JP2015200964A - connection control method, server, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform connection control in accordance with priority for each session connection.SOLUTION: In a server client system 1 where one or more of a plurality of ports P1 to Pn are assigned to a plurality of clients 4 and the respective clients 4 can perform session connection with a server 3 via the ports P1 to Pn assigned to self, priory of each of the clients 4 is set for each of the ports P1 to Pn assigned to the respective clients 4. When a start request of new session connection accompanying designation of a port is issued to the server 3 by the clients 4, the priority is determined according to combinations of the clients 4 and requested ports P1 to Pn, and session connection of higher priority is taken precedence over session connection of lower priority.

Description

  The present invention relates to a connection control method, a server, and a program in a server client system in which a server and a plurality of clients perform session connection.

  The server client system is a system in which a plurality of clients communicate with a server, and the server executes processing according to a request received from each client. Since the processing capacity of the server is limited, it is necessary to limit the number of clients that can connect to the server simultaneously.

  Patent Document 1 discloses a connection control method when a connection request is made from a new client to the server in a state where the maximum number of connectable clients are already connected to the server. In this connection control method, the server has a priority table that defines the priority of each client, and a client that newly requests a connection has a higher priority than any of the clients that are already connected. Disconnects the client with the lowest priority and accepts a new client connection request.

JP 2003-016031 A

  The server in the server client system communicates with the client through a plurality of ports, and even with communication with one client, the session is performed through a different port depending on the processing content requested from the client. A connection is made. Even in communication with one client, it is normal that the importance of securing a connection differs for each session connection.

  However, in Patent Document 1, the priority is set for each client, and the priority cannot be set for each session connection (for each port used). Therefore, in order to increase the priority of a session connection having a high degree of importance for a client that performs a plurality of session connections, it is necessary to increase the priority of the client itself. For this reason, the session connection with low importance of the client also has a high priority, and session connections from other clients are restricted.

  The present invention has been made in order to solve the above-described problems. Even if the same client is used, the server processing capability can be effectively improved by performing connection control according to the priority for each session connection. It is intended to be used.

  In order to achieve the above object, a connection control method of the present invention is a connection control method in a server client system in which a server and a plurality of clients perform session connection via a plurality of ports of the server. In this connection control method, one or more ports are assigned to each client, and a session connection priority is set for each combination of client and port. When a request to start a new session connection with one of the ports specified is issued from one of the clients to the server, the server is newly requested from the combination of the requesting client and the specified port. The priority of the determined session connection is determined, and the session connection corresponding to the start request is controlled based on the determined priority.

  In the present invention, since the priority of session connection is set for each combination of client and port, connection control according to the priority for each session connection can be performed even for the same client.

It is explanatory drawing which shows the server client system which concerns on embodiment of this invention. It is explanatory drawing which shows the function structure which a server has. It is explanatory drawing which shows an example of the setting information memorize | stored in the setting file shown in FIG. FIG. 3 is an explanatory diagram illustrating an example of information stored in a client management file illustrated in FIG. 2. FIG. 3 is an explanatory diagram illustrating an example of information stored in a session management table illustrated in FIG. 2. FIG. 3 is an explanatory diagram illustrating an example of information stored in a connection number management table illustrated in FIG. 2. It is a block diagram which shows the hardware constitutions of a server. It is explanatory drawing which shows an example of the information for session connection control stored in the client shown in FIG. It is a flowchart of the connection control process which a server performs. It is a flowchart of the health check process which a server performs.

  A server client system, a connection control method in the server client system, a server, and a program according to an embodiment of the present invention will be described with reference to the drawings.

  A server client system 1 according to the present embodiment includes a server 3 and a plurality of clients 4 connected to a network 2 such as a LAN (Local Area Network) as shown in FIG. The server 3 and each client 4 are information processing apparatuses such as computers.

  The server 3 has a plurality of ports P1 to Pn for communicating with each client 4. Each client 4 is assigned one or more of the ports P1 to Pn, and each client 4 communicates with the server 3 via the ports P1 to Pn assigned to itself.

  As shown in FIG. 2, the server 3 functionally relates to the connection with the client 4, and functionally stores a file storage unit 10 that stores a file that stores setting information of session connection, and session information that indicates the state of the currently connected session And a session information storage unit 20 for storing.

  The file storage unit 10 stores a setting file 11 and a client management file 12.

