JPH03218549A - Telegram guarantee system - Google Patents

Abstract

PURPOSE:To inexpensively constitute terminals by transmitting a telegram stored in an external storage device to a host computer by means of receiving information on the restoration of a fault in the host computer. CONSTITUTION:An identification number giving means 22 gives a unique identification number to the telegram transmitted from the terminals 3 to the host computer 1 in a system. A copy means 23 stores the telegram to which the identification number is given in the external storage device 4 and transmits it to the host computer 1. The host computer 1 transmits the response of telegram processing completion including the identification number which is given to the telegram whose processing completes when the processing as against the telegram transmitted from the terminal 3 completes. An abolishment means 25 abolishes the telegram to which the identification number is given, which is included in the telegram processing completion response in the telegram stored in the external storage device 4 by receiving the telegram processing completion response. Furthermore, a retransmission means 26 transmits the telegram stored in the external storage device to the host computer by receiving information on the restoration of the host computer. Thus, the terminals are economically constituted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a system in which a host computer and a terminal are connected via a communication processing device, and in particular, the present invention relates to a system in which a host computer and a terminal are connected via a communication processing device. This invention relates to a message guarantee method that guarantees even if a failure occurs.

[Conventional technology]

In order to guarantee the message sent from the terminal to the host computer even if a failure occurs in the host computer, conventionally the terminal has a storage device and the same message sent to the host computer is stored in the storage device. A function to store messages that are notified that the processing has been completed by a message processing completion response from the host computer from the storage device, and a function to discard the messages stored in the storage device when the host computer recovers from a failure. It is designed to have a function to send the data to the host computer.

[Problem to be solved by the invention]

Conventionally, as described above, there has been a problem that the terminals have to be provided with various functions, which makes the terminals expensive.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a system in which a host computer and a terminal are connected via a communication processing device. an identification number assigning means for assigning an identification number; a copying means for storing a message to which an identification number has been assigned by the identification number assigning means in an external storage device and transmitting it to the host computer; and an identification number from the host computer. and a discard means for discarding a message to which the identification number is assigned among the messages stored in the external storage device by receiving a message processing completion response including the message processing completion response, and receiving a failure recovery notification of the host computer. and retransmission means for sending the message stored in the external storage device to the host computer, and the host computer completes the process when the process for the message assigned the identification number is completed. A message processing completion response containing the identification number assigned to the message sent is sent.

[For production]

The identification number assigning means assigns a system-unique identification number to the message sent from the terminal to the host computer. The copying means stores the message to which an identification number has been assigned by the identification number assignment means in an external storage device and sends it to the host computer. When the host computer completes processing of the message sent from the terminal, it sends a message processing completion response that includes the identification number assigned to the message for which processing has been completed. Upon receiving the message processing completion response from the host computer, the discarding means discards the message to which the identification number included in the message processing completion response is assigned, among the messages stored in the external storage device. The retransmission means sends the message stored in the external storage device to the host computer by receiving the recovery notification from the host computer.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention, which includes a host computer 1, a communication processing unit W2, and a plurality of terminals 3-1 to 3-3.
N, the external storage device 4 of the communication processing device 2, and the intersystem communication path 5 that connects the host computer 1 and the communication processing device 2.
It is composed of. Host computer 1 is terminal 3-1~
The communication processing device 2 includes an application program 11 that processes messages sent from the terminal 3-N, and a communication management program 12 that manages communication between the host computer 1 and the communication processing device 2. A transmitting/receiving means 21 for transmitting and receiving information between terminals 1 to 3-N, and terminals 3-1 to 3-N.
an identification number assigning means 22 for assigning a unique identification number in the system to a message sent from the system; and a transmitting/receiving means 24 for storing the message to which the identification number has been assigned in the external storage device 4;
a copying means 23 for transmitting information to the host computer 1 via the intersystem communication path 5; A discarding means 25 for discarding a message assigned the same identification number as the identification number included in the message processing completion response, a means for transmitting and receiving a message stored in the external storage device 4, and an inter-system communication path. 5 to the host computer l.

2 to 4 are explanatory diagrams of the operation of FIG. 1, and the operation of this embodiment will be explained below with reference to each figure. First, the operation when the host computer 1 is operating normally will be explained with reference to FIG.

