JP3652878B2 - Transaction synchronous replacement method for secondary load modules - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transaction synchronous replacement method for a secondary load module that controls the timing for reading a secondary load module during transaction processing performed by a computer.
[0002]
[Prior art]
An example of a conventional subload module (Load Module, LM) replacement method is described in JP-A-6-4477. This conventional sub load module replacement method will be described with reference to FIG. The conventional sub load module replacement method includes an online real-time processing system 1 ′ and a console 8.
[0003]
Further, the online real-time processing system 1 ′ includes the entry point pointer 53, the entry point pointer 54, and the sub load module of each of the currently used sub load module and the alternative sub load module replaced with the sub load module. The sub load module replacement management table 5 includes the active sub load module 52 that specifies which one of the sub load modules is to be used, the sub load module calling unit, and the sub load module replacing unit 4.
[0004]
The operation of this conventional sub load module replacement method will be described below.
The sub load module calling means 3 ′ is called from the transaction processing program 2 ′ and rewrites the current sub load module instruction 52 in the sub load module replacement management table 5 to a sub load module that replaces the current sub load module.
[0005]
[Problems to be solved by the invention]
However, the above-described secondary load module replacement method has a drawback in that when a secondary load module is switched during execution of a user transaction, two different old and new secondary load modules are called before and after the switching in one transaction. There is.
[0006]
For this reason, depending on the contents of the logical difference between the old and new sub load modules, the sub load module replacement method described above has a problem in that transaction processing causes logical contradiction in program processing and correct program processing cannot be performed.
[0007]
The present invention has been made under such a background, and the timing of replacing the currently operating secondary load module with a newly prepared secondary load module is matched with the timing of the end of the transaction. The purpose is to provide a transaction synchronous replacement method for a secondary load module that prevents the processing of a mixture of old and new secondary load modules.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, in a transaction synchronous replacement method for a secondary load module used for calling a secondary load module from a transaction processing program, a first storage unit storing the transaction processing program and one secondary load module A request for outputting request information for requesting replacement of the one sub load module with the other sub load module, a second storage unit storing other sub load modules, and a third storage unit storing other sub load modules. Means for designating whether the transaction processing program uses the one subload module or the other subload module based on the request information, and the one subload required by the transaction processing program Module or other secondary load module And calling means for calling the Zureka, and the one sub-load modules used, whether or not substituted with the other sub-load module, whether the calling of the secondary load modules in a transaction processing program Replacement permission means indicated by the replacement permission information, and the calling means refers to the replacement permission information, and if the secondary load module is not called in the transaction processing program, the designation means designates Copying and storing, storing as the replacement permission information that the sub load module has been called in the transaction processing program, determining which sub load module to call based on the copied and stored designation, On the other hand, in the transaction processing program, If conducted out to determine whether calling one of the sub-load module based on designation by the designation unit that copied previously stored thereby, the request means, said one sub-load modules during transaction processing If, when requesting a replacement of the other sub-load modules, the designation means specifies the use of the other sub-load module, the replacement permission information if substitutable, the calling means of said other A sub- load module is called to perform replacement with the one sub-load module.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a transaction synchronous replacement system for a secondary load module according to an embodiment of the present invention. In this figure, 8 is a console, which issues a sub load module replacement command to the online real system 1 by a user operation.
[0012]
The online real-time system 1 includes a storage unit 2, a secondary load module calling unit 3, a secondary load module replacement unit 4, a process specific table initialization unit 9, a secondary load module replacement management table 5, a process specific table 60, a storage unit 71, and a storage. The unit 72 is configured.
[0013]
The storage unit 2 stores a transaction processing program executed by the online real-time system 1. The storage unit 71 stores a sub load module M1. The storage unit 72 stores a sub load module M2.
[0014]
The sub load module replacement management table 5 includes a sub load module name section 51 indicating the file name of the sub load module, an active sub load module instruction section 52 indicating which of the old and new sub load modules is in use, The pointer unit 53 stores a pointer to a new sub load module entrance, and the pointer unit 54 stores a pointer to an old sub load module entrance.
[0015]
The process specific table 60 includes an active sub load module instruction unit 601 and a sub load module called flag 602 for determining whether or not a sub load module has already been called in the transaction processing program. . The process specific table initialization unit 9 sets the sub load module called flag 602 to “OFF” at the start of the transaction.
[0016]
When the secondary load module calling means 3 is called for the first time in the transaction processing program, the secondary load module called flag 602 of the process specific table 60 is “OFF”, so that the active secondary load of the secondary load module replacement management table 5 is set. The module instruction unit 52 is copied to the working sub load module instruction unit 601 of the process specific table 60, and the sub load module called flag 602 is set to “ON”.
