the threshold value F _th , the transmission unit instructs the client device 202, which is the request source of the data Di, of the client devices 202 connected by stateful communication to the second reconnection instruction. May be transmitted.

Thereby, when the number of connections N is equal to or greater than the threshold value N _max , the communication format with the web browser B, which is less necessary to maintain the connection state with the server 201, can be changed from stateful communication to stateless communication. .

In addition, when the number of connections N is equal to or greater than the threshold value N _max , the determination unit 804 determines that the update frequency Fi of the data Di that has the lowest update frequency among the data requested from the client device 202 connected by stateful communication is the threshold value F. _It may be determined whether it is less than _th .

  Thereby, the communication format with the web browser B accessing the data Di having the lowest update frequency among the data requested from the web browser B connected by the stateful communication can be changed from the stateful communication to the stateless communication. it can.

(One example of communication control processing)
Here, an example of the communication control processing of the server 201 according to the third embodiment will be described using the access log management table 700 illustrated in FIG. Here, the threshold value N _max is “N _max = 11”. The update frequency F1 of the data D1 is “F1 = 0.5”, the update frequency F2 of the data D2 is “F2 = 0.3”, and the update frequency F3 of the data D3 is “F3 = 0.1”.

First, the determination unit 2201 refers to the access log management table 700 to determine whether or not the number N of connected web browsers B is equal to or greater than a threshold value N _max . In the example of FIG. 21, the connection number N of the connected web browser B is “N = 15”. For this reason, the determination unit 2201 determines that the number N of connections of the connected web browser B is equal to or greater than the threshold value N _max .

  In this case, the transmission unit transmits the second reconnection instruction to the web browser B that is the request source of the data D3 having the lowest update frequency among the data D1 to D3 requested from the web browser connected by the stateful communication. . The web browser B that is the request source of the data D3 is the web browser B of the users U5 and U14.

  Thereby, the communication format with the web browser B which is accessing the data D3 among the web browsers B connected by stateful communication can be changed from stateful communication to stateless communication.

Next, the determination unit 2201 determines whether or not the number N of connections after subtracting the number N3 of connections from the number N of connections is equal to or greater than a threshold value _Nmax . Here, the number N3 of connections is “N3 = 2”, and the number N of connections after subtracting the number N3 of connections from the number N of connections is “N = 13”. For this reason, the determination unit 2201 determines that the number N of connections of the connected web browser B is equal to or greater than the threshold value N _max .

  In this case, the transmission unit transmits the second reconnection instruction to the web browser B that is the request source of the data D2 having the lowest update frequency among the data D1 and D2 requested from the web browser B that is connected by stateful communication. To do. The web browser B that is the request source of the data D2 is the web browser B of the users U4, U7, and U9.

  Thereby, the communication format with the web browser B which is accessing data D2 among the web browsers B currently connected by stateful communication can be changed from stateful communication to stateless communication.

Next, the determination unit 2201 determines whether or not the number N of connections after subtracting the number N2 of connections from the number N of connections is greater than or equal to a threshold value _Nmax . Here, the number N2 of connections is “N2 = 3”, and the number N of connections after subtracting the number N2 of connections from the number N of connections is “N = 10”. For this reason, the determination unit 2201 determines that the number N of connected web browsers B is less than the threshold value N _max .

In this manner, the number of connections N of the web browser B is suppressed to be less than the threshold N _max by sequentially changing the communication format with the web browser B accessing the data Di with low update frequency from stateful communication to stateless communication. be able to.

(Communication control processing procedure of server 201)
Next, a communication control processing procedure of the server 201 according to the third embodiment will be described. First, the first communication control processing procedure for controlling the communication format with the client device 202 of a certain store ST will be described.

  FIG. 23 is a flowchart of an example of a first communication control process procedure of the server 201 according to the third embodiment. In the flowchart of FIG. 23, first, the server 201 determines whether or not a connection request R1 has been received from the web browser B of the client device 202 of the store ST (step S2301).

  Here, the server 201 waits to receive a connection request R1 from the web browser B (step S2301: No). When the connection request R1 is received from the web browser B (step S2301: Yes), the server 201 refers to the store information management table 1800 and specifies the total seat number K of the store ST (step S2302).

  Next, the server 201 refers to the store status management table 1900 and specifies the number of seats k1 and the number of reservations k2 of the store ST (step S2303). Then, the server 201 determines whether or not the value obtained by adding the seating number k1 and the reservation number k2 of the store ST is less than the total seating number K of the store ST (step S2304).

