JPH06231062A - Connection repetition processing system - Google Patents

Abstract

PURPOSE:To attain the efficiency up of a connection repetition processing by providing an interface which registers information in a communication control module, and automatically operating flow control by the communication control module without any flow control instruction from a user. CONSTITUTION:A communication control module 4 operates normal communication control by a connection 1 for reception and a connection 2 for transmission, operates the flow control to the connection 1 for reception at the time of the occurrence of the fault of the connection 2 for transmission, and stops the reception of a new telegraphic message. That is, the information is registered in a connection registering part 6, and the flow control is automatically operated without any flow control instruction from a user 3. Thus, the flow control is operated by the communication control module 4 in response to the fault of the connection 2 for transmission, so that the number of the unnecessary telegraphic messages remaining in the connection repetition processing system due to the invalidity of the repetition processing can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of logical communication paths used by electronic computers to communicate with each other, that is,
A connection relay processing system relating to a connection relay processing system for performing relay processing between connections, and particularly suitable for efficiently suppressing the amount of unnecessary messages retained in a computer network when a failure occurs.

[0002]

2. Description of the Related Art In the communication of electronic computers and the like, both electronic computers and the like (hereinafter referred to as users) have agreed to share a logical communication path called a connection, It is often the case that each electronic message is identified for which user by adding information for identifying the connection to be used.

During communication using a connection, if one user of the connection cannot process a message received through the connection due to overload or the like, the other user is requested to On the other hand, I will notify that processing is impossible and hope that appropriate measures will be taken. An appropriate process here is to retry the transmission of the message or not to transmit the next message until it is notified that the message is returned to the receivable state. In this way, controlling the processing of message transmission by the other party on the receiving side is called flow control. Regarding the connection and flow control of the user network, see, for example, “Electronic Information and Communication Handbook” (198) edited by The Institute of Electronics, Information and Communication Engineers.
8 years, published by Ohmsha, Ltd.), pages 1887 to 19
It is described on page 16.

All communication control processing including flow control
Although it is possible for the user to control, in general, in order to reduce the burden on the user, a module having a communication control function (hereinafter referred to as a communication control module) is provided,
A user often uses the interface provided by this communication control module. When the user uses the interface provided by the communication control module, in order to transmit the electronic message, it is necessary to specify the content of the transmitted electronic message, and therefore it is necessary to issue an instruction for each transmission. On the other hand, regarding the reception of a message, the trigger for sending a message is asynchronous, and throughput is reduced if reception is not required except when the user gives a reception instruction. A technique is conceivable in which the communication control module automatically advances the reception of a message and the user uses the message already received by the communication control module at a necessary occasion.

In such a case, an example of the interface of the basic communication control function provided to the user by the communication control module is as follows. (A) Instruction from user to communication control module (A-1) Instruction to open connection Interface name: ESTABLISH_CONNECT
CTION input information: Own station user identification information, partner station user identification information Output information: Connection identification information (A-2) Connection termination instruction Interface name: RELEASE_CONNECT
ION input information: connection identification information (A-3) message transmission instruction interface name: SEND_DATA input information: connection identification information, transmission message instruction information (A-4) received message retrieval instruction interface name: RECEIVE_DATA input information: connection identification information Output information: Received message instruction information (B) Notification from communication control module to user (B-1) Connection failure notification Interface name: FAIL_indication Notification information: Connection identification information

[0006] In such a technique, there are a case where reception is impossible due to a factor of the communication control module and a case where the reception process is desired to be stopped due to a factor of a user. In the latter case, it is also existing in the related art that the communication control module provides a function for the user to instruct the stop of the reception process. An example of an interface in such a case is as follows. Is like. (C) Instruction from user to communication control module (C-1) Flow control instruction Interface name: SUSPEND_FLOW input information: Connection identification information (C-2) Flow control cancellation instruction Interface name: RESUME_FLOW input information: Connection identification information ( D) No notification from communication control module to user

In the connection relay processing, in a pair of two connections, a message received from one connection is processed as necessary by converting the protocol or changing the message format, and then from the other connection. The main content is to send. Therefore, if the connection used for transmission among the paired connections becomes unavailable due to a line failure or the like, relay processing can be performed even if the connection used for reception is normal. Can not. However, since the connection used for reception is normal, the reception processing is automatically advanced by the communication control module, and as a result, messages that cannot be relayed are accumulated on the local station side. Become.

When a flow control interface is provided to the user, for the purpose of reducing the number of electronic messages staying at the local station side, for example, as shown in FIG.
It is also possible for the user to instruct the flow control upon the detection that the connection used for transmission becomes unavailable. However, even in this case, since the user is notified from the communication control module that the transmission connection is unavailable and then issues a flow control instruction, until the flow control instruction is issued. Then, I received a message from the receiving connection, and again,
It is inevitable that an unprocessable message will occur.