  The setting file 11 is a file that stores setting information related to session connection. The client 4 is capable of simultaneously connecting to a session with respect to a timeout time (details will be described later) of a health check for checking a communication state and the ports P1 to Pn. The maximum number Cmax is stored.

  FIG. 3 shows an example of information stored in the setting file 11. In this example, the health check timeout period is set to 60 seconds. The port number in the figure is information for uniquely identifying each port P1 to Pn. “Port_1” to “port_n” correspond to the ports P1 to Pn. For example, 40 is set as the maximum number Cmax of the clients 4 that can simultaneously connect to the port P1.

  The client management file 12 shown in FIG. 2 functions as a client management unit together with the connection control unit 40. For each client 4, the ports P1 to Pn assigned to the client 4 and the priority for each port are shown. Stores client management information. Therefore, the client management file 12 functions as a priority setting unit that sets the priority of session connection for each combination of the client 4 and the port.

  FIG. 4 shows an example of client management information stored in the client management file 12. The IP address in the figure is information for uniquely identifying each client 4.

  As shown in the figure, in the client management file 12, one or more ports P1 to Pn (port numbers) are assigned to each client 4. For example, two ports (port numbers: “port_1” and “port_3”) are assigned to the client 4 having the IP address “192.168.1.1.”, And the IP address “192.168.1. 2 ”is assigned three ports (port numbers:“ port_1 ”,“ port_2 ”, and“ port_4 ”).

  The priority indicates the degree to which session connection is prioritized. A session connection with a higher priority value is connected and maintained with priority over other session connections.

  Therefore, for example, when the client 4 having the IP address “192.168.1.1.” Requests to start a session connection via “port_1”, the start request is given priority by the combination. When the client 4 requests to start session connection via “port — 3”, the start request is given priority 3 (second priority). (Priority). Therefore, even for the same client, the priority is different for each port, and the priority is different for each session connection.

  The session information storage unit 20 shown in FIG. 2 stores a session management table 21 and a connection number management table 22.

  The session management table 21 stores records indicating the IP address, port number, and priority of the connection destination client 4 for all session connections that are currently connected.

  FIG. 5 shows an example of session management information stored in the session management table 21. In this example, for example, the client 4 with the IP address “192.168.1.1.” Performs a session connection with the server 3 via “port_1” and “port_3”, and the priority is “1” and “3”.

  The session management table 21 is updated each time a new session connection is started and each time a session connection being connected is disconnected. When a new session connection is started, a record (IP address, port number and priority) in the client management file 12 corresponding to the new session connection is added to the session management table 21, and the session being connected is recorded. Is disconnected, the record corresponding to the disconnected session connection is deleted from the session management table 21.

  In the connection number management table 22 shown in FIG. 2, the number of connected clients for each port number is stored. FIG. 6 shows an example of information stored in the connection number management table 22. In this example, 30 clients 4 are connected to the port having the port number “port_1”. The connection number management table 22 is also updated each time a new session connection is started and each time a session connection being connected is disconnected.

  As shown in FIG. 2, in addition to the file storage unit 10 and the session information storage unit 20, the server 3 includes a data transmission / reception unit 30 that transmits and receives data via a session connection, and a connection control unit 40 that controls session connection. And a health check unit 50 for checking the state of session connection.

  The data transmission / reception unit 30 performs session connection corresponding to each record stored in the session management table 21 (communication via the ports P1 to Pn defined in the record with the client 4 defined in each record). Execute data transmission / reception via The data transmitted and received by the session connection includes a processing request from each client 4 and a response to the request, a health check for detecting a line abnormality, and the response. The data transmitting / receiving unit 30 does not execute the session connection corresponding to the record deleted from the session management table 21.

  When there is a connection request from each client 4 to the server 3, the connection control unit 40 executes connection control processing described later.

  The health check unit 50 includes a timer, transmits a health check request to each client 4 via the data transmission / reception unit 30, and measures the response waiting time. When the health check unit 50 cannot receive a response within the health check time set in the setting file 11, the health check unit 50 determines that the session connection is in an abnormal state, and disconnects the session connection via the connection control unit. .

  As shown in FIG. 7, the server 3 physically includes a control unit 31 that controls the whole, a storage device 32 that stores data, an input unit 33 that inputs data and instructions, a display unit 34 that displays information, The communication unit 35 communicates with the client 4 via the network 2.

