JPH05342176A - Exclusive control method for shared data - Google Patents

Abstract

PURPOSE:To provide the exclusive control method for shared data so as to deal with job contents for which the structure of,data or the sequence of operations can not be specified in hyper media or the like. CONSTITUTION:In a system to handle non-routine data while connecting plural terminals provided with input/output devices 11a, 11b and computers 12a, 12b for input/output control and a data storage device 13 to store the shared data, one unit of a transaction is regulated based on the case of an input event regardless of the data structure. Namely, when the event is requested from a pointing device or a keyboard to the shared data on the output device of the terminal by a user, the cases are divided based on an event loop for processing the request, and the transaction unit is regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exclusive control method when shared data is visually represented on an output device,
In particular, the present invention relates to an exclusive control method in which the user can intuitively understand when operating the visualized data and does not reduce the operation efficiency.

[0002]

2. Description of the Related Art Conventionally, the transaction defining method for operating shared data on an output device is such that the structure of data to be handled is fixed in a business application program, and Since the operation procedure for (1) can be uniquely fixed, one transaction is determined for each application program based on the data structure / operation procedure to be handled. In addition, as a specific example of this type of method, "C
"olab project (Xerox Palo Alto Research Center)", "multimedia distributed presence conference system: MERMAID (NEC)", etc.

[0003]

In the above-mentioned conventional technique, one unit of transaction is determined by specializing in the contents of application of the application program. in this case,
The structure of data to be accessed and the procedure for manipulating the data are uniquely determined and must be unchanged. However, when dealing with atypical data such as hypermedia, the user can freely define the data structure, so the data structure and operation procedure are not uniquely determined, and the application program It is impossible to determine a transaction unit in a form that is specialized to the business content. An object of the present invention is to improve such problems by using a transaction division method that does not depend on the structure of data to be handled, and to exclude shared data that can handle business contents whose data structure and operation procedure cannot be specified. It is to provide a control method.

[0004]

In order to achieve the above object, an exclusive control method for shared data according to the present invention operates shared data visualized on an output screen of a system that handles atypical data. In this case, when the user requests an event from the pointing device / keyboard or the like for the shared data on the output device of the terminal, the transaction unit is defined based on the event loop for processing the request, for example, When the operation is completed by one event (case 1), the access is executed by defining the processing procedure group generated by the event as one transaction, and the operation consists of the linkage of multiple events, before the end of a series of events. If the target shared data is allowed to change (Case 2-1), the generated event group is retained as local data. At the end, the processing procedure group generated by the event group is defined as one transaction to perform access, and the operation consists of linkage of a plurality of events, and the operation of the target shared data before the series of events ends. When the change is not allowed (Case 2-2)
, Prohibits access to shared data from other terminals when the first event is requested, holds the generated event group as local data, and at the end time, the processing procedure generated by the event group. The feature is that the group is defined as one transaction, the access prohibition of other terminals is released after the access is executed. That is, in a system in which each user refers to an input / output device equipped with an input / output control computer and each input / output control computer can access the shared data group as needed, the user can send an event to the shared data. When making a request, it is divided into the following three cases depending on the content of the event. Case 1: User's operation is completed in one event Case 2: User's operation is composed of multiple events and is not completed in one event Further, Case 2 is divided into the following two types. .. Case 2-1: When allowing other users to change the data that is the operation target before all related events end Case 2-2: Before all related events end When the user is not allowed to change the data to be operated, an example of the case 1 is to erase the displayed text data. In this case, since the user operation is completed in one event, after the event occurs, the processing procedure group generated by the event is defined as one transaction, and the shared data is accessed. Further, as an example of case 2-1, a movement operation of display data using a pointing device or the like can be considered. In this case, the user's operation is linked with a plurality of events, and while a series of events continues to occur, the event group is held as local data and the shared data is not accessed. At this point, the contents of the local data are reflected only on the output device of the user who requested the event. Then, when a series of events ends, the processing procedure group generated by the event group is defined as one transaction, and access to shared data is executed. Further, as an example of case 2-2, editing of text data and the like can be considered. In this case, at the time when the first event is requested by the user's operation, the transaction for setting the exclusive flag for the shared data is executed. When the exclusive flag is set, other users have only the right to refer to the data. After that, while a series of events is continuously requested, the event group is held as local data, and at this point, the content of the local data is reflected only on the output device of the user who requested the event. Then, when a series of events is completed, the process procedure group generated by the event group is used as one transaction to access the shared data, and then the transaction for clearing the exclusive flag is executed to write to another user. Etc. give permission.