FIG. 3 is a sequence diagram showing an example of a flow control operation by the conventional connection relay processing system. This example shows a flow control process of a user using the above-described communication control interface according to the related art. A received message a from the reception connection 31 is input to and stored in the communication control module 34. The user 33 extracts the received reception message a by the received message extraction instruction RCV and performs a process such as protocol conversion, and the communication reception module a transmits the processed reception message a by the message transmission instruction SND (a). And send connection 32
To send via.

During the relay process for this received message a, the next received message b is input and stored in the communication control module 34. The user 33 performs protocol conversion of the received message b after the transmission instruction of the received message a, and passes it to the communication control module 34 by the message transmission instruction SND (b). However, at this time, since the transmission connection 32 has become unusable due to a failure, the communication control module 34 instructs the communication control module 34 to send a message SND from the user 33.
The connection failure notification FAIL_ind is passed to the user 33 without accepting (b). The user 33 sends the flow control instruction SUS_FLW based on the connection failure notification FAIL_ind, and the communication control module 34
Flow control via.

By this flow control, the input of the reception message from the reception connection 31 is stopped. However, at the time when this flow control operates, the third reception message c to the fifth reception message e have already been input to the communication control module 34. As described above, in the conventional technique, when the transmission connection becomes unavailable, the communication control module notifies the user that the connection has become unavailable, and receives the notification. The person instructed to carry out flow control of the receiving connection at his own risk. Therefore, as shown in this example, only the received message a is normally relayed, but the received message b to the received message e are
Due to the failure of the transmission connection 32, the transmission process cannot be performed, and therefore the data is accumulated.

[0012]

The problem to be solved by the prior art is that in the prior art, when the transmission side connection becomes unusable due to a failure, the operation of receiving a telegram from the reception side connection is efficiently controlled. This is because many messages that cannot be relayed and cannot be relayed are accumulated. An object of the present invention is to solve these problems of the prior art and to suppress the increase of telegrams that are incapable of relay processing when the transmission connection becomes unavailable, thereby improving the efficiency of connection relay processing. It is to provide a connection relay processing system that does.

[0013]

In order to achieve the above object, the connection relay processing system of the present invention comprises (1)
In a connection relay processing system that relays a transmission connection and a reception connection established during communication on an electronic computer network, while performing communication control by the transmission connection and the reception connection, when a failure occurs in the transmission connection, It is characterized by providing a communication control module for performing flow control on the reception connection and suppressing reception of a new message. Also,
(2) In the connection relay processing system according to (1) above, the communication control module has a connection pair registration unit that registers a combination of a transmission connection and a reception connection that are performing relay processing, and a failure of the transmission connection. And a connection pair identifying unit that identifies the receiving connection to be paired by searching the connection pair registering unit when a failure in the connection of this failure detecting unit is detected. And a flow control unit for performing flow control on the received connection.

[0014]

According to the present invention, when a failure occurs in the transmission connection, the communication control module, not the user (electronic computer or the like), performs the flow control. That is, conventionally, the correspondence relationship between the receiving and transmitting connections in the relay processing is information that only the user senses, and the conventional communication control module does not have a mechanism for knowing this information. In the present invention, the communication control module is provided with an interface for registering this information, and the communication control module is provided with no flow control instruction from the user.
Flow control is performed automatically. As a result, the number of unnecessary messages that cannot be relayed and remain in the connection relay processing system can be suppressed.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a configuration relating to the present invention of a connection relay processing system of the present invention. In this figure, reference numerals 1 and 2 are a connection for reception and a connection for transmission which are established at the time of communication in an electronic computer network, and 3 is a computer for relaying the connection 1 for reception and the connection 2 for transmission. Who, 4
A communication control module for performing flow control according to the present invention, the communication control module 4 including a communication control processing unit 5 for performing conventional communication control based on a reception connection 1 and a transmission connection 2, and a communication control module according to the present invention. , A connection pair registration unit 6 for registering a combination of the reception connection 1 and the transmission connection 2 to be relayed
And a failure detection unit 7 for detecting a failure of the transmission connection 2, and when the failure detection unit 7 detects a failure of the transmission connection 2, the connection pair registration unit 6 is searched to find a reception connection 1 forming a pair. It comprises a connection pair identifying unit 8 for identifying, and a flow control unit 9 for performing flow control for the receiving connection 1 identified by the connection pair identifying unit 8.

With such a configuration, the communication control module 4 in the connection relay processing system of the present embodiment.
Performs normal communication control by the reception connection 1 and the transmission connection 2, and
When the failure occurs, the flow control for the reception connection 1 is performed and the reception of a new message is suppressed. That is,
Conventionally, the correspondence relationship between the reception connection 1 and the transmission connection 2 in the relay process is information sensed only by the user 3, and the communication control module 4 does not have a mechanism for knowing this information. However, the communication control module 4 of the present embodiment registers this information in the connection pair registration unit 6, and without the flow control instruction from the user 3,
Flow control is performed automatically. In this way, the communication control module 4 performs the flow control with respect to the failure of the transmission connection 2, thereby suppressing the number of unnecessary messages that cannot be relayed and stay in the connection relay processing system. it can.