  The control unit 31 includes a CPU (Central Processing Unit) 311 that executes a control program, a ROM (Read Only Memory) 312 that stores a basic program, and a RAM (Random Access Memory) 313 that stores various data.

  The CPU 311 reads a program stored in the ROM 312, the RAM 313 and the storage device 32 as necessary, and executes the read program. In addition, the CPU 311 saves data in the RAM 313 and the storage device 32 as necessary for program execution.

The ROM 312 stores a basic program executed by the CPU 311.
The RAM 313 functions as a work area when the CPU 311 executes a program, for example, functions as the session information storage unit 20.

  The control unit 31 provides a function of controlling the operation of the entire server 3 as a whole by the above-described CPU 311, ROM 312, and RAM 313 operating together. Accordingly, the control unit 31 functions as the data transmission / reception unit 30, the connection control unit 40, the health check unit 50, and the like described above.

  The storage device 32 includes a nonvolatile storage device such as a hard disk drive or a flash memory, and stores data necessary for the server 3 to operate. The storage device 32 records, for example, a program executed by the CPU 311 and data referred to when the CPU 311 executes the program, and provides the CPU 311 in response to a request from the CPU 311. The storage device 32 functions as the file storage unit 10 and stores the setting file 11 and the client management file 12.

  The input unit 33 includes a keyboard, a mouse, and the like, receives an input operation by an operator, and transmits the input operation to the control unit 31.

  The display unit 34 includes a liquid crystal display and the like, and displays information to be shown to the operator based on the control by the control unit 31.

  The communication unit 35 is connected to the client 4 via the network 2, establishes a session with the client 4, and performs communication. The communication unit 35 includes ports P1 to Pn. The communication unit 35 functions as the data transmission / reception unit 30, the connection control unit 40, and the health check unit 50 in cooperation with the control unit 31.

  Each client 4 shown in FIG. 1 is a computer device, and its basic configuration is almost the same as the configuration of the server 3 shown in FIG.

  In each client 4, a port to be used for session connection with the server 3 is determined according to the application and the content of the processing. Furthermore, as illustrated in FIG. 4, a priority is assigned to each combination of ports used for connection with the client 4 by the client management file 12. Therefore, the port used for session connection with the server 3 and the priority are determined according to the application of each client 4 and the content of its processing.

FIG. 8 shows an example of assignment of ports and priorities for connection requests of the client 4. This example is an example of the client 4 to which the IP address “192.168.1.2.” Is assigned. As shown in FIG. 8, “port_4” is assigned to the process 1 of the application A, and the client 4 has a combination of the client 4 having the IP address “192.168.1.2.” And “port_4”. Is assigned a priority level 4 (highest) by the client management file 12.
Similarly, “port_2” and priority 1 (lowest) are assigned to process 2 of application A, and “port_1” and priority 2 are assigned to other processes of application A. In addition, “port_2” and priority 3 are assigned to application B regardless of the processing content, and “port — 4” and priority 4 are assigned to application C regardless of the processing content.

  Therefore, the client 4 requests connection to the port P4 having the boat number “port_4” of the server 3 when executing the process 1 of the application A and when executing the application C. Further, when executing the process 2 of the application A, the client 4 requests connection to the port P2 having the boat number “port_2” of the server 3. The client 4 requests connection to the port P1 having the boat number “port_1” of the server 3 when executing other processing of the application A.

  The table shown in FIG. 8 is stored in the main memory of the client 4, for example, and is a port that requests connection when the processor requests a session connection by referring to it when executing some processing or connecting to a server. Is specified.

  Next, the operation of the server client system 1 having the above configuration will be described focusing on the session connection-related operations that are characteristic of the present embodiment.

  When requesting establishment of a session, the client 4 specifies the priority of the requested session connection according to the application being executed and the content of the process, and specifies the port to which that priority is assigned. The client 4 transmits to the server 3 a session establishment request including information indicating its own IP address D1 and the port numbers D2 of the ports P1 to Pn to be connected.

In the server 3, the connection control unit 40 receives a session connection start request.
Then, the connection control unit 40 starts the connection control process shown in FIG. 9, and specifies the IP address D1 and the port number D2 from the received information (step S101).

  Subsequently, the connection control unit 40 searches the record of the session management table 21 for a record that defines the combination of the IP address D1 and the port number D2 specified in step S101 (step S102). It is determined whether it has been found (step S103).

  If the corresponding record is found in step S102 (step S103; Yes), the session via the port number D2 of the IP address D1 is already connected, so the processing is ended as it is.

