JP2002229808A - Client server system, server, terminal equipment, and transmission information monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a conflict of processes of an application caused by the duplicated activation of the same application in the terminal equipment of a client server system. SOLUTION: The Java applet activated by the terminal equipment 30-1 through 30-n of the client server system is registered on a terminal information table 13a, and whether the Java applet included in the HTTP(hypertext transfer protocol) message transmitted to the terminal equipment 30-1 through 30-n from a Web server 20 is registered on the terminal information table 13a or not is confirmed. When the Java applet is registered on the terminal information table 13a, the Java applet is not transmitted to the terminal equipment of sendees, and an error message is transmitted, thereby the problem of a conflict of processes caused by the duplicated activation of the same Java applet on one terminal equipment can be solved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a client / server system for monitoring an application transmitted to a terminal device via a network, a server, a terminal device, and a transmission information monitoring 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 J
A Java application is executed by avaVM. This Java application is a Java application.
This is called an applet and is embedded in a home page downloaded from a Web server to a terminal device via a proxy server or the like.

[0003] In addition, JavaVM converts a Java applet downloaded from a Web server from Java bytecode (an intermediate format in which Java source code is converted for distribution) to a format executable on a platform of each terminal device and executes the Java applet. I do. Here, the Java applet is an application executed on a Web browser, and when viewing a homepage on a terminal device, a JavaVM in which a JavaVM is embedded in the homepage.
By executing the Java applet, processing according to each Java applet, such as printing of predetermined contents, is performed.

[0004]

SUMMARY OF THE INVENTION However, Web
In some cases, the same Java applet is embedded in the homepage downloaded from the server due to a mistake of the homepage creator, a bug of the homepage creation software used when creating the homepage, or the like.

In such a case, by downloading and browsing the homepage on the terminal device,
A plurality of the same Java applets are started simultaneously. Then, at this time, processing based on the activated Java applet competes. For example, when a plurality of Java applets for printing specific contents are activated, print data of a plurality of Java applets compete with each other, and data in which these print data overlap is input to the printer. In such a case, there has been a problem that application processing competes, for example, the printer cannot perform appropriate printing. This problem is particularly problematic in systems that do not perform job management.

It is an object of the present invention to prevent contention of application processing due to the same application being repeatedly started in a terminal device of a client-server system.

[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 system of a specific type of application (for example, a Java application transmitted from the proxy server 10 to the terminal device 30-1).
a applet) to the terminal device, and identification information (for example, the control unit 12 in FIG. 2) for identifying that the specific type of application is being executed in the terminal device. For example, a storage unit (for example, information included in the terminal information table 13a in FIG. 3) (for example, the storage unit 13 in FIG. 2) stores a specific type of information detected by the detection unit based on the identification information. A determination unit (for example, the control unit 12 in FIG. 2) that determines whether the application is the same as an application that is being executed in the terminal device; and a specification detected by the detection unit by the determination unit. If it is determined that the type of application and the application running on the terminal device are not the same,
When the application detected by the detection unit is executable on the terminal device, and the application of the specific type detected by the detection unit is determined to be the same as the application being executed on the terminal device, Is characterized by including execution control means (for example, the control unit 12 in FIG. 2) for restricting execution of the application detected by the detection means in the terminal device.

According to a fourth aspect of the present invention, there is provided a server in a client-server system configured to transmit and receive data between a server and a terminal device via a network, wherein a specific type of application is transmitted from the own device. And a detection unit (for example, the control unit 12 in FIG. 2) for detecting that the application of the specific type is being executed in the terminal device. Storage means (for example,
The storage unit 13) of FIG. 2 and a determination to determine whether an application of a specific type detected by the detection unit and an application running on the terminal device are the same based on the identification information. Means (for example,
When the control unit 12) of FIG. 2 and the determination unit determine that the application of the specific type detected by the detection unit and the application running on the terminal device are not the same, the detection unit Transmitting the application detected by the detection unit to the terminal device, and when it is determined that the application of the specific type detected by the detection unit is the same as the application running on the terminal device, And a transmission control unit (for example, the control unit 12 in FIG. 2) that does not transmit the application detected by the unit to the terminal device.

