JPH10143455A - Client/server system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To flexibly deal with the change of application on the side of server. SOLUTION: This system is constituted so that clients from 2-1 to 2-n and a server 3 can communicate through a network 1. In this case, a master port for receiving the start and end requests of service and a communication port for performing the service are respectively set to the server 3, and this master port is provided with a communication manager for reporting a communication channel number to be used to the clients from 2-1 to 2-n in response to the start request of service. Besides, the clients from 2-1 to 2-n are provided with interfaces for receiving the service by accessing the communication channel of the number reported by this communication manager.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a client / server system for communicating between a client and a server via a network.

[0002]

2. Description of the Related Art A server / client system is shown in FIG.
2, a plurality of clients 301-1 to 302-n and a server 303 are communicably connected via a network 301. Client 302
-1 to 302-n are provided with a client application A.
Is configured to access the server application A of the server 303 to perform a desired process and receive the result.

In the above, the clients 302-1 to 302-1
A single communication channel (number n) is negotiated between 302-n and server 303, and application A of clients 302-1 to 302-n accesses application A of server 303 by sharing this communication port. It is configured to be. When making a change to add a new application B on the server 303 side, as shown in FIG.
The communication ports (number m) for accessing the application B No. 03 are set to the clients 302-1 to 302-n.
And the server 303 must be negotiated.

[0004]

Therefore, the server 303
Each time there is a change in the application on the client side, the communication port to be used is changed for all clients 302-1 to 302-n.
The system had to be notified, and it was a rather cumbersome system.

On the server 303 side, only one communication port is set corresponding to one application, and a plurality of clients 302-1 to 30-30 are set.
When 2-n accesses the application at the same time, a response is made with priority given to the first access, and there has been a problem that it is not possible to sufficiently respond to a request from the client side.

The present invention relates to such a conventional client /
The purpose of the present invention is to provide a client / server system that can flexibly respond to changes in server-side applications. Another object is to provide a client / server system that can appropriately respond to access to an application of a server.

[0007]

A client / server system according to a first aspect of the present invention is a client / server system in which a client and a server communicate with each other via a network. A master port for receiving start and end requests;
A communication port for performing a service is individually set, and the master port includes a communication manager for notifying a client of a communication channel number to be used in response to a service start request. Is provided with an interface capable of accessing a communication channel of the number notified by the communication manager to receive a service. As a result, the service start request and the service end request are made to one master port, but the number of the communication port for receiving the service of the server is notified, and the service can be received using this communication port.
There is no need for the client to know in advance the communication port number for receiving the service.

[0008] The client / client according to claim 2 of the present invention.
In the server system, the server stores load module storage means storing at least one application load module, the number of communication ports to be used, and the storage address of the corresponding load module corresponding to the service. A server process management information storage unit, wherein the communication manager generates server processes for the number of used communication ports based on the information in the server process management information storage unit at the time of initial startup, and The communication port number to be assigned is notified, and an access from a client arriving using the communication port is waited. As a result, a predetermined number of server processes are generated at the time of initial startup, are associated with communication ports, and can respond to incoming access using the communication ports.

According to the third aspect of the present invention, the client /
In the server system, the server is provided with communication status management information storage means for storing the assigned service name and the name of the client being used, corresponding to the number of each communication port. When there is a service start request from the communication state management information storage means, a search is made for the number of available communication ports based on the information in the communication state management information storage means, and the number is notified to the client. It is characterized in that the information in the storage means is rewritten. Thus, when a service start request is issued from a client, the number of an available communication port is searched, the number is notified to the client, and the service of the server process can be received using the communication port.

[0010] The client / device according to claim 4 of the present invention.
In the server system, when the server manager changes the server process, the communication manager starts a new server process, stops the corresponding server process being started, changes the communication port, and stores the communication state management information storage means. Is changed. As a result, when the server process is changed in response to the application change in the server, only the server side can deal with the change without performing a process such as notifying the client side.

[0011] The client / client according to claim 5 of the present invention.
In the server system, when the communication manager receives the service termination request, it rewrites the information in the communication state management information storage means in response to the request and notifies the corresponding server process to stop the service. I do. As a result, the service termination from the corresponding server process can be realized in response to the service termination request from the client.

The client / client according to claim 6 of the present invention.
A server system is characterized in that a client sets a master port for sending a service start request and a service end request to a communication manager and a communication port for accessing a server process. . This makes it possible to send a service start request and a service end request to the server using the master port, and access the server process using the communication port corresponding to the notified communication port number.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A client / server system according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In the respective drawings, the same components are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 shows a client / server system according to an embodiment of the present invention. The client / server system is configured so that a plurality of clients 2-1 to 2-n communicate with a server 3 via a network 1. The clients 2-1 to 2-n are configured by a personal computer or a workstation, and the server 3 is configured by a workstation or a computer having functions and performances higher than the workstation.

