JPH0644255B2 - Inter-system communication control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention relates to communication control between computer systems connected by a communication line, and aims at an intersystem communication control system with high utilization efficiency of computer resources for the communication control. In a communication system having a two-computer system that executes an application program that communicates with each other via the subsystem, a predetermined number of first logical communication paths set between the subsystems, and each first logic One or more second logical communication paths, which are allocated by temporally dividing the physical communication path, and control means for allocating the communication transmitted by the first logical communication path to the second logical communication path. And a second logical communication path is assigned to the application in response to a communication start request of the application program. Te is configured to communicate between the application program.

[Industrial application field]

The present invention relates to a communication control method between computer systems connected by a communication line.

[Problems to be solved by conventional technology and invention]

FIG. 3 is a block diagram showing a configuration example of a conventional communication system.

The computer systems 1a, 1b are connected by a communication line 4 and are configured to execute a subsystem 2 and application programs 3a, 3b, 3c, etc. that mutually communicate with a partner computer system via the subsystem 2, respectively. .

For communication between the application programs between the computer systems, the communication control unit 5 sets an inter-subsystem session between the subsystems 2 of both computer systems, and the application program 3 which has a communication start request.
One session is assigned to each of a, 3b, 3c, etc., and the application programs 3a of the computer systems 1a and 1b,
Communication between application programs (message transfer) by connecting 3b or 3c etc. to both ends of the session
To enable.

Here, the inter-subsystem session is a physical communication line 4
Is a logical communication path controlled so as to be divided by a plurality of sessions and shared in time, and the communication line 4 (only one line for the sake of explanation in the figure, but generally there may be a plurality of lines). ) Is shared by the session control unit 6 and is distributed to the inter-subsystem sessions 7.

In setting the inter-subsystem session, the communication control unit 5
Confirms the session name, buffer size, and communication protocol with the other party's communication control unit 5 (whether the message may be divided and transmitted, restrictions on the command used for communication control, etc.) In addition, it is necessary to send and receive, for example, several thousand bytes of management information to create the control information of each inter-subsystem session 7 in each communication control unit 5, and therefore the inter-subsystem session is set comparatively. It takes a long processing time.

Therefore, normally, when the system starts operating, the number of inter-subsystem sessions specified by the system operator is set in advance, and if there is a communication start request from the applications 3a, 3b, 3c, etc., it is assigned at that time. The processing is speeded up by only allocating one of the unused sessions to the request source application.

Therefore, for example, it is necessary to plan the required number of inter-subsystem sessions so as to support the maximum number of applications that are in communication at the same time during the busiest day, and to maintain those sessions. There is a problem that the storage area for the control information and the like is unnecessarily occupied even in a quiet time.

An object of the present invention is to solve the above-mentioned problems and to provide an intersystem communication control method capable of efficiently using computer resources.

[Means for solving problems]

 FIG. 1 is a block diagram showing the configuration of the present invention.

The figure shows the configuration of a communication system. Computer systems 10a, 10b 11 connected by a communication line 4 are application programs 3a, 3 for communicating with each other via a subsystem 14.
A logical communication path between application programs for carrying communication such as b and 3c is set on the logical communication path between subsystems controlled by the communication control unit 5, and communication to the logical communication path is set. This is an application layer communication control unit that controls distribution.

[Action]

For communication between application programs between computer systems, the communication control unit 5 sets an inter-subsystem session similar to the conventional one between the subsystems 14 of both computer systems as a first logical communication path. Generally, a plurality of inter-subsystem sessions can be set.

Subsystem 14 includes application programs 3a, 3b,
For each communication start request such as 3c, the application layer communication control unit 11 is requested to allocate an application layer session which is a second logical communication path forming a communication path between application programs.

The application layer communication control unit 11 sets the application layer session which is obtained by dividing the inter-subsystem session by time and allocates it to the requested application program. It also controls the communication carried by the inter-subsystem session to each application layer session and controls the application layer session for which communication has ended to the unallocated state.

By this control method, the inter-subsystem session is shared by a plurality of application program communication and the utilization efficiency is improved, so that the required number of inter-subsystem sessions for processing the required communication traffic is reduced.

