JPH07120288B2 - Redundant message detection processing method of data processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] Regarding a redundant message detection processing method for preventing a service providing unit from entering a second service processing due to a redundant message, a service providing unit efficiently transmits a redundant message. For the purpose of being able to detect whether or not the message is a message sequence number addition device that adds a serial number to a transmitted message when the service request unit executes message transmission, and when the service request unit executes message retransmission, And a message serial number storage unit for storing the serial number of the message in object units when the service providing unit finishes the service processing according to the received message. Configure, and then the service provider creates the received message object When the generated object is used, the message serial number storage unit is checked when the generated object is used. By doing so, it is configured to detect whether or not it is a redundant transmission.

[Industrial application field]

The present invention relates to a redundant message detection processing method of a data processing device for preventing a server program that executes a predetermined service in accordance with a message from a user program from entering a second service process associated with redundant message transmission. Furthermore, the present invention relates to a redundant message detection processing method of a data processing device that enables a server program to efficiently determine whether or not the message is a redundant message.

In a data processing device including a server program that executes a predetermined service process and a user program that sends a message for requesting a service to the server program, the data processing device may be operated by the user program when an abnormal state occurs. The same message may be resent to the server program. If the server program repeatedly executes the same service process in response to such a message resending, a logical contradiction may occur. From now on, in the data processing apparatus having such a configuration, it is necessary to take measures to prevent the second service processing from being executed due to the retransmission of the message.

[Conventional technology]

The server program and the user program realize a request for service processing and a response thereto in accordance with a message. That is, as shown in FIG. 5, the user program executes a message transmission to the server program by calling a function such as "Send" prepared by the system, and the server program receiving the message requests the message. Execute the service processing that had And
When the server program finishes the processing, it sends a response message to the user program, and the user program knows that the requested service processing has been executed by receiving the response message.
At this time, the data obtained by executing the service process may be received. In this way, the user program is configured to receive a service from the server program by transmitting and receiving a message and execute desired processing.

With such a configuration, in the related art, when the server program does not return a response message despite sending the message, or when an abnormality detection unit provided separately does not return a response message, an abnormality detection notification is issued. When it came, the user program again sent the same message so that the server program could receive the service.

[Problems to be Solved by the Invention]

In the conventional technique which adopts such a message resending processing method, when the response message is not returned due to an abnormality during the service processing by the server program,
There is no problem because the service process is started again for the server program. However, when a response message is not returned to the user program due to the occurrence of an abnormality after the service processing by the server program is completed, as shown in FIG. 6, the server program is re-identified according to the service request message retransmission processing. The service processing of will be repeatedly executed. That is, in the prior art, redundant message re-transmission (herein,
It was happening).

Therefore, in the conventional technique, in addition to the problem that the processing efficiency is lowered due to the redundant transmission of the message, a further serious problem is that the iterative process may cause a logical contradiction. there were.

The present invention has been made in view of the above circumstances, and proposes a method for detecting a redundant message to prevent duplicate execution of service processing. It is an object of the present invention to provide a method capable of efficiently realizing detection.

[Means for Solving the Problems]

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

In the figure, 1 is a service providing unit that executes a predetermined service process, 2 is a service requesting unit that sends a service request message to the service providing unit 1, and 3 is A message serial number addition device for adding a serial number for identification to a message to be transmitted when the service request unit 2 executes message transmission, and 4 is a retransmission display addition device for the service request unit 2 Adds a retransmission indication to the transmitted message when the same message is retransmitted due to the occurrence of an abnormal state, 10 is a message receiver, 11 is a redundant transmission detector, and the received message is A means for detecting whether or not the service processing has already been completed and involved in retransmission, and 12 is a retransmission display detection unit, which is provided to the retransmission display addition device 4 for the received message. That detects whether or not there is a resend display, 13 is a service processing unit that executes service processing, and uses an object generation unit 14 that processes to generate a new object and the generated object And a data processing unit 15 for performing predetermined data processing, 16 is a generated or generated object, 17 is an object management unit that manages the object 16, and 18 is A message serial number storage unit provided in the object management unit 17, which stores the serial number attached to the message for which the service processing has ended in units of 16 objects, and 19 is a message serial number setting unit and a message serial number storage unit 18 A serial number is set to the service message, and 20 is a response message transmission unit, which terminates service processing for the service request unit 2. Which sends a response message indicating the, 21 is a message sending unit.

[Action]

According to the present invention, when the received message is related to object generation, the redundant transmission detection unit 11 first checks whether or not the message received by the retransmission display detection unit 12 is retransmitted. If it is determined in this determination that the retransmitted message is not attached, it is immediately determined that the message is not a redundant message because it is not a retransmitted message. On the other hand, when it is determined that the retransmitted display is provided, the message serial number storage unit 18 included in the object management unit 17 of the object generation unit 14 is sequentially searched one by one, and the same serial number as the received message serial number is used. Check if there is. If there is the same serial number in this determination, the retransmitted message is a message for which the object generation processing has already been completed, so it is determined to be a redundant message. On the other hand, if there is no message with the same serial number, it is determined that the message is not a redundant message because the message has not been processed yet.