The clients 2-1 to 2-n are provided with a client application (client API (application API)) which is an interface for performing basic processing such as when the application performs communication and data access. Program interface). The client application communicates by using the client API and setting and using a master port or a communication port of a predetermined number (here, a). That is, when issuing a service start request and a service end request, the request is transmitted using the master port, and when receiving the service, communication is performed using a communication port of a predetermined number. The master port number (port number) is previously set commonly to the clients 2-1 to 2-n and the server 3.

On the other hand, the server 3 stores load module storage means 4 storing at least one application load module, the number of communication ports to be used, and the storage address of the corresponding load module corresponding to the service. A stored server process management information storage means 5, a communication state management information storage means 6 for storing a service name assigned in correspondence with a number of each communication port, and a client name in use; A communication manager is provided for responding to service start and end requests from clients 2-1 to 2-n. Server 3
Is provided with a server application process (the same as the server process or the same process) that is started by the communication manager at the time of initial startup. In addition, when the server application communicates with the application or accesses data. A server API (application program interface), which is an interface for performing basic processing, is provided.

The client / server system as described above is realized, for example, as a system shown in FIG.
In the system shown in FIG. 9, the data server 3 serving as a server stores information on the plant 10 in a process DB (data base).
The client is managed using the data server 3 and a plurality of clients 2-1 to 2-n obtain information from the data server 3 via an information LAN 1 and perform various processes.

In the above client / server system, the server process management information storage means 5 of the server 3
10, the storage location (address) of the server application A corresponding to the service name A, as shown in FIG.
And 10 used ports are stored. The communication manager of the server 3 operates according to the program shown in the flowchart in FIG.

When the server 3 is started, an initial startup process is performed (S1). The process at the time of the initial startup is shown in detail in FIG. That is, the corresponding application load modules are read out from the load module storage unit 4 based on the storage location stored in the server process management information storage unit 5, and the server processes for the number of used ports, that is, 10 ports are generated and activated ( S7). Then, the generated process is notified of the number of the communication port to be used (here, 1000 to 1009), and the process is set to the respective startup parameters (S
8). As a result, as shown in FIG.
The system enters a state of waiting for a request from the client 2-12-n for each communication port of the port numbers 1000 to 1009.

When the communication manager of the server 3 completes the initial startup processing (S1), it detects whether or not there is a request from the client (S2). Here, when a request from the client is detected, a client request process is executed (S3). Specifically, the client performs an operation as shown in the flowchart of FIG. 6, and the communication manager performs processing as shown in the flowchart of FIG. First, in response to an instruction from the client application A of the client, the client API uses the master port to notify a start (open) request of the service A to the communication manager (S21). On the other hand, the communication manager receives the service name that the client wants to use from the master port (S14), searches the communication state management information storage unit 6 to detect a port not used by the client, and selects a process in charge. Here, the communication state management information storage means 6 stores information as shown in detail in FIG. That is, the name of the client in use is stored corresponding to the service name and the communication port number. When the client name is not stored, it indicates that it is not used. When the assigned process is selected, the corresponding unused communication port number is notified to the client using the master port, and the communication state management information is rewritten (S16). That is, the client name is written, indicating that the communication port is in use.

In response to the above, the client application A of the client receives the notified communication port number to be used (S22).
To access the server process using the communication port to transmit a processing request (S23). In response, the server application process A performs processing and returns a result using the communication port. With this configuration, the server 3 receives only the service start request and the end request from the client using the master port, and notifies the communication port actually used for communication. Can be efficiently processed by one master port. Further, since the number of communication ports can be set according to the expected amount of service requests, it is possible to sufficiently cope with a case where the same service request is issued from a plurality of clients at the same time. In the example of FIG. 10, ten clients (client name; No. 1)
-No. 10) shows a case where all requests for service A are made to the server 3 and accepted.

As described above, when the client receives the result of the processing request from the server process, the client ends the access request (S24). And
The client sends the request to the communication manager using the master port together with the number of the communication port that used the close (end) request (S25). On the other hand, as shown in FIG. 2, the communication manager detects the presence or absence of a close request (S6), and upon detecting the close request, performs a process as shown in FIG. In other words, the communication manager receives the communication request together with the communication port number that used the close request (S
26), while deleting the client name from the corresponding storage area of the communication management information storage means 6 (S27),
It notifies the server process of the communication port number and stops the service (S28).

As shown in FIG. 2, the communication manager of the server 3 detects whether there is a change in management information such as an additional change of a server process while the system is operating (S4). Then, when there is a change in the management information, a management information change process is executed (S5). For example, to add a new service B to the system shown in FIG.
The information shown in FIG. 11 is added to the server process management information storage means 5 (for example, by key input) and the server application B is stored in the load module storage means 4.
Load the load module for

When the information in the server process management information storage means 5 is changed in this way, the corresponding application load is loaded from the load module storage means 4 based on the storage location of the application B stored in the server process management information storage means 5. Reads the module and creates server processes for the number of ports used, that is, 10 ports.
to start. The number of the communication port to be used for each generated process (here, 2000 to 20)
09) and set it to the respective start parameters. As a result, as shown in FIG.
The system enters a state of waiting for a request for a communication port of each of the port numbers 2000 to 2009. Thus, the service B can be provided together with the service A.