〔Example〕

For communication between application programs between computer systems, for example, when the system starts operating, the communication control unit 5 sets the number of inter-subsystem sessions specified by the system operator as in the conventional system. It is set in advance as a logical communication path between them.

However, as will be described later, each inter-subsystem session is not individually assigned to each application program communication as in the conventional case, but is divided into a plurality of application program communication in time and shared by the present invention. Therefore, the number of sessions to be set may be determined so that it can carry the traffic volume at the time of the busiest communication,
Generally, it is possible to greatly reduce the amount as compared with the conventional one.

Further, although only one inter-subsystem session is shown in FIG. 1 for the sake of explanation, in general, a plurality of inter-subsystem sessions may be provided.

Subsystem 14 includes application programs 3a, 3b,
In a communication start request such as 3c, the application layer communication control unit 11 is requested to allocate an application layer session 12 that constitutes a communication path between application programs.

The application layer session 12 is a logical communication path managed by the application layer communication control unit 11 and divided and assigned between subsystems in terms of time, and a plurality of application layer sessions 12 are connected between subsystems. Session 7 can be shared.

FIG. 2 shows an example of the processing flow of the application layer communication control unit 11, and the application layer communication control unit 11 performs processing steps when receiving a request.
In step 20, it is identified whether or not there is an unallocated application layer session, and if there is an unallocated application layer session 12, it is allocated to the request source application program 3a, 3b or 3c in processing step 21.

If there is no unallocated application layer session, the application layer session 12 is set by exchanging control information with the application layer communication control unit 11 of the partner computer system in the processing step 22, and when it is set, the processing proceeds to the processing step 21. It is assigned to the request source application program in the same manner as described above.

After that, the communication between the application programs requesting the start of communication is performed by the application programs 3a, 3b or
By the application layer session 12 assigned to 3c, etc., a plurality of application layer sessions 12 share the inter-subsystem session 7, and the distribution control unit 13 performs communication carried by the inter-subsystem session 7 by each application layer session 7. Divide to 12.

When the application program explicitly specifies the end of communication, or when the application program ends, the subsystem 14 notifies the application layer communication control unit 11 of the end, and the application layer communication control unit 11 communicates the completed application program. The management information of the application layer session 12 that has been assigned to is set to the unassigned state.

As mentioned above, even when setting the application layer session,
Since it is necessary to exchange some control information with the partner computer system, at least one application layer session should be set in advance at the start of system operation, and every time the application layer session is unallocated, the application layer session is deleted. By presetting, it is possible to further speed up the communication start request processing.

By the above control method, the number of inter-subsystem sessions can be reduced by sharing the inter-subsystem session for communication between a plurality of application programs to improve the utilization efficiency.

〔The invention's effect〕

As is clear from the above description, according to the present invention, in the inter-application program communication between the computer systems connected by the communication circuit, by increasing the utilization efficiency of the inter-subsystem session, the computer resources for communication control are provided. There is a remarkable industrial effect of improving the utilization efficiency of.

[Brief description of drawings]

 FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a flow chart of processing of an application layer communication control unit, and FIG. 3 is a block diagram showing a conventional configuration example. In the figure, 1a, 1b, 10a and 10b are computer systems, 2 and 14 are subsystems, 3a, 3b and 3c are application programs, 4 is a communication line, 5 is a communication control unit, 6 is a session control unit, and 7 is a sub-system. An inter-system session, 11 is an application layer communication control unit, 12 is an application layer session, and 13 is a distribution control unit.

Claims (1)

[Claims] 1. A subsystem (14) and an application program (3a) for communicating with each other via the subsystem.
~ 3c) in a communication system having two computer systems (10a, 10b), a predetermined number of first logical communication paths (7) set between the subsystems, and each first logical communication. One or more second logical communication paths (12), which are assigned by dividing the path in time, and the communication transmitted by the first logical communication path are
And a control means (13) for allocating to the logical communication path of the application program, the second logical communication path is assigned to the application program by a communication start request of the application program (11), and the second logical communication path is assigned to the application program. An intersystem communication control method characterized in that it is configured to perform communication between the application programs.