In this way, when the redundant transmission detection unit 11 detects a redundant transmission message, the object generation unit 14 does not execute the object generation processing without complying with the request of the received message, and the response message transmission unit 20 , And sends a response message indicating that the processing is completed to the service request unit 2. On the contrary, when the redundant transmission detecting unit 11 detects that the message is not a redundant transmission message, the object generating unit 14 executes the generation processing of the designated object according to the request of the received message, and the response message transmitting unit 20 A response message is sent at the end of the generation process.

Further, when the received message uses the generated object, the redundant transmission detection unit 11 directly checks the message sequence number storage unit 18 provided in the object management unit 17 of the data processing unit 15 specified by the message. , Check whether the received message has the same serial number as the serial number. If the same serial number is determined in this determination, the retransmitted message is a message for which processing has already been completed, so it is determined to be a redundant message. On the contrary, when the serial numbers are not the same, it is determined that the message is not a redundant message because the message has not been processed yet.

In this way, when the redundant transmission detection unit 11 detects that the message is a redundant transmission, the data processing unit 15 does not perform the data processing without complying with the request of the received message, and the response message transmission unit 20 A response message indicating that the processing is completed is transmitted to the service request unit 2. vice versa,
When the redundant transmission detection unit 11 detects that the message is not a redundant transmission message, the data processing unit 15 executes the designated data processing according to the request of the received message, and the response message transmission unit 20 ends at the end of this processing. Send a reply message.

According to the present invention, a serial number is added to the transmitted message by the message serial number adding device 3, and the message serial number storage unit 18 stores the serial number of the message for which the service processing has been completed by the message serial number setting unit 19. . From now on, the redundant transmission detecting unit 11 compares the stored serial number with the serial number of the received message,
By checking whether or not the message is a redundant message, it is possible to prevent inconvenience such as duplicate execution of service processing. Moreover, when the message is related to object generation, it is determined whether or not it is necessary to enter the serial number search by first checking whether or not the re-transmission display is attached, so that the long search is performed. It is possible to minimize the determination of the identity of the serial number of the object generator 14 that requires time,
It becomes possible to efficiently judge whether or not the message is a redundant message.

〔Example〕

 Hereinafter, the present invention will be described in detail according to examples.

FIG. 2 shows a system configuration diagram of the present invention. First in the figure
The same components as those described in the figures are denoted by the same symbols. 1a is a server program corresponding to the service providing unit 1 in FIG. 1, 2a is a user program corresponding to the service requesting unit 2 in FIG. 1, and 5 is a received message received by the server program 1a.

As the service processing executed by the server program 1a,
Broadly divided, there are generation processing of the object 16 (processing of generating an object and passing the usage right to the user program 2a) and data processing using the generated object 16. From now on, there are two types of messages that the user program 2a sends to the server program 1a: a request for generation processing of the object 16 and a data processing request using the generated object 16. Since the request to generate the object 16 is a request to generate a new object 16, it can be requested without any limitation. On the other hand, the data processing request using the generated object 16 is subject to the generation of the object 16 and the transfer of the usage right for the object 16. From now on, these two types of messages transmitted from the user program 2a will be sent to the server program 1a through different reception ports.
Will be received by. Therefore, the server program 1a
Will be able to automatically know which kind of message the received message belongs to.

The message serial number addition device 3 and the retransmission display addition device 4 newly provided in the present invention are prepared on the system side regardless of the user program 2a. As described with reference to FIG. 1, when the user program 2a sends a message, the message sequence number addition device 3 processes so as to add a unique message sequence number to the transmitted message, and retransmits the message. When the user program 2a retransmits the same message, the display addition device 4 performs processing so as to add a retransmission display indicating that the message is to be retransmitted to the transmitted message. Here, when the same message is retransmitted, the message sequence number addition device 3 processes so as to add the same message sequence number as the previous message. Further, the retransmission display added by the retransmission display addition device 4 may be in any expression format as long as it indicates the presence or absence of retransmission.

In this way, the message sequence number is added by the message sequence number addition device 3 and the retransmission display is added by the retransmission display addition device 4, so that the server program 1a
In the received message 5 received in step 1, the added message sequence number and retransmitted message are described, as shown in the figure.

Next, the process for detecting redundant transmission of a message, which is executed by the present invention, will be described with reference to the flowcharts shown in FIGS. The flowchart of FIG. 3 is
4 is a flowchart executed when the received message 5 is related to an object generation processing request, and the flowchart of FIG. 4 is a flowchart executed when the received message 5 is related to a data processing request.

First, the flowchart of FIG. 3 will be described. In step 1, when it detects that a message has been received,
In the subsequent step 2, it is determined whether or not the received message 5 received is retransmitted. When it is determined that the retransmitted message is not attached by this determination, since the received message 5 is not retransmitted because it is not retransmitted, the process proceeds to step 3, and the process instructed by the received message 5 is performed. The object generation processing is executed and the usage right is passed to the user program 2a. Then, in the next step 4, in order to indicate that the message has been generated by the object generation process,
The attached message serial number is stored in the message serial number storage unit 18 of the object management unit 17 of the generated object 16, and in the next step 7, a processing end response message is transmitted to the user program 2a for processing. finish.