  When the corresponding record is not found in step S102 (step S103: No), the connection control unit 40 defines the combination of the IP address D1 and the port number D2 specified in step S101 from the record of the client management file 12. A record is searched (step S104), and it is determined whether or not a corresponding record is found by the search (step S105).

  If no corresponding record is found in step S104 (step S105; No), the IP address D1 and the port number D2 specified in step S101 are not objects for which session connection is permitted, so the process is performed without allowing session connection. finish.

  When the corresponding record is found in step S104 (step S105; Yes), the connection control unit 40 extracts the maximum number Cmax and the client number Cnum for the port number D1 from the setting file 11 and the connection number management table 22. (Step S106), it is determined whether Cnum <Cmax (step S107).

  If the determination in step S107 is Yes, there is room for connection, so the connection control unit 40 adds “1” to the client number Cnum of the port number D2 in the connection number management table 22 (step S108), and then The record found in step S104 is added to the session management table 21 (step S109). As a result, the data transmitting / receiving unit 30 starts session connection via the ports P1 to Pn of the port number D2 to the client 4 of the IP address D1.

  When the determination in step S107 is No, the connection control unit 40 extracts a record in which the lowest priority is defined from all the records of the port number D2 in the session management table 21 (step S110).

  If there are a plurality of records in which the lowest priority is defined in step S110, any record selected by some method is extracted from them. The method of selection is arbitrary. For example, it is conceivable that the time when each record is added is recorded in the session management table 21 and the record added at the earliest time is selected from among the records with the lowest priority.

  In subsequent step S111, the priority PR1 defined in the record found in step S102 is compared with the priority PR2 defined in the record extracted in step S110, and it is determined whether PR1> PR2.

  If the determination in step S111 is No, the process ends without permitting the session connection start request received this time.

  If the determination in step S111 is Yes, the record extracted in step S110 is deleted from the session management table 21 (step S112). As a result, the session connection related to the IP address and port number specified in the record is disconnected.

  After step S112, step S109 described above is executed. As a result, the data transmitting / receiving unit 30 starts session connection via the ports P1 to Pn of the port number D2 to the client 4 of the IP address D1.

  By executing step S109, the connection control process ends.

  By executing the connection control process described above, the priority is determined for each session (for each port P1 to Pn of each client 4), and a new start request is dealt with based on the determined priority. Session connection is controlled (connection is allowed or rejected). Furthermore, session connections with high priority are maintained in preference to session connections with low priority.

  The health check unit 50 of the server 3 sequentially checks, for example, periodically or randomly the connection state of each connected session connection.

  When the health check unit 50 starts the health check process illustrated in FIG. 10, first, the health check unit 50 selects a record for health check from the session management table 21 (step S <b> 201). The execution timing of step S201 and the record selection method are arbitrary. For example, when data is received from the client 4 in any of the connected session connections, a record corresponding to the session connection can be selected.

  Subsequently, the IP address D3 and the port number D4 are specified from the record selected in step S201 (step S202).

  Subsequently, the timer built in the health check unit 50 is reset (step S203). In step S204, the data transmission / reception unit 30 sends the health of the client 4 with the IP address D3 via the ports P1 to Pn with the port number D4. A check is transmitted (step S204).

  Thereafter, in step S205, a health check response from the IP address D3 via the port number D4 is waited for the health check time specified in the setting file 11.

  In step S205, it is determined whether a response has been received (step S206). If the response has been received (step S206; Yes), it is determined that the session connection is normal, and thus the health check process is terminated. To do.

  On the other hand, if the response cannot be received in step S205 (step S206; No), it is determined that the communication line is abnormal, so “1” is subtracted from the client number Cnum of the port number D4 in the connection number management table 22 ( In step S207, the record selected in step S201 is deleted from the session management table 21 (step S208), whereby the session connection corresponding to the record selected in step S201 is disconnected.

  By executing the above health check process, it is possible to avoid the limitation of other session connections due to maintaining the connection of a session with a line abnormality.

  As described above, according to the server client system 1 according to the present embodiment, priority is assigned according to the client 4 and the port from which the client 4 has requested connection. Therefore, connection control according to the importance for each session connection is possible, and finer control is possible compared to the case where priority is set for each client 4 unit. Furthermore, in the present embodiment, the priority can be set for each application of the client 4 and further for each process, so that finer connection control is possible.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications can be made within the scope of the claims and within the scope of the equivalent invention.