[0017]
Further, the secondary load module calling unit 3 refers to the process specific table 60 and calls the old secondary load module 71 from the storage unit 3 in accordance with the working secondary load module instruction unit 601. When the user inputs a command for switching the sub load module from the console 8 by the user, the sub load module replacing means 4 changes the active sub load module instruction section 52 of the sub load module replacement table 5 from the old sub load module M1 to the new sub load. Switch to module M2.
[0018]
Further, the sub load module calling means 3 is configured so that the transaction processing program is the same sub load even if the current sub load module instruction section 52 of the sub load module replacement table 5 is switched from the old sub load module M1 to the new sub load module M2. When a module request is made, the sub load module called flag 602 of the process specific table 60 is “ON”, so the old sub load module M1 is read from the storage unit 71 according to the working sub load module instruction unit 601. .
[0019]
Further, when the load module is requested by a newly generated transaction processing program after the current transaction processing program is terminated, the sub load module calling means 3 resets the process specific table 60 and indicates the current sub load module instruction. Since the new load module M2 is written in the part 601, the new load module M2 is called.
[0020]
Next, an operation example of one embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a flowchart showing the operation of the transaction synchronous replacement method of the sub load module described above. The sub load module calling means 3 is called by the transaction program when the sub load module is called and performs the processing shown in the flowchart of FIG.
[0021]
For example, assume that a transaction processing program is newly generated.
In step A <b> 1, the secondary load module calling unit 3 reads the data of the secondary load module called flag 602 in the process specific table 60. Then, the sub load module calling unit 3 advances the process to Step A2.
[0022]
Next, in step A2, the secondary load module calling unit 3 determines whether the data read from the secondary load module called flag 602 of the process specific table 60 is “ON” or “OFF”. At this time, since it is called for the first time in the transaction processing program, the data read from the sub load module called flag 602 is “OFF”. For this reason, the sub load module calling means 3 advances the process to step A3.
[0023]
Next, in step A 3, the secondary load module calling unit 3 copies the current secondary load module instruction unit 52 in the secondary load module replacement management table 5 to the current secondary load module instruction unit 601 in the process specific table 60. Then, the sub load module calling unit 3 advances the process to Step A4.
[0024]
Next, in step A4, the secondary load module calling unit 3 calls the secondary load module in accordance with the process of copying the current secondary load module instruction unit 52 in step A3 to the current secondary load module instruction unit 601 of the process specific table 60. The flag 602 is set to “ON”. Then, the sub load module calling unit 3 advances the process to Step A5.
[0025]
Next, in step A5, the secondary load module calling unit 3 refers to the process specific table 60 and reads the secondary load module data written in the working secondary load module instruction unit 601. Then, the sub load module calling unit 3 advances the process to Step A6.
[0026]
Next, in step A6, the secondary load module calling unit 3 determines whether the secondary load module data written in the active secondary load module instruction unit 601 indicates either the secondary load module M1 or the secondary load module M2. Make a decision.
[0027]
Here, when the sub load module calling unit 3 determines that the data of the sub load module written in the active sub load module instruction unit 601 indicates the sub load module M1, the process proceeds to step A7.
[0028]
Next, in step A <b> 7, the secondary load module calling unit 3 reads the secondary load module M <b> 1 from the storage unit 71 indicated by the pointer 53. Then, the secondary load module calling unit 3 ends the secondary load module reading process.
[0029]
In step A6, if the secondary load module calling unit 3 determines that the data of the secondary load module written in the active secondary load module instruction unit 601 indicates the secondary load module M2, the process is executed in step A8. Proceed to
[0030]
Next, in step A <b> 8, the secondary load module calling unit 3 reads the secondary load module M <b> 2 from the storage unit 72 indicated by the pointer 54. Then, the secondary load module calling unit 3 ends the secondary load module reading process.
[0031]
In step A2, when the data read from the sub load module call flag 602 is “ON”, the sub load module calling unit 3 advances the process to step A5. After this, since it is the same as the above-mentioned description, description is abbreviate | omitted.
[0032]
Next, the operation of the sub load module replacing unit 4 will be described using the flowchart of FIG.
In step B1, when the user inputs a command for switching the sub load module from the console 8 by the user, the sub load module replacing unit 4 changes the current sub load module instruction unit 52 of the sub load module replacement table 5 to the old sub load module M1. To the new secondary load module M2.
[0033]
Next, the operation of the process specific initialization unit 9 will be described using the flowchart of FIG.
In step C1, the process specific initialization unit 9 sets the secondary load module called flag 602 to “OFF” at the start of the transaction.
