JP2522435B2 - Input message guarantee method for computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for guaranteeing an input message of a computer system. The present invention relates to an input message guarantee method for a computer system that can prevent the loss of a message that has been input from a terminal device.

〔Overview〕

The present invention is an input / output message guarantee method of a computer system in which a host computer and a terminal device are connected via a communication processing device, in which an input message is previously logged in a message logging area in the communication processing device, and the host computer or host When a failure occurs in the application program that is running on the computer, it is retransmitted to the application program after the failure is recovered, so that the input message is prevented from being lost due to the occurrence of the failure.

[Conventional technology]

Conventionally, this kind of technology has been realized as the function of the application program means itself on the host computer or the function of the operating system of the host computer, and failure recovery is performed based on the log data written in the external storage device of the host computer. I was doing a telegram recovery later.

[Problems to be solved by the invention]

In the above-mentioned conventional method, since the log data for message recovery is held in the external storage device on the host computer, the log data cannot be completely written depending on the failure occurrence timing of the host computer or the application program means, The input message could be lost.

Further, in a hot standby system or the like, it is necessary to take over the log data from the operating system to the standby system, and unless there is an external storage device that can be shared by both systems, there is a drawback that the system for taking over becomes complicated.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a method capable of preventing the loss of an input message due to a failure of the host computer or its application program means.

[Means for solving problems]

According to the present invention, a host computer and a terminal device are connected via a communication processing device, and the host computer performs a task between a communication access control unit that controls communication with the communication processing device and the terminal device. Host communication control means for controlling data transfer with the host computer, terminal communication control means for controlling data transfer with the terminal device, and the host computer And data transfer control between the terminal device and
In an input message guarantee method of a computer system including a route control and a data transfer control unit for performing boundary control, after receiving an input message from the terminal device to the communication processing device, the response is received. The message reply waiting queue that temporarily holds until and the message logging area that logs the input message are provided, and if the response is an affirmative response, the input message that is held in the message reply waiting queue is the message logging area. Input message logging means for logging in, a input message releasing means for discarding an input message already logged in the message logging area according to a message discarding instruction from the application program means, and a failure recovery of the host computer or the application program means The input messages that have already been logged are sequentially fetched in the message logging area Characterized in that it comprises an input message retransmitting means for retransmitting the.

It is preferable that the data transfer control means includes means for giving a message sequence number to an input message addressed to the application program means.

The electronic message logging area on the communication processing device is set on an external storage device such as a main memory or a magnetic disk device, and which one is to be used is determined by the processing capacity of the communication processing device and the amount of input electronic message.

The configuration form of the host computer and the communication processing device includes a one-to-one single tail type and an n to one multi-tail type. In the latter case, it can be used as a hot standby system for a highly reliable system, a host computer in a mutual standby system between application programs, or an input message guarantee method in the event of a failure of the application program means.

[Action]

During normal operation, when the data transfer control means receives a message from the terminal device via the terminal communication control means, it assigns a message sequence number to the input message and sends it to the application program means on the host computer via the host communication control means. Send to.

Next, the input message is temporarily held in the message response waiting queue, and when an affirmative response is received from the application program means, the response is returned to the terminal device, and the input message logging means is called and placed in the message response waiting queue. Register the held input message in the message logging area.

When the processing of the input message is completed by the application program means,
The terminal device name and the message sequence number of the processed message are set in the message release instruction and transmitted to the communication processing device via the communication access control means.

When the input message release means receives the message release instruction via the host communication control means, it refers to the message logging area based on the terminal device name and the message sequence number, and the input messages below the message sequence number are output from the message logging area. Discard.

Therefore, the input message that has not been processed by the application program means is completed in the processing even after the positive response is returned to the terminal device, and is held in the message logging area until the message release instruction is issued, and the host computer or the application program means thereof. Upon detection of the failure recovery of (1), the input message retransmitting means sequentially takes out the input message held in the message logging area for each terminal device, and retransmits it via the data transfer control means.