  For example, each time a new record is added to the session management table 21 by the connection control process shown in FIG. 9, it is possible to additionally execute the health check process shown in FIG. 10 for the added record. is there. The additional health check process can be executed, for example, at a timing between steps S111 and S112 in the flowchart shown in FIG. In this case, if an additional health check process determines that a communication error has occurred, the process after step S112 is not executed, and the process is terminated as it is, so that another session connection is established for connection of a communication error session. Can be avoided (step S112). The additional health check process can also be performed at a timing after step S109.

  In the above embodiment, the session connection priority is set by the combination of the client 4 and the port. However, the priority can be set only by the port.

  For example, all session connections via the port P1 may be set to a priority of 3. In this case, for example, when the port P1 is full, for example, the connection may be transferred to a port to which a lower priority is assigned.

  In the above embodiment, when it is determined in step S107 in FIG. 9 that Cmax = Cnum (step S107; No), the record with the lowest priority is extracted, and the priority is higher than that of the newly requested connection. Disconnected the low session connection and established a session connection for the new request. It is not limited to this, You may employ | adopt another method. For example, the client 4 may be instructed to detect and connect to another available port.

  In the above embodiment, the setting file 11, the client management file 12, the session management table 21, and the connection number management table 22 are used for session control. However, the configuration of the file and table is arbitrary. It is also possible to perform these controls by the program itself without using files or tables.

  In the example of FIG. 8, an example in which the port number and priority of the connection destination of the server 3 are set for each application and for each process. However, if the client 4 knows the port number of the connection destination, It is not necessary to know the priority. However, when the priority is grasped, it is possible to determine and process which application or process is prioritized to perform data communication with the server 3 based on the priority. In this case, for example, when a plurality of processes having the same priority are executed, it is possible to determine that there is urgency and to perform the process with priority given later.

  Further, in the example of FIG. 8, an example in which the port used for session connection and the priority is set for each application and for each process has been shown. However, the present invention is not limited to this method. For example, the assignment method is arbitrary.

  1 server client system, 2 network, 3 server, 4 client, 10 file storage unit, 11 setting file, 12 client management file, 20 session information storage unit, 21 session management table, 22 connection number management table, 30 data transmission / reception unit, 31 control unit, 32 storage device, 33 input unit, 34 display unit, 35 communication unit, 40 connection control unit, 50 health check unit, 311 CPU, 312 ROM, 313 RAM.

Claims (6)

A connection control method in a server client system in which a server and a plurality of clients perform session connection through a plurality of ports of the server,
Each of the clients is assigned one or more of the ports,
The priority of session connection is set for each combination of the client and the port,
When a request for starting a new session connection with any one of the ports is issued from any one of the clients to the server, the server determines from the combination of the requesting client and the designated port. Determining the priority of the newly requested session connection and controlling the session connection corresponding to the start request based on the determined priority;
Connection control method.   The server maintains a session connection with a higher priority in preference to a session connection with a lower priority when connecting a session connection for which a new start request is made. The connection control method according to 1. For each of the ports, the maximum number of clients that can be connected to the session at the same time is set,
The server specifies the port of the client that made the start request when a request for starting a session connection is made from any client through the port to which another client of the maximum number is in session connection. The session connection via the port with the client that made the start request is started on the condition that the assigned priority is higher than any of the priorities specified for the port of the other connected client. In addition, the connection control method according to claim 1 or 2, wherein the session connection via the port with the client having the lowest priority is disconnected.   The connection control method according to claim 1, wherein the server performs a health check for each session connection being connected, and disconnects the session connection in which a communication abnormality is detected. A server for session connection with multiple clients via multiple ports,
For each combination of the client and the port, a client management unit that defines the priority of session connection;
When a request for starting a new session connection with any one of the ports is received from any of the plurality of clients, the newly requested session connection is received from the combination of the client and the designated port. A connection control unit that determines priority from the client management unit, and controls session connection corresponding to the received start request based on the determined priority;
A server comprising A program for causing a computer capable of session connection to another device via a plurality of ports to execute session connection control,
The program is stored in a computer.
Processing for determining the priority of the session connection from the designated port when a request for starting a new session connection accompanied by the designation of the port is received from the client to the computer; and
A process for controlling the session connection corresponding to the received start request based on the determined priority;
A program that executes

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