JP2002229938A - Server for client-server system, client-server system using the server and connection management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control, in a client-server system, the access from a terminal device depending on the state of application execution in the server. SOLUTION: In the client-server system 1, if a connection request message is transmitted from terminal devices 30-1 to 30-n to a proxy server 10 and a custom program is started up, until the data processing is made possible (initialization) after the custom program is started up, a message, that has been transmitted further from the terminal device that has transmitted the connection request message, is temporarily stored, and after the initialization is completed, the stored message is processed by the custom program. Accordingly, in the proxy server 10, before the initialization of the custom program is completed, the message is transmitted from the terminal device, so that a situation that causes a failure in normal processing can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a server for a client / server system that performs access control according to the state of an application in the server, a client / server system using the server, and a connection management method.

[0002]

2. Description of the Related Art In recent years, software developed by Java (hereinafter referred to as "Java application") has been used in client / server systems connected via a network.
When a Java application is used on a client / server system, a Java virtual machine (hereinafter, referred to as “Java VM”) is executed on a terminal device, and a Java servlet is executed on a server.

[0003] JavaVM converts a Java applet (a Java program executed on a Web browser) downloaded from a server into a Java byte code (J).
This is software that converts an ava source code (intermediate format converted for distribution) into a format executable on the platform of each terminal device and executes the converted format. The Java servlet is a modular Java program executed on the server, and builds a Java use environment on the server.

[0004] In the client system, a Java servlet that realizes a specific function is developed and incorporated into the server, whereby the function of the server is appropriately extended.

[0005]

SUMMARY OF THE INVENTION However, Java
a Depending on the servlet, when access is made from a Java applet executed on the terminal device,
Some initialization requires a certain amount of time, such as referring to a database to perform user authentication. Ja like this
For the server running the va servlet,
If an access is made from the terminal device before the initialization of the servlet is completed, a problem may occur in normal processing such as generation of a null pointer in the server.

An object of the present invention is to control access from a terminal device in a client-server system according to the application execution state of a server.

[0007]

According to a first aspect of the present invention, there is provided a client / server configured to transmit and receive data between a server and a terminal device via a network. A server in the system, after starting a predetermined application (for example, “custom program” in the embodiment of the invention),
Until the application becomes capable of processing the received data, a reception proxy unit (for example, the control unit 12 in FIG. 2) for receiving data transmitted to be processed by the application is provided. And

According to a sixth aspect of the present invention, there is provided a connection management method in a client-server system configured to transmit and receive data between a server and a terminal device via a network. After a predetermined application (for example, a “custom program” in the embodiment of the present invention) is started, it is transmitted to be processed by the application until the application can process received data. Receiving agent data receiving step (for example,
It is characterized by including step S30 in FIG.

Further, the invention according to claim 5 provides the invention according to claim 1.
A client-server system characterized by being configured by connecting the server described in any one of the above-mentioned items and a terminal device. According to the first, fifth and sixth aspects of the present invention, the server transmits data from the terminal device before the start (initialization) of the application is completed. Can be prevented.

According to a second aspect of the present invention, in the server according to the first aspect, the receiving agent means receives the received data when the activated predetermined application can process the received data. Is transferred to the application.

According to a seventh aspect of the present invention, there is provided the connection management method according to the sixth aspect, wherein in the receiving proxy step, processing of received data is enabled by the activated predetermined application. Delivering the received data to the application.

According to the second and seventh aspects of the present invention, after the activation (initialization) of the application is completed,
Since the data received is processed by the predetermined application until the received data can be processed, the processing in the standby state can be easily continued. The invention according to claim 3 is the server according to claim 1 or 2, wherein after the predetermined application is started, the application is processed by the application until the application can process received data. A predetermined message (for example, step S10 in FIG. 4) is transmitted to the terminal device which has transmitted the data to be transmitted.
Is characterized by including a message transmitting means for transmitting an error message transmitted to the terminal device.

[0013] The invention according to claim 8 is the connection management method according to claim 6 or 7, wherein after the predetermined application is activated, until the application can process received data. The method further includes a step of displaying a predetermined message (for example, an error message transmitted to the terminal device in step S10 of FIG. 4) on the terminal device that has transmitted data to be processed by the application.

According to the third and eighth aspects of the present invention, the processing status of the server 10 can be notified to the terminal device. The invention according to claim 4 is the invention according to claim 1.
4. The server according to any one of items 1 to 3, wherein the predetermined application is described in Java language.