The details of such a control operation will be described below. In the present embodiment, the user 3 is provided with an interface for registering a connection for performing a relay process as described below, in addition to the normal communication control interface described in the description of the related art. (E) Instruction from user to communication control module (E-1) Instruction to register connection correspondence interface name: DEFINE_RELAY_CO
CONNECTION Input information: Identification information of input connection in relay processing: Identification information of output connection in relay processing (F) Notification from communication control module to user (F-1) None

When the communication control module 4 detects a failure in the transmission connection 2 registered by this interface, as shown in FIG. 2, the flow control instruction from the user 3 (SUSP in the prior art)
Even if it does not receive (EN FLOW), the flow control is performed for the receiving side connection 1. When it is detected that the connection failure for the transmission connection 2 that has caused the flow control is released, the user 3 issues an instruction to release the flow control (RESU in the related art).
Even without receiving ME FLOW, the flow control performed for the receiving connection 1 is released.

FIG. 2 is a sequence diagram showing an embodiment of the processing operation according to the present invention of the connection relay processing system in FIG. The present embodiment shows a flow control process of the communication control module 4 using the communication control interface in FIG. 1, and a received message a from the reception connection 1 is input to the communication control module 4 and stored.
The user 3 receives the received electronic message fetching instruction RCV,
The received reception message a is taken out and subjected to processing such as protocol conversion, and according to the message transmission instruction SND (a), the processed reception message a is passed to the communication control module 4 and transmitted via the transmission connection 2.

During the relay process for this received message a, the next received message b is input and stored in the communication control module 4. After the transmission instruction of the reception message a, the user 3 performs protocol conversion of the reception message b, etc., and passes it to the communication control module 4 by the message transmission instruction SND (b). However, at this time, the transmission connection 2 becomes unusable due to a failure, so the communication control module 4
Does not accept the message transmission instruction SND (b) from the user 3 and notifies the user 3 of the connection failure notification FAIL_in.
Pass d. In the prior art, this connection failure notification F
Based on AIL_ind, the user 3 has performed flow control via the communication control module 4 by sending out a flow control instruction SUS_FLW, but in the present embodiment, a failure of the transmission connection 2 is detected. The communication control module 4 itself performs flow control for the reception connection 1.

By the flow control of the communication control module 4, the input of the reception message from the reception connection 1 is stopped. At the time when this flow control operates, the received message that has been input to the communication control module 4 is the second
The second received message b and the third received message c are only two, and the fourth received message d and the fifth received message e that have been input to the communication control module 4 in the conventional technique.
Is not retained. In this way, each of the received telegrams a to e arrives at the reception connection 1 with the same trigger as that shown in FIG. 3, and a failure occurs in the transmission connection 2 with the same trigger, but this implementation In the example, the communication control module 4 directly performs the flow control without waiting for the instruction from the user 3, so that the flow control is performed early.
As a result, only the received message a is normally relayed, which is the same as in the related art, but the only messages retained in the system are the received message b and the received message c.

As described above with reference to FIGS. 1 and 2, in the connection relay processing system of the present embodiment, two connection pairs for transmission and reception used for relay processing are communication controlled. Register in the module,
When the registered transmission connection becomes unavailable, the communication control module automatically performs flow control on the reception connection. As a result, it is possible to suppress an increase in the number of received telegrams that cannot be relayed in the connection relay processing system. The present invention is not limited to the embodiments described with reference to FIGS. 1 and 2, and various modifications can be made without departing from the scope of the invention.

[0023]

According to the present invention, when the connection on the transmission side becomes unusable due to a failure, the receiving operation of the message from the connection on the reception side can be efficiently controlled, and the number of staying reception messages for which relay processing is impossible is retained. It is possible to suppress the increase in the number of connections and improve the performance of the connection relay processing system.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a configuration relating to the present invention of a connection relay processing system of the present invention.

FIG. 2 is a sequence diagram showing an embodiment of the processing operation of the connection relay processing system in FIG. 1 according to the present invention.

FIG. 3 is a sequence diagram showing an example of a flow control operation by a conventional connection relay processing system.

[Explanation of symbols]

 1 reception connection 2 transmission connection 3 user 4 communication control module 5 communication control processing unit 6 connection pair registration unit 7 failure detection unit 8 connection pair identification unit 9 flow control unit 31 reception connection 32 transmission connection 33 user 34 Communication control module

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H04L 29/14

Claims (2)

[Claims] 1. A connection relay processing system for relaying a transmission connection and a reception connection established during communication in an electronic computer network, wherein communication control is performed by the transmission connection and the reception connection, and the transmission is performed. A connection relay processing system comprising: a communication control means for performing flow control on the receiving connection and suppressing reception of a new message when a failure occurs in a trusted connection. 2. The connection relay processing system according to claim 1, wherein the communication control means registers a combination of a transmission connection and a reception connection which are performing the relay processing, and the transmission pair registration means. Failure detecting means for detecting a failure in the trusted connection; connection pair identifying means for searching the connection pair registering means to identify the receiving connection forming a pair when the failure in the connection of the failure detecting means is detected; A connection relay processing system, comprising: a flow control means for performing flow control on the reception connection identified by the connection pair identification means.