According to a tenth aspect of the present invention, there is provided a transmission information monitoring method in a client-server system configured to transmit and receive data between a server and a terminal device via a network. The server stores the identification information for identifying that the specific type of application (for example, a Java applet transmitted from the proxy server 10 to the terminal device 30-1) is being executed. A detection step (for example, step S8 in FIG. 5) for detecting that is transmitted to the terminal device, a specific type of application detected by the detection means based on the identification information, A determination step of determining whether or not the application being executed is the same ( Eg to the step S10) in FIG. 5,
In the determining step, when it is determined that the application of the specific type detected in the detecting step and the application being executed in the terminal device are not the same, the application detected in the detecting step is converted to the terminal device. And executable
If it is determined that the application of the specific type detected in the detection step is the same as the application being executed in the terminal device, the application detected in the detection step is executed in the terminal device. Execution control step for restricting execution (for example, “Y” processing in step S10 in FIG. 5)
And

[0010] The invention according to claim 8 is a terminal device in a client-server system configured to transmit and receive data between a server and a terminal device via a network. Is completed, an end message (for example, an applet end message transmitted by the terminal device 30-1) indicating the end of the execution of the application is transmitted to a predetermined server.

According to a second aspect of the present invention, in the client-server system according to the first aspect, when the execution of the application being executed on the terminal device is completed, the application is stored in the storage means. An identification information changing unit (for example, the control unit 12 in FIG. 2) for changing the identification information set so as to indicate that the application is not executed.

According to a fifth aspect of the present invention, in the server according to the fourth aspect, when the execution of the application being executed on the terminal device is completed, the identification information stored in the storage means for the application. And an identification information changing unit that changes the application so as to indicate that the application is not executed.

According to an eleventh aspect of the present invention, in the transmission information monitoring method according to the tenth aspect, when the execution of the application being executed in the terminal device is completed, the identification information stored in the application is stored. Is further changed to indicate that the application is not executed (for example, step S7 in FIG. 5).

According to a third aspect of the present invention, there is provided the client / server system according to the first or second aspect,
The specific type of application is characterized in that it is described in Java language. The invention according to claim 7 is the server according to any one of claims 4 to 6, wherein the specific type of application is a Java application.
It is characterized by being described in va language.

The invention according to claim 9 is the terminal device according to claim 8, wherein the specific type of application is:
It is characterized by being described in Java language. According to a twelfth aspect of the present invention, in the transmission information monitoring method according to the tenth or eleventh aspect, the specific type of application is described in a Java language.

[0016] Further, the invention according to claim 6 is based on claim 4.
Or the server according to 5, wherein the determination unit determines that the application of the specific type detected by the detection unit is the same as the application being executed on the terminal device; And an error message transmitting means for transmitting an error message indicating that the specific type of application is not transmitted.

According to the present invention, it is possible to solve the problem that the processing of the application conflicts when the same application is repeatedly started on one terminal device.

[0018]

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 at the time of turning on the power, and transmit a data transmission request to the Web server 20 to the proxy server 10 as necessary. Then, proxy server 1
0 accesses the Web server 20 on behalf of the terminal devices 30-1 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
Means that the terminal devices 30-1 to 30-n
When a homepage or the like including a Java applet is downloaded from the Web server 20 via the web server 20, a transmission information monitoring processing program that determines whether or not the same Java applet is embedded in the downloaded homepage or the like is executed. . At this time, the downloaded home page is HTTP (Hypertext)
Transfer Protocol). Also, an applet end message (described later) transmitted from the terminal devices 30-1 to 30-n to the proxy server 10 is created based on HTTP. Therefore, hereinafter, the downloaded homepage or applet end message is referred to as an “HTTP message” as appropriate.

Further, 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 configured by a nonvolatile semiconductor memory such as a flash ROM. The storage unit 13 stores a transmission information monitoring processing program and programs related to various processes for controlling the proxy server 10. Also, the storage unit 1
3 is the Ja which is currently transmitted to each terminal device and is activated.
Terminal information table 13 for storing va applets
a is stored.

FIG. 3 is a diagram showing a data configuration of the terminal information table 13a. In FIG. 3, the terminal information table 13a stores the IP addresses of the connected terminal devices 30-1 to 30-n and the identifiers of the Java applets currently transmitted and activated in each terminal device. Have been. The identifier of the Java applet stored in the terminal information table 13a is, for example, Java
a is the file name of the applet.

Returning to FIG. 2, the RAM 14 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 includes a display unit 16
Is a video memory for storing the display data displayed by.

The display unit 16 is, for example, a dot matrix type color liquid crystal display cell or a CRT (Cathode Ray Tub).
e) and the like, and displays various data stored in the VRAM 15. 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. Further, the communication unit 17 performs a data conversion process on the signal received from the terminal device 30-1 into the original data format, and
Output to 2.

Next, the configuration of the terminal devices 30-1 to 30-n will be described. Note that the terminal devices 30-1 to 30-n
Are similar to each other, 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. 4 is a block diagram illustrating a functional configuration of the terminal device 30-1.