[0015] The invention according to claim 9 provides the invention according to claims 6 to
8. The connection management method according to any one of items 8, wherein the predetermined application is described in Java language. According to the fourth and ninth aspects of the present invention, it is possible to manage access from a terminal device until the start of a predetermined Java servlet is completed in a client / server system capable of using an application described in Java. it can.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a client / server system according to the present invention. First, the configuration will be described. FIGS. 1 to 5 are diagrams showing a client-server system 1 to which the present invention is applied.

FIG. 1 shows a client / server system 1
1 is a network configuration diagram of FIG. In FIG. 1, a client server system 1 includes a proxy server 10 and a W
eb server 20, and a plurality of n terminal devices 30-1 to 30-30
-N and the network 40. Figure 1
, The terminal devices 30-1 to 30-n are dedicated to the client server system 1, and access the Web server 20 via the proxy server 10. That is, the terminal devices 30-1 to 30-n connect to the proxy server 10 when the power is turned on, and transmit a data transmission request to the Web server 20 to the proxy server 10. Then, the proxy server 10 sets the terminal device 30
Access the Web server 20 on behalf of -1 to 30-n.

FIG. 2 is a block diagram showing a functional configuration of the proxy server 10. 2, the proxy server 10 includes an input unit 11, a control unit 12, a storage unit 13,
RAM (Random Access Memory) 14 and VRAM (Vi
deo Random Access Memory) 15, a display unit 16, and a communication unit 17. The input unit 11 includes a keyboard and a pointing device such as a mouse provided with a cursor key, a number input key, and the like.
Output to 2.

The control unit 12 controls the entire proxy server 10 and reads and executes programs related to various processes stored in the storage unit 13 in accordance with various instruction signals input from the input unit 11. The control unit 12
When a start of a custom program (to be described later) is instructed by the terminal devices 30-1 to 30-n, a custom program start process (to be described later) for starting the custom program or until the start of the custom program is completed. During this period, a connection proxy process (described later) for proxying the connection with the terminal device is executed. Then, the control unit 12 stores the processing results of executing the various programs in a predetermined area of the storage unit 13 or the RAM 14 or causes the display unit 16 to display the processing results.

The storage unit 13 is composed of a nonvolatile semiconductor memory such as a flash ROM. This storage unit 13
It stores a custom program, a program for executing a custom program start-up process, a program for executing a connection proxy process, and a program for various processes for controlling the proxy server 10. Note that the custom program allows a registered user to access data stored in the proxy server 10 from a terminal device,
Java that implements processing performed by the proxy server 10 when a coupon is printed based on this data.
a servlet.

The storage unit 13 stores an initialization completion flag indicating that the initialization of the custom program has been completed when the initialization of the custom program has been completed in the custom program activation process. RAM14
Stores various data, and has a work area 14a for temporarily storing various data generated in various processes executed by the control unit 12.

The VRAM 15 is a video memory for storing display data displayed on the display unit 16. Display 16
Is composed of, for example, a dot matrix type color liquid crystal display cell and a CRT (Cathode Ray Tube).
Various data stored in the AM 15 are displayed.

The communication unit 17 performs data conversion processing on various data instructed by the control unit 12 into a predetermined format and outputs the data to the network 40. Communication unit 1
7 performs a data conversion process on the signal received from the terminal device 30-1 into the original data format, and outputs the signal to the control unit 12. Next, the configuration of the terminal devices 30-1 to 30-n will be described.

Since the configurations of the terminal devices 30-1 to 30-n are the same, the configuration of the terminal device 30-1 will be described below as a representative. The same applies to the description of the operation. FIG. 3 is a block diagram illustrating a functional configuration of the terminal device 30-1. The functional configuration of the terminal device 30-1 is the same as the configuration of the proxy server 10 except for the configuration of the control unit 32-1 and the storage unit 33-1. Therefore, description thereof will be omitted, and only different portions will be described.

The control unit 32-1 controls the entire terminal device 30-1. In accordance with various instruction signals input from the input unit 31-1, programs related to various processes stored in the storage unit 33-1 are stored. Is read and executed. Also,
The control unit 32-1 stores processing results of executing various programs in a predetermined area of the storage unit 33-1 or the RAM 34-1 or causes the display unit 36-1 to display the result. further,
The control unit 32-1 transmits a connection request for starting the custom program to the proxy server 10 according to a predetermined instruction signal input from the input unit 31-1.