  If the total number of seats in the store ST is less than K (step S2304: Yes), the server 201 connects to the web browser B by stateful communication (step S2305), and the series of processes according to this flowchart is terminated.

  On the other hand, if the total number of seats K in the store ST is greater than or equal to K (step S2304: No), the server 201 determines whether or not the reservation number k2 of the store ST is “k2 = 0” (step S2306). Here, when the reservation number k2 of the store ST is “k2 = 0” (step S2306: Yes), the server 201 is disconnected from the web browser B (step S2307), and the series of processes according to this flowchart ends.

  On the other hand, when the reservation number k2 of the store ST is “k2 ≠ 0” (step S2306: No), the server 201 connects to the web browser B by stateless communication (step S2308), and ends the series of processing according to this flowchart. To do. Specifically, for example, as a result of transmitting the communication change program P to the web browser B, the server 201 connects to the web browser B by stateless communication by transmitting a first reconnection instruction to the web browser B.

  Thereby, according to the seating situation of the store ST, the communication format with the web browser B on the store side can be changed.

  Next, a second communication control processing procedure for controlling the communication format with the client device 202 of a customer at a certain store ST will be described.

  FIG. 24 is a flowchart of an example of a second communication control process procedure of the server 201 according to the third embodiment. In the flowchart of FIG. 24, first, the server 201 determines whether or not the connection request R1 has been received from the web browser B of the client device 202 of the customer of the store ST (step S2401).

  Here, the server 201 waits to receive a connection request R1 from the web browser B (step S2401: No). When the connection request R1 is received from the web browser B (step S2401: Yes), the server 201 refers to the store information management table 1800 and specifies the total seat number K of the store ST (step S2402).

  Next, the server 201 refers to the store status management table 1900 and specifies the number of seats k1 and the number of reservations k2 of the store ST (step S2403). Then, the server 201 determines whether or not the value obtained by adding the seating number k1 of the store ST and the reservation number k2 is less than the total seating number K of the store ST (step S2404).

  Here, if the total number of seats in the store ST is less than K (step S2404: Yes), the server 201 connects to the web browser B by stateful communication (step S2405), and ends the series of processing according to this flowchart.

  On the other hand, if the total number of seats K in the store ST is greater than or equal to K (step S2404: No), the server 201 connects to the web browser B by stateless communication (step S2406), and ends the series of processing according to this flowchart.

  Thereby, according to the seating situation of store ST, a communication format with customer side web browser B can be changed.

Next, a description will be given of a third communication control processing procedure for changing the communication format with the client device 202 connected by stateful communication when the number N of connected client devices 202 is equal to or greater than the threshold value N _max. .

FIG. 25 is a flowchart of an example of a third communication control process procedure of the server 201 according to the third embodiment. In the flowchart of FIG. 25, first, the server 201 determines whether or not the number N of connections of the currently connected client device 202 is equal to or greater than a threshold value N _max (step S2501). Here, the server 201 waits for the number of connections N to be equal to or greater than the threshold value N _max (step S2501: No).

When the number of connections N is equal to or greater than the threshold value N _max (step S2501: Yes), the server 201 sets “i = 1” of the data Di (step S2502) and selects the data Di from the data D1 to Dn ( Step S2503). Then, the server 201 extracts an update log of the data Di from the update log table 600 (step S2504). Then, the server 201 calculates the average update interval t of the data Di based on the extracted update log of the data Di (step S2505).

  Next, the server 201 calculates the update frequency Fi of the data Di by obtaining the reciprocal of the calculated average update interval tj (step S2506). The calculated update frequency Fi of the data Di is stored in the update frequency DB 220, for example.

  Next, the server 201 increments “i” of the data Di (step S2507), and determines whether “i” is greater than “n” (step S2508). If “i” is equal to or smaller than “n” (step S2508: NO), the server 201 returns to step S2503.

  On the other hand, when “i” is larger than “n” (step S2508: Yes), the server 201 refers to the update frequency DB 220 and selects data Di having the lowest update frequency (step S2509). Then, the server 201 refers to the access log management table 700 and identifies the web browser B that is accessing the selected data Di through stateful communication (step S2510).

  Next, the server 201 specifies the number of connections Ni of the specified web browser B (step S2511). Then, the server 201 transmits the communication change program P to the identified web browser B (step S2512). Then, the server 201 disconnects the identified web browser B (step S2513).