When a service is replaced (upgraded), processing is performed as shown in FIG. That is, as in the case of the server application B, the corresponding application load module is read from the load module storage unit 4 based on the storage location of the new application stored in the server process management information storage unit 5, and the new server process is started. (S11). Then, an end request is issued to the running (old) server process to stop the old service (S12).
Furthermore, the generated process is notified of the number of the communication port to be used by each of the processes, and is set in each of the startup parameters, and the information of the communication state management information storage unit 6 is changed (S13). When deleting a service, only the above-described step S12 is performed. In other words, a termination request is issued to the server process to stop the service.

[0025]

As described above, according to the client / server system of the first aspect of the present invention, a service start request and a service end request are made to one master port, but the service of the server is received. The number of the communication port at the time is notified, the service can be received using this communication port, and it is not necessary for the client to know in advance the communication port number for receiving the service, so the service can be changed or added. Etc. can be executed only on the server side, which is efficient.

As described above, according to the client / server system of the second aspect of the present invention, a predetermined number of server processes are generated at the time of initial startup, are associated with communication ports, and use the communication ports. Therefore, by setting the required number of communication ports, service requests of the same contents from a plurality of clients can be simultaneously processed.

As described above, according to the client / server system of the third aspect of the present invention, when there is a service start request from a client, an available communication port number is searched and the client is notified of the request. Since the number is notified and the service of the server process can be received using the communication port, a plurality of communication ports can be freely allocated to perform efficient service allocation.

As described above, according to the client / server system of the fourth aspect of the present invention, when there is a change in the server process in response to a change in the application in the server, the client is notified of the change. This is convenient because only the server can respond without performing the above processing.

As described above, according to the client / server system according to the fifth aspect of the present invention, a service termination request from a client is received by a communication manager and a service stop from a corresponding server process is realized. Therefore, the process of allocating the server process to the client can be centralized in the communication manager, and an appropriate service can be provided.

As described above, according to the client / server system of the sixth aspect of the present invention, a service start request and a service end request are sent to the server using the master port, and the number of the communication port notified. The server process can be accessed using the communication port corresponding to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a client / server system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the client / server system according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation of an initial startup process in the client / server system according to the embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of management information change processing in the client / server system according to the embodiment of the present invention.

FIG. 5 is a flowchart for explaining the operation of a client request process in the client / server system according to the embodiment of the present invention.

FIG. 6 is a flowchart for explaining an operation of an access request process in the client / server system according to the embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation of a termination request process in the client / server system according to the embodiment of the present invention.

FIG. 8 is a diagram showing information in a communication state management information storage unit in the client / server system according to the embodiment of the present invention.

FIG. 9 is a diagram showing an example in which the client / server system according to the embodiment of the present invention is applied to plant information management.

FIG. 10 is a configuration diagram when a server process corresponding to service A is generated in the client / server system according to the embodiment of the present invention.

FIG. 11 is a configuration diagram when server processes corresponding to services A and B are generated in the client / server system according to the embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional client / server system.

FIG. 13 is a configuration diagram of a conventional client / server system.

[Explanation of symbols]

1 network 2-1 to 2-
n client 3 server 4 load module storage means 5 server process management information storage means 6 communication state management information storage means

Claims (6)

[Claims] 1. A client / server system in which a client and a server communicate with each other via a network, wherein the server has a master port for receiving a service start request and a service end request, and a communication port for performing a service. Are individually set, and the master port is provided with a communication manager that notifies a client of a communication channel number to be used in response to a service start request. A client / server system provided with an interface that enables access to a communication channel of the notified number to receive a service. 2. The server stores a load module storing means storing at least one application load module, a number of communication ports to be used, and a storage address of the corresponding load module corresponding to the service. Communication manager generates server processes for the number of used communication ports based on the information of the server process management information storage unit at the time of initial startup, and 2. The client / server system according to claim 1, wherein a communication port number to be allocated to the client / server is notified, and an access from a client arriving using the communication port is waited. 3. The server is provided with communication state management information storage means for storing an assigned service name and an in-use client name corresponding to each communication port number. When there is a service start request from the client, a number of an available communication port is searched based on the information of the communication state management information storage means, and the number is notified to the client. 3. The client / server system according to claim 1, wherein information in the management information storage unit is rewritten. 4. When there is a change in the server process, the communication manager starts a new server process, stops the corresponding server process being started, changes the communication port, and stores the communication state management information. 2. The information of a means is changed.
The client / server system according to any one of claims 1 to 3. 5. The communication manager, upon receiving the service termination request, rewrites the information in the communication state management information storage means in response and notifies the corresponding server process to stop the service. The client / server system according to any one of claims 1 to 4, wherein 6. A client is provided with a master port for sending a service start request and a service end request to a communication manager and a communication port for accessing a server process. The client / server system according to any one of claims 1 to 5, wherein