The storage unit 33-1 is composed of a nonvolatile semiconductor memory such as a flash ROM. This storage unit 33
-1 stores programs relating to various processes for controlling the terminal device 30-1. Returning to FIG. 1, the Web server 20 is a general Web server, and when receiving a data transmission request from the proxy server 10, transmits the predetermined data to the proxy server 10.

The network 40 is a LAN (Local Area)
Network), the Internet, or the like, and mediates transmission and reception of data between the terminal devices 30-1 to 30-n, the proxy server 10, and the Web server 20. Next, the operation will be described. FIG. 4 is a flowchart illustrating the connection proxy process executed by the control unit 12 of the proxy server 10. The connection proxy process is started when the power of the proxy server 10 is turned on.

In FIG. 4, when the connection proxy process is started, first, the control unit 12 determines whether or not messages (signals) have been received from the terminal devices 30-1 to 30-n via the network 40. A determination is made (step S1). If it is determined in step S1 that no message has been received from the terminal device 30-1 to 30-n, the control unit 12
Repeats step S1. If it is determined in step S <b> 1 that a message has been received from the terminal devices 30-1 to 30-n, the control unit 12 determines that the received message is a connection request message related to the custom program (an instruction signal accompanied by the activation of the custom program). Is determined (step S2).

If it is determined in step S2 that the received message is not a connection request message relating to the custom program, the control unit 12 determines whether the received message is a message for instructing the proxy server 10 to shut down. (Step S3).
If it is determined in step S3 that the received message is a message instructing shutdown of the proxy server 10, the control unit 12 ends the connection proxy process. On the other hand, the received message is
If it is determined that the received message is not a message instructing shutdown, the control unit 12 determines whether or not execution of the custom program related to the received message has been completed (step S4).

If it is determined in step S4 that the execution of the custom program related to the received message has been completed, the control unit 12 proceeds to step S1. If the control unit 12 determines that the execution of the custom program related to the received message has not been completed,
It is determined whether or not the initialization completion flag of the custom program related to the received message is set (step S5).

If it is determined in step S5 that the initialization completion flag of the custom program relating to the received message has been set, the control unit 12 proceeds to step S7. On the other hand, when determining that the initialization completion flag of the custom program related to the received message is not set, the control unit 12 receives the message transmitted from the terminal device for processing by the custom program, and temporarily At the same time, a message indicating that the custom program is being initialized is transmitted to the terminal device that transmitted the message (step S).
6). At this time, in addition to a message indicating that the custom program is being initialized, advertisement information or the like suitable for the user may be transmitted.

Then, the control section 12 proceeds to step S1. If it is determined in step S5 that the initialization completion flag of the custom program related to the received message is set, the control unit 12 receives the message related to the custom program from the terminal device that has transmitted the message, temporarily stores the message. The passed message is passed to the custom program (step S7). And the control unit 1
2 shifts to step S1.

If it is determined in step S2 that the received message is a connection request message related to the custom program, the control unit 12 searches the storage unit 13 for the custom program whose start is instructed in the connection request message (step S8). ). Next, the control unit 1
The terminal 2 determines whether or not the custom program instructed to be activated in the connection request message is stored in the storage unit 13 (step S9). If it is determined that the custom program is not stored, the terminal that transmitted the connection request message An error message indicating that the custom program cannot be executed (for example, a message such as “Processing now” or “Please wait”) is transmitted to the device (step S10). Therefore, the processing status of the proxy server 10 can be notified to the terminal device.

On the other hand, when it is determined that the custom program instructed to be started in the connection request message is stored in the storage unit 13, the control unit 12 reads the custom program into the RAM 14 and executes the custom program start processing. (Step S11). Then, the control unit 12 proceeds to step S1. Next, the custom program activation process will be described.

FIG. 5 shows the control unit 12 of the proxy server 10.
5 is a flowchart showing a custom program activation process executed by the program. The custom program activation process is a process for activating a custom program instructed to be activated in the connection proxy process. In FIG. 5, first, when a start of a custom program is instructed in the connection proxy process, the control unit 12 performs customization according to the content of the connection request message (ID of the transmission source terminal device, user ID, password, etc.). The program is initialized (step S10).

When the initialization is completed, the control unit 12
Stores (sets) the initialization completion flag indicating that the initialization of the custom program is completed in the storage unit 13 (step S20). Next, the control unit 12 processes the message transmitted from the terminal device that transmitted the connection request message by the custom program (Step S3).
0). Then, the control unit 12 ends the custom program activation processing.