Next, the server 201 subtracts the connection number Ni of the web browser B from the connection number N of the connected client device 202 (step S2514), and determines whether or not the connection number N is equal to or greater than a threshold value _Nmax (step S2514). S2515). If the connection number N is equal to or greater than the threshold value N _max (step S2515: YES), the server 201 returns to step S2509 and selects unselected data Di with the lowest update frequency.

On the other hand, if the number of connections N is less than the threshold value N _max (step S2515: No), the server 201 ends the series of processes according to this flowchart.

Thereby, when the number N of connected web browsers B is equal to or greater than the threshold value N _max , communication with the web browser B accessing the data Di by stateful communication in order from the data Di having the lowest update frequency. The format can be changed to stateless communication.

(Relationship between store status and communication format)
FIG. 26 is an explanatory diagram showing the relationship between the store status and the communication format. As shown in FIG. 26, the communication format between the web browser B accessing the data Di of the store ST and the server 201 is changed according to the store status of the store ST.

  For example, when the store status of the store ST is full, the communication format between the server 201 and the web browser B is not connected. Here, full seating is a state in which the sum of the number of seats k1 and the number of reservations k2 in the store ST is equal to or greater than the total number of seats K in the store ST and the number of reservations k2 is “k2 = 0”.

  When the store status of the store ST is vacant (no reservation), the communication format between the server 201 and the web browser B is stateful communication. Here, vacant seats (no reservations) means that the value obtained by adding the number of seats k1 and the number of reservations k2 of the store ST is less than the total number of seats K of the store ST and the number of reservations k2 is “k2 = 0”. .

  When the store status of the store ST is vacant (reserved), the communication format between the server 201 and the web browser B is stateless communication. Here, vacant seats (reserved) means that the value obtained by adding the number of seats k1 and the number of reservations k2 of the store ST is equal to or greater than the total number of seats K of the store ST and the number of reservations k2 is “k2 ≠ 0”. .

(Relationship between store status and communication format of multiple stores)
FIG. 27 is an explanatory diagram showing the relationship between the store status of a plurality of stores and the communication format. As shown in FIG. 27, the web browser B accessing the data D1, D2, D3, D4 of each store A, B, C, D according to the store status of each store A, B, C, D The communication format with the server 201 is changed.

  In this way, when the server 201 handles the store status of a plurality of stores, the usage status of the server 201 network resource differs depending on the store status of each store A, B, C, D, and thus the resources of the server 201 are efficiently used. Can be used.

As described above, according to the server 201 according to the third embodiment, with reference to the access log management table 700, it is determined whether or not the number N of connected web browsers B is equal to or greater than the threshold value _Nmax. can do. Further, according to the server 201, when the number of connections N is equal to or greater than the threshold value N _max , the server 201 becomes the request source of the data Di having the lowest update frequency among the data requested from the web browser B connected by stateful communication. A second reconnection instruction can be transmitted to the web browser B. As a result, when the number of connections N is equal to or greater than the threshold value N _max , the communication format with the web browser B that is least necessary to maintain the connection state with the server 201 can be changed from stateful communication to stateless communication. it can.

Further, according to the server 201, it is possible to determine whether or not the subtracted connection number N is equal to or greater than the threshold _Nmax by subtracting the connection number Ni of the web browser B that has disconnected the stateful communication from the connection number N. . Thereby, the communication format with the web browser B can be changed to the stateless communication in order from the web browser B accessing the data Di having a low update frequency among the data requested from the web browser B connected by the stateful communication. it can.

Further, according to the server 201, when the number of connections N is equal to or greater than the threshold value N _max , the update frequency Fi of the data Di having the lowest update frequency among the data requested from the client device 202 connected by stateful communication is the threshold value. Whether it is less than F _th can be determined.

  As a result, it is possible to access the data Di having the lowest update frequency among the data requested from the web browser B that is connected by stateful communication, and the web browser B that is less required to maintain the connection state with the server 201. The communication format can be changed to stateless communication.

  The communication control method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. The communication control program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The communication control program may be distributed through a network such as the Internet.

  The following additional notes are disclosed with respect to the embodiment described above.

(Supplementary note 1)
The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. Referring to a storage unit that stores information representing the frequency of the data, it is determined whether the update frequency of the data is less than a threshold,
When the update frequency of the data is less than the threshold value, a reconnection instruction for instructing to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed is the client device To
As a result of transmitting the reconnection instruction, the connection with the client device is disconnected.
A communication control method characterized by executing processing.