The functional configuration of the terminal device 30-1 is as follows.
The configuration is the same as that of the proxy server 10 except for the configuration of the 2-1 and the storage unit 33-1. Therefore, the description is omitted, and only different portions will be described. The control unit 32-1 controls the entire terminal device 30-1, reads out programs related to various processes stored in the storage unit 33-1 according to various instruction signals input from the input unit 31-1, and reads the programs. Execute. In addition, the control unit 32-1 performs the proxy server 1 download to download the homepage as necessary.
0, an information transmission request to the Web server 20 is transmitted. Further, the control unit 32-1 controls the running Java.
When the execution of the applet ends, an applet end message indicating that the execution of the Java applet has ended is transmitted to the proxy server. And the control unit 32
-1 indicates a processing result of executing various programs in the storage unit 3
3-1 or a predetermined area of the RAM 34-1 or display on the display unit 36-1.

The storage unit 33-1 is constituted by a nonvolatile semiconductor memory such as a flash ROM. This storage unit 33
-1 is the downloaded HTTP message, its H
The Java applet embedded in the TTP message and programs related to various processes for controlling the terminal device 30-1 are stored. Returning to FIG. 1, Web server 2
0 is a general Web server, and the proxy server 1
When an information transmission request is received from the terminal devices 30-1 to 30-n via the "0", predetermined data such as data relating to a homepage indicated in the information transmission request is transmitted to the proxy server 10.

The network 40 has 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. 5 is a flowchart showing the transmission information monitoring process executed by the control unit 12 of the proxy server 10. The transmission information monitoring process
Terminal devices 30-1 to 30- through proxy server 10
n to determine whether a plurality of the same Java applets are embedded in the homepage transmitted to the same
When a plurality of Java applets are embedded, the process is for transmitting only one Java applet to the terminal device.

In FIG. 5, first, the control unit 12
It is in a reception standby state for the TTP message (step S
1). Next, the control unit 12 receives the HTTP message (Step S2), and determines whether or not the received message is an HTTP message (homepage) transmitted from the Web server 20 to the terminal device (Step S3). ).

In step S3, the received message is transmitted to the terminal device transmitted from the Web server 20 to the terminal device.
If it is determined that the message is not a TP message, the control unit 12
It is determined whether or not the received message is an applet end message (step S4). If it is determined that the received message is not an applet end message, the received message is transmitted to the transmission destination because the message is not a message monitored by the proxy server 10 (step S5). And the control unit 12
Moves to step S1.

On the other hand, if it is determined in step S4 that the received message is an applet end message, the terminal information table 13a is searched by referring to the IP address and applet identifier included in the applet end message (step S6). Next, the control unit 1
2 deletes the searched applet identifier from the terminal information table 13a and deletes the registration (step S7).
Then, the control unit 12 proceeds to step S1.

In step S3, the Web server 20
If the control unit 12 determines that the received message is an HTTP message (homepage) transmitted to the terminal device, the control unit 12 determines whether a Java applet is embedded in the received message (step S8). Then, when determining that the Java applet is not embedded in the received message, the control unit 15 proceeds to step S5. On the other hand, when determining that the Java applet is embedded in the received message, the control unit 12 refers to the IP address included in the received message and searches for the IP address in the terminal information table 13a (step S9). .

Next, the control unit 12 determines whether or not the same applet identifier as the applet identifier included in the received message has already been registered as the applet identifier corresponding to the IP address in the terminal information table 13a. (Step S10). In step S10, when it is determined that the same applet identifier as the applet identifier included in the received message is already registered as the applet identifier corresponding to the IP address in the terminal information table 13a, the control unit 12
Since the Java applet already running on the terminal device is transmitted again and is about to be started,
The HTTP message is not transmitted to the destination terminal device, but an error message is transmitted indicating that transmission of the Java applet is impossible because the same applet is about to be started in duplicate (step S11).

If it is determined in step S10 that the same applet identifier as the applet identifier included in the received message is not registered as the applet identifier corresponding to the IP address in the terminal information table 13a, the control unit 12 Newly launched Java
Since it is an applet, the applet identifier included in the received message is stored and registered in association with the IP address in the terminal information table 13a (step S12). Then, the control unit 12 proceeds to step S5.

After this, the control unit 12 returns to step S
Steps 1 to S12 are repeated, and when the power of the proxy server 10 is turned off, an interrupt is generated, and the transmission information monitoring process ends. As described above, in the client-server system 1 to which the present invention is applied, the terminal device 30-1
Java applets running on the Web server 30-n are registered in the terminal information table 13a.
It is confirmed whether the Java applet included in the HTTP message transmitted from the server 20 to the terminal devices 30-1 to 30-n is registered in the terminal information table 13a. Then, if the Java applet included in the received HTTP message is already registered in the terminal information table 13a, the Java applet is not transmitted to the transmission destination terminal device, but an error message is transmitted.