As described above, in the client / server system 1 to which the present invention is applied, the terminal device 30-1
When a connection request message is transmitted to the proxy server 10 from ~ to 30-n and the custom program is activated, the period from when the custom program is activated until data processing becomes possible, that is, initialization is performed Until the completion, the message further transmitted from the terminal device that has transmitted the connection request message is temporarily stored, and after the initialization of the custom program is completed, the stored message is processed by the custom program.

Therefore, in the proxy server 10, a message is transmitted (accessed) from the terminal device before the initialization of the custom program (application) is completed, thereby causing a failure in normal processing such as generation of a null pointer. This can prevent the situation from occurring. In addition, after the initialization of the custom program is completed, the stored message is processed,
While the custom program is initialized, the processing that has been in the standby state can be easily continued.

In this embodiment, during initialization of the custom program, the terminal device sends the proxy server 1
0 is stored in the proxy server 10, but the terminal devices 30-1 to 30-n
The stored message may be transmitted from the terminal device to the proxy server by transmitting from the proxy server 10 a message indicating that the initialization of the custom program has been completed to the terminal device.

In the present embodiment, if various processes are realized by an application described in Java, it is less likely to be restricted by a network protocol, a proxy server, and a terminal device platform. Further, it can be realized by a general-purpose programming language, for example, a general-purpose language such as C ++ or Java2. Again, in this case,
The present invention can be implemented without being restricted by the protocol of the network or the platform of the proxy server and the terminal device.

[0041]

According to the first, fifth, and sixth aspects of the present invention, the server transmits data from the terminal device before the start (initialization) of the application is completed. It is possible to prevent a situation in which a failure occurs in normal processing.

According to the second and seventh aspects of the present invention, after the activation (initialization) of the application is completed,
Since the data received is processed by the predetermined application until the received data can be processed, the processing in the standby state can be easily continued. According to the third and eighth aspects of the present invention, it is possible to notify the terminal device of the processing state in the server 10.

According to the fourth and ninth aspects of the present invention, a client-server system capable of using an application described in Java is provided with a predetermined Java
Until the activation of the servlet is completed, access from the terminal device can be managed.

[Brief description of the drawings]

FIG. 1 is a network configuration diagram of a client-server system 1. FIG.

FIG. 2 is a block diagram showing a functional configuration of the proxy server 10.

FIG. 3 is a block diagram illustrating a functional configuration of a terminal device 30-1.

FIG. 4 is a flowchart showing a connection proxy process executed by a control unit 12 of the proxy server 10;

FIG. 5 is a flowchart showing a custom program activation process executed by the control unit 12 of the proxy server 10.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Client-server system 10 Proxy server 11, 21, 31-1 to 31-n Input unit 12, 22, 32-1 to 31-n Control unit 13, 23, 33-1 to 33-n Storage unit 14, 24 , 34-1 to 34-n RAM 14a, 24a, 34a-1 to 34a-n Work area 15, 25, 35-1 to 35-n VRAM 16, 26, 36-1 to 36-n Display unit 20 Web server 30-1 to 30-n terminal device 40 network

Claims (9)

[Claims] 1. A server in a client-server system configured to transmit and receive data between a server and a terminal device via a network, wherein after starting a predetermined application, the application transmits the received data. A server, comprising: a reception proxy unit that receives data transmitted to be processed by the application until processing is possible. 2. The server according to claim 1, wherein the reception proxy means transfers the received data to the application when the received application can be processed by the activated predetermined application. . 3. After the predetermined application is activated, a predetermined period is transmitted to the terminal device that has transmitted data to be processed by the application until the application can process received data. 3. The server according to claim 1, further comprising a message transmitting unit that transmits a message. 4. The predetermined application is a Java application.
4. The server according to claim 1, wherein the server is described in a language. 5. A client-server system comprising the server according to claim 1 and a terminal device connected thereto. 6. A connection management method in a client-server system configured to transmit and receive data between a server and a terminal device via a network, the method comprising the steps of: A connection management method including a reception proxy step of receiving data transmitted to be processed by the application until the reception data can be processed by the application. 7. The method according to claim 7, further comprising the step of, when the activated predetermined application is capable of processing received data, transferring the received data to the application. 6. The connection management method according to 6. 8. The terminal device that has transmitted data to be processed by the application after the predetermined application has been activated and before the application can process received data. 8. The connection management method according to claim 6, further comprising a step of displaying a message. 9. The method according to claim 1, wherein the predetermined application is Java.
9. The connection management method according to claim 6, wherein the connection management method is described in a language.