(Appendix 2) The computer
As a result of transmitting the reconnection instruction, when a connection request in the second communication method is received from the client device, the storage unit is referred to determine whether the data update frequency is less than the threshold value And
When the update frequency of the data is equal to or higher than the threshold, a reconnection instruction that instructs to perform a connection request in the first communication method is transmitted to the client device.
The communication control method according to attachment 1, wherein the process is executed.

(Additional remark 3) The said memory | storage part has memorize | stored the log showing the update date when the said data was updated,
The computer is
Based on a log representing the update date and time of the data stored in the storage unit, a process of specifying a period in which the update frequency of the data is less than a threshold value is executed,
The determination process is as follows:
It is determined whether or not the time point during connection with the client device in the first communication method is within the specified period,
The process to send is
3. The communication control method according to appendix 1 or 2, wherein when it is determined that the time is within the period, a reconnection instruction that instructs to perform a connection request in the second communication method is transmitted to the client device.

(Appendix 4) The computer
As a result of transmitting the reconnection instruction, it is determined whether or not the time point when the connection request in the second communication method is received from the client device is within the period,
If it is determined that it is outside the period, a reconnection instruction is sent to the client device to instruct to make a connection request in the first communication method.
The communication control method according to attachment 3, wherein the process is executed.

(Appendix 5) The computer
With reference to information for identifying the connected client device, it is determined whether the number of connections of the connected client device is equal to or greater than a predetermined value,
When the number of connections of the connected client device is equal to or greater than the predetermined value, it is a request source of data having the lowest update frequency among the data requested from the connected client device, and the first Identify the client device connected with the communication method, execute the process,
The process to send is
The communication control method according to any one of appendices 1 to 4, wherein a reconnection instruction is transmitted to instruct the identified client device to make a connection request in the second communication method.

(Appendix 6) The process of transmitting
The communication control according to any one of appendices 1 to 5, wherein a reconnection instruction that instructs to make a connection request in the second communication method at a predetermined time interval is transmitted to the client device. Method.

(Supplementary note 7)
When the number of connections of the connected client device is equal to or greater than the predetermined value, it is determined whether or not the update frequency of data requested from the client device connected in the first communication method is less than the threshold,
If the update frequency of the data is less than the threshold value, execute a process of identifying a client device that is a request source of the data among client devices connected in the first communication method,
The process to send is
6. The communication control method according to appendix 5, wherein a reconnection instruction is transmitted to instruct the identified client device to make a connection request in the second communication method.

(Additional remark 8) The said memory | storage part has memorize | stored the log showing the update date when the said data was updated,
The computer is
Based on a log representing the update date and time of the data stored in the storage unit, execute a process of calculating the update frequency of the data,
The determination process is as follows:
The communication control method according to any one of appendices 1 to 7, wherein it is determined whether or not the calculated update frequency of the data is less than the threshold value.

(Additional remark 9) The said memory | storage part has memorize | stored the log showing the update date when the said data was updated,
The computer is
When the update frequency of the data is less than the threshold, the client device makes a connection request in the second communication method based on a log indicating the update date and time of the data stored in the storage unit Execute the process to calculate the predetermined time,
The process to send is
The reconnection instruction for instructing the connection request in the second communication method to be performed after the calculated predetermined time has elapsed is transmitted to the client device. Communication control method.

(Appendix 10)
The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. Referring to a storage unit that stores information representing the frequency of the data, it is determined whether the update frequency of the data is less than a threshold,
When the update frequency of the data is less than the threshold value, a reconnection instruction for instructing to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed is the client device To
As a result of transmitting the reconnection instruction, the connection with the client device is disconnected.
A communication control program for executing a process.

(Supplementary note 11)
The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. Referring to a storage unit that stores information representing the frequency of the data, it is determined whether the update frequency of the data is less than a threshold,
When the update frequency of the data is less than the threshold value, a reconnection instruction for instructing to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed is the client device To
As a result of transmitting the reconnection instruction, the connection with the client device is disconnected.
A computer-readable recording medium on which a communication control program for executing processing is recorded.