Now, for example, assume that the terminal 3-1 outputs a message a addressed to the host computer I. The message a from the terminal 3-1 is received by the transmitting/receiving means 21 in the communication processing device 2, and is added to the identification number assignment stage 22. Identification number assigning means 22 is terminal 3-1
An identification number consisting of information indicating the terminal 3-1 as the sender and a message identification number unique to the terminal 3-1 is given to the message a sent from the terminal 3-1, and the message is added to the copying means 23. The copying means 23 copies the message b with the identification number added from the identification number adding means 22, transmits one to the host computer 1 via the transmitting/receiving means 24 and the inter-system communication path 5, and copies one It is stored in the external storage device 4 of the communication processing device 2 as a guarantee.

When the message b is added via the communication processing device 2, the communication management program 12 of the host computer 1 sends an affirmative or negative response to the terminal 3-1 through intersystem communication if the message b requests a response. 5 to the communication processing device 2.

This positive response or negative response is added to the terminal 3-1 via the transmitting/receiving means 2421, and the terminal it retransmits the message when a negative response is added.

Further, if the communication management program l2 successfully receives the message b, it adds the received message b to the application program 11. The application program 11 processes the message b, and when the process for the message is completed, the communication management program 12 sends a message processing completion response including the identification number assigned to the processed message b via the intersystem communication B5. and add it to the communication processing device 2.

The message processing completion response from the host computer 1 is sent to the communication processing unit W.
When the message processing completion response is received by the sending and receiving device 24, the discarding device 25 selects a message included in the message processing completion response from among the messages stored in the external storage device 4. Discard messages that have been given the same identification number as the identification number. Therefore, the external storage device 4 stores messages that have not been processed by the host computer 1.

Next, referring to FIG. 3, the operation when the host computer I is not operating due to a failure will be described.

When host computer 1 is not operating due to a failure, terminal 3
-1 sends a message addressed to host computer 1, terminal 3
The message from -1 is added to the identification number assigning means 22 via the transmitting/receiving means 21, and after being assigned an identification number by the identification number assigning means 22, it is stored in the external storage device 4 by the copying means 23.

Next, the operation when the host computer 1 is restored will be explained with reference to FIG.

When the host computer 1 recovers from the fault, it notifies the communication processing device 2 of the fault recovery. The failure recovery notification from the host computer 1 is received by the transmitting/receiving means 24 in the communication processing device 2, and when the transmitting/receiving means 24 receives the failure recovery notification, the retransmitting means 26 stores the message stored in the external storage device 4. The data is sequentially sent to the host computer 1 via the transmitting/receiving means 24.

After that, the same processing as explained in FIG. 2 is performed on the message.

〔Effect of the invention〕

As explained above, the present invention stores messages from terminals in the external storage device of the communication processing unit 1, and when a failure occurs in the host computer, the messages stored in the external storage device are stored in the external storage device after the failure is recovered. The message is sent to the host computer using a retransmission means within the communication processing device, and unlike conventional examples, the terminal does not need to have a function to guarantee the message, making the terminal more economical to configure. In addition, since a large number of terminals can be configured economically, the system can be configured economically. Furthermore, since the functions for guaranteeing the message are concentrated in the communication processing device, there is also the effect that maintenance becomes easier.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 to 4 are explanatory diagrams of the operation of FIG. 1. In the figure, 1... host computer, 2... communication processing device, 3-1 to 3-N... terminal, 4... external storage device, 5... inter-system communication path, 11 ...Application program, I2...Communication management program, 21.24...
- Transmission/reception means, 22... Identification number assigning means, 23... Copying means, 25... Disposal means, 26... Retransmission means.

Claims (2)

[Claims] (1) In a system in which a host computer and a terminal are connected via a communication processing device, the communication processing device has an identification function that assigns a system-unique identification number to a message sent from the terminal to the host computer. a number assigning means; a copying means for storing a message to which an identification number has been assigned by the identification number assigning means in an external storage device and transmitting it to the host computer; and a copying means for receiving a message processing completion response including the identification number from the host computer. a discarding means for discarding a message to which the identification number is assigned among the messages stored in the external storage device by receiving the message; retransmission means for sending a message stored in the device to the host computer, and the host computer, upon completion of processing for the message to which the identification number has been assigned, assigns the identification number to the message that has been completed. A message guarantee method characterized by sending a message processing completion response that includes an identification number. (2) The message guarantee system according to claim 1, wherein the identification number is composed of information indicating the terminal from which the message is sent and a message identification number that is unique for each terminal.