JPH04314145A - Source unit restoring system - Google Patents

Abstract

PURPOSE:To automate restoration by registering information on a library before a source unit is deleted, and executing the restoration when the source unit can be restored. CONSTITUTION:When a deleted information registering means 3 in a source unit deleting/restoring part 2 receives a deletion request from a text editor or a service program, etc., through a deletion requesting means 1, it registers the directory information of the source unit to be deletred in the deleted information source unit of the source unit library 7. After that, when a user becomes aware of that the deleted the source unit by mistake, and instructs the restoration of the source unit from an input/display device 6, a restoration request accepting means 4 accepts this restoration request, and judges whether the source unit can be restored or not, and if it can be restored, it transfers control to a restoring means 5 so as to restore the source unit. If the source unit instructed to restore can not be restored, the effect is reported to the user through the input/display device 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a source unit recovery method for recovering deleted source units on a library used in a computer system.

0002

[Prior Art] Hundreds of various programs are developed every year in companies that have introduced computer systems.
Most of them are created on a source unit library on an external auxiliary storage device. When creating, modifying, or deleting programs on the source unit library, use a text editor, service program, etc. Source units are deleted for various reasons, but there are cases where source units that should not be deleted are accidentally deleted.

[0003] Conventionally, this type of source unit recovery has been carried out by
If a backup has been taken, it must be restored from that backup, and if there is no backup, it must be manually re-entered from the beginning.

0004

[Problem to be Solved by the Invention] As mentioned above, in the conventional source unit recovery method, if a user accidentally deletes a source unit, it can be recovered if a backup has been taken, but if the backup is If it is not available, the only option is to restore it manually, which is extremely painful work.

An object of the present invention is that even if a source unit has been deleted, the user can only use the name of the source unit as long as the area in the library where the source unit was stored is not reused. If you give a command to restore the source unit, it will automatically restore the source unit.

[0006]

[Means for Solving the Problems] The source unit recovery method of the present invention registers information on the library before deletion of the source unit when a source unit deletion request is received from a user and deletion is performed. It has a deletion information registering means, a restoration request receiving means for accepting a restoration request for a deleted source unit, and a restoring means for performing restoration when restoration is possible.

[0007]

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

FIG. 1 is a block diagram showing an embodiment of a source unit recovery method according to the present invention.

Referring to FIG. 1, this embodiment includes a deletion requesting means 1, a source unit deletion/recovery section 2, a deletion information registration means 3, a restoration request receiving means 4, a restoration means 5, an input/display device 6, and a source unit deletion/recovery section 2. It consists of 7 unit libraries.

When the deletion information registration means 3 of the source unit deletion/recovery section 2 receives a deletion request from a text editor, a service program, etc. from the deletion request means 1, the deletion information registration means 3 stores the directory information of the source unit to be deleted in the source unit library. 7 in the deletion information source unit.

[0011] Thereafter, when the user realizes that the source unit has been deleted by mistake and instructs the recovery of the source unit from the input/display device 6, the recovery request receiving means 4 accepts the recovery request and the recovery is possible. If it is possible to recover, control is passed to the recovery means 5 to recover the source unit. If the source unit for which restoration has been instructed cannot be restored, the user is notified through the input/display device 6 that the source unit cannot be restored.

FIG. 2 shows the structure of the source unit library 7, which is divided into a directory section and a data section 9. The directory section 8 stores the name of the source unit and the block start address and block end address of the data section in which actual data is stored.

The data section 9 is managed block by block.
Only data of the same source unit is stored in a block, and if the data cannot be stored in one block, another block is used and the blocks are connected by pointers. A plurality of blocks used in one source unit are not necessarily consecutive because blocks are reused.

FIG. 3 shows the structure of one directory entry (
Directory information 10) is shown. Directory information 10
is composed of a source unit name, a source unit ID (identifier) unique in the source unit library, a data block start address, a data block end address, a revision number, and other information.

FIG. 4 shows the structure of the data section (deletion information 11) of the deletion information source unit. Deletion information 11
consists of the date/time of deletion and all directory information.

FIG. 5 shows a flowchart of the deletion information registration means 3. In FIG. 5, first, when a source unit deletion request is received from a text editor, a service program, etc., the directory information of the source unit requested to be deleted is read (step 51). The current date/time is then obtained from the system (step 52). Directory information is added to the date/time, and this is additionally registered as one data in the deletion information source unit on the source unit library.

FIG. 6 shows a flowchart of the recovery requesting means 4. In FIG. 6, first, a restoration request is accepted from the input/display device (step 61), and information with the same source unit name is stored in the deletion information source unit in the library with the specified source unit name. A search is made to see if there is a person there (step 62).

If the source unit information does not exist, a message indicating that the source unit information to be restored does not exist is displayed (step 6).
3) This means ends. If it exists, obtain the data block start address from the deletion information of the source unit (
Step 65) and obtain the corresponding data block (Step 66).

Source unit ID in data block (
identifier) and stores it in the SUID field on the main memory (step 67). Compare the end address of the data block and the address of the block currently being read (
Step 68), if they are equal, this means is terminated and control is passed to the recovery means. If they are not equal, get the next data block from the pointer to the next data block (step 6).
9).

The source unit ID in the data block is compared with the SUID saved in the main memory (step 7).
0), if they are equal, the process branches to step 68 and the process continues. If they are not equal, a message indicating that the source unit is already in an unrecoverable state is displayed and the procedure ends.

FIG. 7 shows a flowchart of the restoration means 5. Figure 7
First, data of deletion information 11 is registered in the directory (step 71). Deletion information Delete the data related to the corresponding source unit in the source unit (
Step 72). After that, this means ends.

[0022]

[Effects of the Invention] As explained above, the present invention enables automatic recovery of a source unit accidentally deleted by a user without the need for recovery from a backup or manual recovery if there is no backup. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the source unit recovery method of the present invention.

[Figure 2] Diagram showing the structure of the source unit library

[Figure 3] Diagram showing the structure of directory information

[Figure 4] Diagram showing the structure of deletion information

[Figure 5] Flowchart of information registration means

[Figure 6] Flowchart of recovery request acceptance means

[Figure 7] Flowchart of recovery measures

[Explanation of symbols] 1 Deletion request means 2 Source unit deletion/recovery section 3 Deletion information registration means 4 Recovery request acceptance means 5 Recovery means 6 Input/display device 7 Source unit library 8 Directory section 9 Data section 10 Directory information 11 Deletion information

Claims (1)

[Claims] [Claim 1] Deletion information registration means for registering information on a library before deletion of a source unit when a source unit deletion request is received from a user and deletion is performed, and recovery of the deleted source unit. A source unit recovery method having a recovery request receiving means for accepting a request, and a recovery means for carrying out recovery when recovery is possible.