As a result, the input message can be prevented from being lost due to a failure, and the processing can be simplified. Furthermore, even in the case of a hot standby system or a mutual standby system, it can function as a shared device and improve economic efficiency and efficiency. You can

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. First
FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In the embodiment of the present invention, a host computer 1 and a terminal device 3 are connected via a communication processing device 2, and the host computer 1 communicates with an application program means 4 for executing a task with the terminal device 3 and communication. A communication access control means 5 for controlling communication with the processing device 2, and the communication processing device 2 includes a host communication control means 6 for controlling a communication path with the host computer 1 and data transfer, and a terminal device. 3 and the terminal communication control means 7 for controlling the communication path and the data transfer between the host computer 1 and the terminal device 3, and the route control and the boundary control for the data transfer between the host computer 1 and the terminal device 3. Data transfer control means 8 for assigning a message sequence number to the input message, and further, after transmitting the input message from the terminal device 3 to the application program means 4, temporarily holding it until a response is received. A message response waiting queue 13, a message logging area 10 set in the main memory for logging input messages, and when receiving an affirmative response from the application program means 4, it is called from the data transfer control means 8 and waits for a message response. The input message logging means 9 for registering the input message held in the queue 13 in the message logging area 10 and the completion of the processing of the input message by the application program means 4 store the terminal device name and the message sequence number of the processed input message. Receiving a message release instruction via the host communication control means 6,
Via the input message releasing means 11 for discarding the input message below the message sequence number by referring to the message logging area 10 by the terminal device name, and the failure recovery host communication control means 6 of the host computer 1 or its application program means 4. It includes an input message retransmitting means 12 for detecting and retrieving an input message from the message logging area 10 for each terminal device and retransmitting it to the application program means 4 via the data transfer control means 8.

Next, the operation of the embodiment of the present invention thus configured will be described.

When the data transfer control means 8 receives a message addressed to the application program means 4 of the host computer 1 from the terminal device 3 via the terminal communication control means 7, a local message sequence between the host computer 1 and the communication processing device 2 is received. A number is assigned to each terminal device and transmitted to the application program means 4 via the host communication control means 6. Further, the input message is held in the message response waiting queue 13 until a response is received from the application program means 4, and when an affirmative response is received from the application program means 4 via the host communication control means 6, the response is sent to the terminal communication. It returns to the terminal device 3 via the control means 7, and calls the input message logging means 9.

The input message logging means 9 registers the input message in the message logging area of the terminal device. Input message release means 11
When receiving a telegram release instruction from the application program means 4 via the host communication control means 6, refers to the telegram logging area 10 on the basis of the terminal device name and the telegram sequence number stored therein, and below the telegram sequence number. The input message of is discarded.

After the failure of the host computer 1 or its application program means 4, the input message retransmitting means 12 becomes the application program means 4
When the recovery of the fault is detected via the host communication control means 6, the electronic message logging area 10 is referred to for each terminal device, the registered input electronic message is taken out, and the application program means 4 is executed via the data transfer control means 6. resend.

FIG. 2 is a diagram showing an example of a message guarantee control sequence by retransmitting an unprocessed message when a failure occurs in the application program means 4.

When the data transfer control means 8 receives the input electronic message D1 from the terminal device 3, it adds the electronic message sequence number n to the input electronic message and sends it to the application program means 4. further,
The input message D1 (n) for waiting for a response from the application program means 4 is held in the message response waiting queue 13.

When the positive response R1 to the input message D1 (n) is received from the application program unit 4, the data transfer control unit 8 calls the input message logging unit 9 to take out the input message D1 (n) from the message response waiting queue 13 and log the message. Register in Area 10.