(Supplementary Note 12) During the connection with the client device in the first communication method in which the data communication to the client device based on the data requested from the client device can be repeated while maintaining the connection state with the client device, A determination unit that determines whether or not the update frequency of the data is less than a threshold with reference to a storage unit that stores information indicating the frequency of data update;
When the determination unit determines that the update frequency of the data is less than the threshold value, it instructs to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed. A transmission unit for transmitting a reconnection instruction to the client device;
As a result of the reconnection instruction being transmitted by the transmission unit, a disconnection unit that disconnects from the client device;
A communication control device comprising:

(Supplementary Note 13) During connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device, A determination unit that determines whether or not the update frequency of the data is less than a threshold with reference to a storage unit that stores information indicating the frequency of data update;
When the determination unit determines that the update frequency of the data is less than the threshold value, it instructs to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed. A transmission unit for transmitting a reconnection instruction to the client device;
As a result of the reconnection instruction being transmitted by the transmission unit, a disconnection unit that disconnects from the client device;
A communication control apparatus comprising: a computer having:

DESCRIPTION OF SYMBOLS 101 Communication control apparatus 102,202 Client apparatus 201 Server 801,1002 Reception part 802 Connection part 803 Calculation part 804 Determination part 805 Instruction part 806 Disconnection part 1001 Request part 1003 Change part 1501 Identification part 2201 Determination part

Claims (8)

Computer
The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. Referring to a storage unit that stores information representing the frequency of the data, it is determined whether the update frequency of the data is less than a threshold,
When the update frequency of the data is less than the threshold value, a reconnection instruction for instructing to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed is the client device To
As a result of transmitting the reconnection instruction, the connection with the client device is disconnected.
A communication control method characterized by executing processing. The computer is
As a result of transmitting the reconnection instruction, when a connection request in the second communication method is received from the client device, the storage unit is referred to determine whether the data update frequency is less than the threshold value And
When the update frequency of the data is equal to or higher than the threshold, a reconnection instruction that instructs to perform a connection request in the first communication method is transmitted to the client device.
The communication control method according to claim 1, wherein the process is executed. The storage unit stores a log representing an update date and time when the data is updated,
The computer is
Based on a log representing the update date and time of the data stored in the storage unit, a process of specifying a period in which the update frequency of the data is less than a threshold value is executed,
The determination process is as follows:
It is determined whether or not the time point during connection with the client device in the first communication method is within the specified period,
The process to send is
3. The communication control method according to claim 1, wherein when it is determined that the period is within the period, a reconnection instruction that instructs to make a connection request in the second communication method is transmitted to the client device. The computer is
As a result of transmitting the reconnection instruction, it is determined whether or not the time point when the connection request in the second communication method is received from the client device is within the period,
If it is determined that it is outside the period, a reconnection instruction is sent to the client device to instruct to make a connection request in the first communication method.
The communication control method according to claim 3, wherein the process is executed. The computer is
With reference to information for identifying the connected client device, it is determined whether the number of connections of the connected client device is equal to or greater than a predetermined value,
When the number of connections of the connected client device is equal to or greater than the predetermined value, it is a request source of data having the lowest update frequency among the data requested from the connected client device, and the first Identify the client device connected with the communication method, execute the process,
The process to send is
5. The communication control method according to claim 1, further comprising: transmitting a reconnection instruction that instructs the specified client device to make a connection request in the second communication method. 6. The process to send is
The communication according to any one of claims 1 to 5, wherein a reconnection instruction for instructing a connection request in the second communication method to be performed at a predetermined time interval is transmitted to the client device. Control method. On the computer,
The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. Referring to a storage unit that stores information representing the frequency of the data, it is determined whether the update frequency of the data is less than a threshold,
When the update frequency of the data is less than the threshold value, a reconnection instruction for instructing to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed is the client device To
As a result of transmitting the reconnection instruction, the connection with the client device is disconnected.
A communication control program for executing a process. The data is updated during connection with the client device in the first communication method in which data communication to the client device based on data requested from the client device can be repeated while maintaining the connection state with the client device. A determination unit that determines whether or not the update frequency of the data is less than a threshold with reference to a storage unit that stores information representing the frequency of
When the determination unit determines that the update frequency of the data is less than the threshold value, it instructs to make a connection request in the second communication method for disconnecting the connection with the client device every time the data communication is performed. A transmission unit for transmitting a reconnection instruction to the client device;
As a result of the reconnection instruction being transmitted by the transmission unit, a disconnection unit that disconnects from the client device;
A communication control device comprising:

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