[0005]

In the present invention, the transaction unit is specified in a form not specialized for application programs,
Since transactions are separated from each other, exclusive control can be performed when a plurality of terminals share visualized data and operate on the data. For this reason, like when dealing with hypermedia,
It is possible to deal with business contents for which the data structure and operation procedure cannot be specified by a general-purpose method.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the outline of a data processing system according to an embodiment of the present invention. In FIG. 1, each terminal includes an input / output device 11a to 11c composed of a CRT, a keyboard, a pointing device, etc., and an input / output control computer 12a to 12c. Connected. Further, FIG. 1 shows a state in which a plurality of terminals are accessing shared data. When the operator makes an event request for these shared data with a pointing device or keyboard input, the input / output control computers 12a to 12c define one unit of transaction according to the content.

Here, a method (case classification) for defining one unit of transaction according to the contents of the requested event will be described. <Case 1> FIG. 2 is a diagram showing a process when a user operation is completed in one event in one embodiment of the present invention. In this embodiment, while the text data shared between the terminals is displayed on the screen 21 of the input / output device to be operated, the text data is deleted by one character from the current cursor position. In order to
The case where the "elet" key is pressed will be described. In this case, a case is performed from the event of pressing the "delete" key (201), one unit of one transaction is defined (202), and a processing procedure group for deleting one character is executed (203). As a result, the screen 22 in which the designated one character is deleted is displayed.

<Case 2-1> FIG. 3 is a diagram showing a process when the user operation in one embodiment of the present invention is not completed in one event. In FIG. 3, reference numerals 31 to 33 are screens of the input / output device to be operated and show how the screens are changed in response to a user operation. In this embodiment, a case where a "moving" operation is performed by inputting a pointing device with respect to the visualized common data being displayed while the shared text data is displayed on a certain input / output device will be described. First, when the user presses the button of the pointing device to specify the data to be moved as in the screen 31, case classification is performed according to the event contents (301), and then the pointing device is dragged as in the screen 32. Then, when the destination is specified, the changed data during this period is retained as local data (3
02), the intermediate state is displayed. Further, when the user releases the button of the pointing device, one transaction is defined at that time (303), the processing procedure group is executed (304), and the moving operation is completed as shown in the screen 33.

<Case 2-2> FIG. 4 is a diagram showing a process when the user operation in one embodiment of the present invention is not completed in one event. In FIG. 4, reference numerals 41 to 43 are screens of the input / output device to be operated, and show how the screens are changed according to a user operation. In the present embodiment, a case will be described in which text input is performed from the current cursor position while shared text data is displayed. In this case, when a text input event is requested, as in the case of the screen 41, case classification is performed according to the event content (4
01), an occupancy flag is set at that location (402). This is to prevent other users from inputting text at the same place when the text input event is first requested. After that, if there is change data during text input as in the screen 42, the state is retained as local data (403), and when the user requests a decision event of the input text as in the screen 43, 1
A transaction is defined (404), and the generated processing procedure group is executed (405). Then, the occupancy flag is cleared (406). In the present embodiment, event contents are classified into case 1, case 2-1, and case 2-2, and one transaction is defined in accordance with this, whereby exclusive control of shared data visualized on the output device is performed. .. If the system goes down during a series of event requests, the entire event group is invalidated,
The event request is treated as if it was not made.

[0010]

As described above, according to the present invention, it is possible to perform an operation on the shared data visualized on the output device without depending on its data structure and to perform exclusive control.
Therefore, it is possible to deal with the work content for which the data structure and the operation procedure cannot be specified.

[0011]

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a data processing system in an embodiment of the present invention.

FIG. 2 is a diagram showing a process when a user operation is completed in one event according to an embodiment of the present invention.

FIG. 3 is a diagram showing processing in the case where a user operation is not completed in one event in one embodiment of the present invention.

FIG. 4 is a diagram showing a process when a user operation is not completed in one event according to an embodiment of the present invention.

[Explanation of symbols]

 11a I / O device 11b I / O device 11c I / O device 12a I / O control computer 12b I / O control computer 12c I / O control computer 13 Data storage device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Kamiya 1-26 Toranomon, Minato-ku, Tokyo NTT Data Communications Co., Ltd.

Claims (1)

[Claims] 1. A shared data updating method for a system in which a plurality of terminals each having an input / output unit and an input / output control unit are connected to a storage device for storing shared data, and a shared data updating method for handling atypical data is used. When an operation is performed on encrypted shared data, the transaction unit is defined by the case of an input event, and when the operation is completed by one event, the processing procedure group generated by the event is defined as one transaction. Access is performed, the operation consists of multiple events linked together, and the target shared data can be changed before the end of a series of events,
The generated event group is held as local data, and at the end time, the processing procedure group generated by the event group is defined as one transaction to execute access, and the operation consists of a linkage of a plurality of events. If the target shared data is not allowed to be changed before the event ends, access to the shared data from other terminals is prohibited when the first event is requested, and the generated event group is retained as local data. At the end, the processing procedure group generated by the event group is set to 1
An exclusive control method for shared data, which is defined as a transaction, and after the access is executed, the access prohibition of other terminals is released.