[0034]
As described above, the secondary load module calling unit 3 is called when the transaction processing program calls the secondary load module. If this call is the first time, the secondary load module calling means 3 copies the current secondary load module instruction section 52 of the secondary load module replacement management table 5 to the process specific table 60, and determines whether the target secondary load module is new or old. Judgment is made, and the corresponding secondary load module is called.
[0035]
Next, when a sub load module switching instruction is input from the console 8, the sub load module replacement means is activated, and the current sub load module instruction section 52 of the sub load module replacement management table 5 is changed from the old to the new sub load. Rewrite the data to indicate the module.
[0036]
Thereafter, when the same secondary load module is called again by the transaction processing program, the secondary load module calling means 3 calls the corresponding secondary load module according to the data of the working secondary load module instruction unit 601 of the process specific table 60. Therefore, the same sub load module M1 (old sub load module) as that of the previous time can be called.
[0037]
For this reason, the transaction synchronous replacement method for the secondary load module according to the present invention described above is different even if the secondary load module is dynamically replaced during transaction processing. Can be prevented from calling.
[0038]
【The invention's effect】
According to the first aspect of the present invention, in the transaction synchronous replacement method of the secondary load module used for calling the secondary load module from the transaction processing program, the first storage unit storing the transaction processing program and the one secondary storage module Outputs request information for requesting replacement of the second storage module storing the load module, the third storage module storing other sub load modules, and the one sub load module and the other sub load module. Requesting means, and
Based on the request information, the transaction processing program designates whether to use either the one sub load module or the other sub load module, and the one sub load module required by the transaction processing program or the and calling means for calling one of the other sub-load modules, and the one sub-load modules used, whether or not substituted with the other sub-load module call of the sub-load module in transaction processor Replacement permission means indicating whether or not the replacement permission information indicates whether or not, the calling means refers to the replacement permission information, and if the sub load module is not called in the transaction processing program, When the designation by the designation means is copied and stored In the transaction processing program, the fact that the sub load module has been called is stored as the replacement permission information, and it is determined which sub load module is to be called based on the copied and stored designation. If the sub load module is called in the program, it is determined which sub load module is to be called based on the designation by the designation means that has been copied and stored in advance. a secondary load module of the one in, when requesting a replacement of the other sub-load modules, the designation means specifies the use of the other sub-load module, the replacement permission information if substitutable the calling means calls the other sub-load modules, sub loading module of the one To perform the substitution of the Le, it is avoided that one old different sub load module within the transaction is called.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a transaction synchronous replacement system for a secondary load module according to an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the sub load module calling means 3 in the transaction synchronous replacement method of the sub load module of FIG. 1;
FIG. 3 is a flowchart showing the operation of the sub load module replacing unit 4 in the transaction synchronous replacement system of the sub load module of FIG. 1;
4 is a flowchart showing the operation of the process specific table initializing means 9 in the transaction synchronous replacement method of the secondary load module of FIG. 1;
FIG. 5 is a block diagram showing a configuration of a conventional transaction replacement method of a secondary load module.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Online real-time system 2, 71, 72 Memory | storage part 3 Subload module (LM) calling means 4 Subload module (LM) replacement means 5 Subload module (LM) replacement management table 8 Console 9 Process specific table initialization means 51 Sub load module (LM) name section 52 Current sub load module (LM) instruction section 53 Old sub load module (LM) entry point pointer 54 New sub load module (LM) entry point pointer 60 Process specific table 601 Current sub load module ( LM) Instructing unit 602 Sub load module (LM) called flag

Claims (1)

In the transaction synchronous replacement method of the secondary load module used for calling the secondary load module from the transaction processing program,
A first storage unit storing a transaction processing program;
A second storage unit that stores one secondary load module;
A third storage unit for storing other sub load modules;
A management table holding active sub load module information indicating which sub load module of the one sub load module or the other sub load module is used by the transaction processing program;
Sub load module replacement means for replacing the current sub load module information held in the management table based on request information for requesting replacement of the load module used by the transaction processing program;
A called flag that is reset at the start of transaction processing by the transaction processing program and that is set to a predetermined value when the secondary load module is first called in the transaction processing;
A working sub load module instruction means for copying the working sub load module information held in the management table when the called flag is set;
And a calling means for calling the sub-load module in response to a request of the transaction processor,
When the calling means receives a call request of the sub load module by the transaction processing program, the calling means refers to whether or not the predetermined value is set in the called flag, and if the predetermined value is not set A sub load module is called from the second storage unit or the third storage unit based on the active sub load module information held in the management table, and if the predetermined value is set, the active sub load module A transaction synchronous replacement system for a sub load module, wherein the sub load module is called from the second storage unit or the third storage unit based on the active sub load module information held in the instructing means .

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