Similarly, the next input message D2 is also given a message sequence number n + 1, transmitted to the application program means 4, and then an acknowledgment R2 is received and registered in the message logging area 10. At this time, the input message D1 of the application program means 4
When the process for (n) is completed and the electronic message release instruction P (terminal device name, n) is received, the input electronic message releasing means 11 refers to the electronic message logging area 10 and refers to the electronic message sequence of the input electronic messages corresponding to the terminal device name. Discard the number n and below. In the case shown in FIG. 2, the input message D1 (n) is discarded.

In this state, when the failure of the application program means 4 occurs and the recovery thereof is detected by the input message resending means 12, the registered input message is taken out from the message logging area 10 for each terminal device and resent to the application program means 4. . Second
In the sequence shown in the figure, the input message D2 (n + 1) is retransmitted.

FIGS. 3 (a) and 3 (b) are formats of electronic messages exchanged for guaranteeing an input electronic message between the host computer 1 and the communication processing device 2 in FIG. The “message sequence number” is added to the input message received from the terminal device 3. The message release instruction is composed of the “terminal device name”, the processed “message sequence number”, and the “instructed number” indicating the number of pairs.

Further, the host computer 1 on which the application program means 4 operates does not have to be the same before and after the failure recovery, and the following applications are possible by identifying the recovery host computer when the failure recovery is detected. .

A hot standby system switching system that uses multiple host computers to switch to the standby host computer when the operating host computer fails.

Mutual standby system switching system to standby system application programs when multiple application programs fail.

〔The invention's effect〕

As described above, according to the present invention, a telegram received from a terminal device is temporarily stored in a storage device such as a main memory of a communication processing device, and is stored in a host computer or an application program unit operating on the host computer. When a failure occurs, it is possible to prevent the input message from being lost due to the failure by retransmitting the unprocessed input message from the communication processing device to the application program unit by the application program means after the recovery. It is no longer necessary to guarantee the input message by itself, and the processing of the application program means can be simplified.

In the hot standby system and the mutual standby system, it is difficult to guarantee the input message when there is no external storage device that can be shared by the operating system and the standby system or when the terminal device does not retransmit. Even in such a system, the communication processing device serves as a shared device, which has the effect of improving the economical efficiency and efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a sequence chart showing an operation example of input message guarantee control of the embodiment of the present invention. 3 (a) and 3 (b) are diagrams showing a message format for guaranteeing an input message that is communicated between the host computer and the communication processing device in the embodiment of the present invention. 1 ... Host computer, 2 ... Communication processing device, 3 ... Terminal device, 4 ... Application program means, 5 ... Communication access control means, 6 ... Host communication control means, 7 ... Terminal communication control means, 8 ... Data transfer control means, 9 ... input message logging means, 10 ... message logging area, 11 ... input message releasing means, 12 ... input message resending means, 13 ... message response waiting queue.

Claims (2)

(57) [Claims] 1. A host computer and a terminal device are connected via a communication processing device, and a communication access control means for controlling communication with the communication processing device is provided to the host computer; An application program unit for executing the above, wherein the communication processing device includes a host communication control unit that controls data transfer with the host computer, a terminal communication control unit that controls data transfer with the terminal device, and the host, An input message guarantee method for a computer system, comprising: a data transfer control means for performing data transfer control, route control, and boundary control between a computer and the terminal device, wherein the communication processing device includes an input message received from the terminal device. After sending the message to the application program means, a message response waiting queue that temporarily holds until a response is received, and an input message is logged. An electronic message logging area is provided, and when the response is an affirmative response, the input electronic message logging means for logging the input electronic message held in the electronic message response waiting queue in the electronic message logging area, and the electronic message discarding from the application program means Input message releasing means for discarding input messages already logged in the message logging area according to an instruction, and input message messages logged in the message logging area are sequentially taken out when the host computer or the application program means recovers from the failure. An input message guarantee method for a computer system, comprising: 2. An input message guarantee system for a computer system according to claim 1, wherein said data transfer control means includes means for giving a message sequence number to an input message addressed to said application program means.