Therefore, when the same Java applet is started on one terminal device in duplicate,
It is possible to solve a problem in which processing of these applets conflicts. Further, in the present embodiment, the function realized by the proxy server 10, that is,
Based on the transmission information monitoring processing, the terminal device 30- 1 to
30-n or the Web server 20.

[0038]

According to the present invention, on one terminal device,
By starting the same application repeatedly, it is possible to solve a problem in which processing of the application conflicts.

[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 diagram showing a data configuration of a terminal information table 13a.

FIG. 4 is a block diagram illustrating a functional configuration of a terminal device 30-1.

FIG. 5 is a flowchart showing transmission information monitoring processing executed by a 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 13a Terminal information Tables 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 (12)

[Claims] 1. A client-server system configured to transmit and receive data between a server and a terminal device via a network, wherein a specific type of application is transmitted from the server to the terminal device. Detecting means for detecting that the specific type of application is being executed in the terminal device; storing means for storing identification information for identifying that the specific type of application is being executed; and detecting by the detecting means based on the identification information. A determination unit that determines whether the application of the specific type and the application being executed on the terminal device are the same; an application of the specific type detected by the detection unit by the determination unit; If it is determined that the application running on the terminal device is not the same, In addition, the application detected by the detection unit is executable on the terminal device, and it is determined that the application of the specific type detected by the detection unit and the application running on the terminal device are the same. In this case, the client-server system comprises: execution control means for restricting execution of the application detected by the detection means on the terminal device. 2. An identification for changing the identification information stored in the storage means for the application to indicate that the application is not executed, when the execution of the application being executed on the terminal device is completed. 2. The client / server system according to claim 1, further comprising information changing means. 3. The specific type of application is J
3. The client-server system according to claim 1, wherein the client-server system is described in an ava language. 4. A server in a client-server system configured to transmit and receive data between a server and a terminal device via a network, wherein a specific type of application is transmitted from the own device to the terminal device. Detecting means for detecting that the specific type of application is being executed in the terminal device; storing means for storing identification information for identifying that the specific type of application is being executed; and Determining means for determining whether the detected specific type of application is the same as the application being executed on the terminal device; and determining, by the determining means, the specific type of application detected by the detecting means. Determines that the application running on the terminal device is not the same as the application running on the terminal device. When the application is detected, the application detected by the detection unit is transmitted to the terminal device, and it is determined that the application of the specific type detected by the detection unit is the same as the application running on the terminal device. A transmission control unit that does not transmit the application detected by the detection unit to the terminal device when the application is detected. 5. An identification for changing the identification information stored in the storage means for the application to indicate that the application is not executed, when the execution of the application being executed on the terminal device is completed. 5. The server according to claim 4, further comprising an information changing unit. 6. When the determination unit determines that the specific type of application detected by the detection unit and the application being executed in the terminal device are the same, the terminal device transmits the specified identification information to the terminal device. 6. The server according to claim 4, further comprising an error message transmitting unit that transmits an error message indicating that the type of application is not transmitted. 7. The specific type of application is J
The server according to any one of claims 4 to 6, wherein the server is described in an ava language. 8. A terminal device in a client-server system configured to transmit and receive data between a server and a terminal device via a network, wherein when execution of a specific type of application is completed, A terminal device for transmitting an end message indicating the end of execution of an application to a predetermined server. 9. The specific type of application is J
9. The terminal device according to claim 8, wherein the terminal device is described in an ava language. 10. A transmission information monitoring method in a client / server system configured to transmit / receive data between a server and a terminal device via a network, wherein the specific type of application is executed in the terminal device. A detection step of detecting that a specific type of application is transmitted from the server to the terminal device in a state where identification information for identifying that the application is being executed is stored; and A determining step of determining whether an application of a specific type detected by the means and an application running on the terminal device are the same; and, in the determining step, the specific type of application detected in the detecting step. The application and the application running on the terminal device If the is determined to be not identical Shon, the detected application in the detection step and can be executed by the terminal device,
If it is determined that the application of the specific type detected in the detection step is the same as the application being executed in the terminal device, the application detected in the detection step is executed in the terminal device. An execution control step of restricting execution; and a transmission information monitoring method, comprising: 11. An identification information changing step of changing the stored identification information of the application so as to indicate that the application is not executed, when the execution of the application being executed in the terminal device is completed. The transmission information monitoring method according to claim 10, further comprising: 12. The specific type of application,
12. The transmission information monitoring method according to claim 10, wherein the transmission information monitoring method is described in Java language.