On the other hand, if it is determined in step 2 that the retransmitted message is displayed, the received message 5 is retransmitted, so there is a possibility that it is a redundant transmission. Therefore, the process proceeds to step 5.
The message sequence numbers stored in the message sequence number storage unit 18 of the object management unit 17 of the object 16 generated up to that time are searched in order, and the received message 5
It is determined whether or not the same message serial number is stored. If it is determined in this determination that the same message sequence number does not exist, the retransmitted received message 5 is not a redundant message, so the process proceeds to step 3 and the object generation process is started according to the received message 5. Become. On the contrary, when it is determined that the same message serial number is present, the received message 5 retransmitted is a redundant message that has already been processed, and therefore, as shown in the next step 6, In step 7, the processing end response message is transmitted and the processing is ended without performing the above processing.

In this way, by comparing the message sequence number of the received message 5 with the message sequence number of the message sequence number storage unit 18, it is searched whether or not the received message 5 is a redundant message. The processing of the received message 5 is performed so as not to be executed. In the process of detecting the redundant transmission, the search process is executed without using the retransmission display provided by the retransmission display addition device 4 even though there is no possibility of the redundant transmission, so that this search requiring a long processing time is performed. There is no unnecessary execution of the processing.

Next, the flowchart of FIG. 4 will be described. When it is detected in step 11 that the message has been received, in the following step 12, the message serial number storage section of the object management section 17 of the object 16 designated by the received message 5
The message serial number stored in 18 is read, and it is determined whether or not it is the same message serial number as the received message 5. If it is determined in this determination that the received message 5 is not the same message serial number, the retransmitted received message 5 is not a redundant message, so the process proceeds to step 13 and the data processing that is the process instructed by the received message 5 is performed. Is executed, and in the following step 14, the message sequence number storage unit of the object management unit 17 of the object 16 is displayed in order to indicate that the message has been processed.
The attached message serial number is stored in 18, and in the next step 16, a process termination response message is transmitted to the user program 2a to terminate the process. On the other hand, when it is determined in step 12 that the message numbers are the same, the received message 5 that has been retransmitted is a redundant message that has already been processed.
As shown by, the process for the received message 5 is not performed at all, and the process termination response message is transmitted in step 16 to terminate the process.

In this way, as in the case of the message regarding the object generation processing, by comparing the message sequence number of the received message 5 with the message sequence number of the message sequence number storage unit 18, whether the received message 5 is a redundant message or not. Check if there is a message 5
That is, the processing is performed so as not to be executed. The third
Unlike the flowchart in the figure, when the received message 5 is related to a data processing request, one message serial number storage unit 18 for checking whether it is a redundant transmission is specified, so it is not necessary to see the resend display. is there.

〔The invention's effect〕

As described above, according to the present invention, it is possible to check whether or not the message received according to the message sequence number is a redundant message. From now on, problems such as duplicate execution of service processing will not occur. Moreover, it becomes possible to efficiently realize whether or not this is a redundant transmission.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of the system of the present invention, FIGS. 3 and 4 are flowcharts executed by the present invention, and FIG. 5 is an explanatory diagram of the configuration of the prior art. FIG. 6 is an explanatory view of the problems of the prior art. In the figure, 1 is a service providing unit, 1a is a server program, 2
Is a service request unit, 2a is a user program, 3 is a message serial number addition device, 4 is a retransmission display addition device, 5 is a received message, 10 is a message reception unit, 11 is a redundant transmission detection unit, 12
Is a retransmission display detection unit, 13 is a service processing unit, 14 is an object generation unit, 15 is a data processing unit, 16 is an object, 17
Is an object management section, 18 is a message serial number storage section, 19
Is a message serial number setting part, 20 is a response message sending part,
21 is a message transmission unit.

Claims (1)

[Claims] 1. Data processing, comprising: a service providing unit (1) for executing a predetermined service process; and a service requesting unit (2) for sending a service request message to the service providing unit (1). In the device, when the service request unit (2) executes message transmission, the message sequence number adding device (3) for adding a serial number for identification to a transmitted message and the service request unit (2) are in an abnormal state. A retransmission display adding device (4) for adding a retransmission display to the transmitted message when the same message is retransmitted due to occurrence, and the service providing unit (1) includes the service requesting unit (2). A message that stores the serial number attached to the message in object units when the corresponding service processing is completed according to the message from The service providing unit (1) is configured to include a serial number storage unit (18), and when the received message relates to object generation, there is a retransmission display by the retransmission display addition device (4). As a condition, processing is performed so as to detect whether or not the message is a redundant message by searching the message serial number storage unit (18), and when the received message uses the generated object, A redundant message of a data processing device characterized by being processed to detect whether or not the message is a redundant message by checking the message serial number storage unit (18) of the object specified by the message. Detection processing method.