JPH11238011A - Object moving method and system therefor, distributed object management device and storage medium storing distributed object management program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up communication, to speed up a computer, to increase the number of clients and to easily construct software which realizes a high speed processing corresponding to the change of client software by facilitating the change of an interface between the client and a server in the software of client/server constitution, which sets an object in a constitution unit. SOLUTION: In the method, the object of a server-side is locked (S1) and an object is copied into a client from a server (S2). A processing executed on the server-side is transferred to a client-side. The object of the server or client-side is moved to an opposite side and a proxy for communicating with the moved object is generated in a moving source. A plurality of objects are collectively copied or moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for moving an object, a distributed object management apparatus, and a storage medium storing a distributed object management program. The present invention relates to a method and system for moving an object to enable flexible change of a server and a client in a distributed object management apparatus, a distributed object management apparatus, and a storage medium storing a distributed object management program.

[0002]

2. Description of the Related Art In conventional software of a client-server configuration on a distributed system having objects as constituent units, when implemented using a normal socket communication interface, the interface between the client and the server becomes fixed. To change this, significant changes are needed on both the client and server side.

As a technique similar to the object moving method, there is a smart proxy which is a function of "Orbix" in a distributed object environment. This feature is based on copying objects from the server to the client; if there are multiple copied objects, synchronize updates between them.

[0004]

However, in the above-mentioned means in the smart proxy, there is a problem that data exclusiveness cannot be guaranteed because exclusive control for reference / update operations is not sufficient. Further, since the above-described means cannot handle a plurality of objects at once, there is a problem that a delay in processing occurs when many objects are copied from the server to the client.

[0005] The present invention has been made in view of the above points, and in software having a client-server configuration in which objects are constituent units, it is possible to easily change an interface between a client and a server, thereby increasing the speed of communication. It stores an object moving method and system, a distributed object management device, and a distributed object management program that can easily build software capable of high-speed processing according to changes in client software, speeding up computers, increasing the number of clients. It is intended to provide a storage medium.

[0006]

FIG. 1 is a diagram for explaining the principle of the present invention. According to the present invention (claim 1), in an object moving method in software of a client-server configuration in a distributed system using an object as a unit, an object on a server side is locked (step 1) and an object is transmitted from the server to a client. Is copied (step 2), and the processing executed on the server side is transferred to the client side.

According to the present invention (claim 2), an object on a server or a client is moved to the opposite side, and
Generate a proxy at the source to communicate with the moved object. According to the present invention (claim 3), a plurality of objects are copied or moved collectively.

FIG. 2 is a diagram showing the principle of the present invention. The present invention (claim 4) relates to an object moving system in software of a client-server configuration in a distributed system on a network in which an object is a constituent unit, wherein an object is copied from a server 200 to a client 300; And a distributed object management apparatus 100 having a moving means 10 for locking the object on the side.

According to the present invention (claim 5), in the distributed object management apparatus 100, an object on the server side 200 or the client side 300 is moved to the opposite side, and a proxy for communicating with the moved object is provided as a source. The reverse moving means 20 is generated. The present invention (Claim 6) includes, in the distributed object management apparatus 100, an object aggregation unit 30 that collectively copies or moves a plurality of objects.

[0010] The present invention (claim 7) is a distributed object management apparatus arranged on an object moving system in client / server configuration software in a distributed system having objects as constituent units,
Class management means for managing schema information and method information of an object; object management means for managing a proxy group for communicating with all object groups in the own process and objects moved to another process; and a plurality of objects Object consolidation management means for managing the consolidation information of the objects for moving the objects together, object movement control means for controlling the movement of the objects, and the object or the object for ensuring data consistency when the objects are moved. Exclusive control management means for performing exclusive control for each object aggregation unit,
Communication control means for actually controlling data transfer between processes when an object is moved.

According to the present invention (claim 8), in the object aggregation management means, one object is designated, objects referenced by the object reference attribute of the object are aggregated into the same group, and recursively executed. It includes one object designating means and an aggregated object designating means for designating a plurality of objects and aggregating the plurality of objects into one group.

The present invention (claim 9) stores a distributed object management program installed in a distributed object management apparatus arranged on an object moving system in software of a client / server configuration in a distributed system having objects as constituent units. Object that manages a class management process that manages schema information and method information of an object, and a proxy group that communicates with all the objects in the own process and the objects that have moved to another process. A management process, an object aggregation management process that manages the aggregation information of the objects for moving the plurality of objects together, an object movement control process that controls the movement of the objects, An exclusive control management process that performs exclusive control for each object or aggregation unit of objects to ensure data consistency, and a communication control process that actually controls data transfer between processes when objects are moved And

According to the present invention (claim 10), in the object aggregation management process, a single object is designated, objects referenced by the object reference attribute of the object are aggregated into the same group, and recursively executed. One object designation process and an aggregate object designation process of designating a plurality of objects and aggregating the plurality of objects into one group are included.

As described above, in the distributed object system, in the server / client constructed on the distributed object management apparatus, the object on the server side is moved or copied to the client.
Transfer the process executed on the server side to the client side. Therefore, when the performance of the client computer is improved or the number of clients is increased, the load on the server-side computer can be reduced.

Further, when the client software is changed and the access to a specific object on the server side from the client side increases, the number of times of communication between the client and the server can be reduced.
Conversely, when the performance of the server computer is improved, the load on the client computer can be reduced by moving the client-side object to the server.

Further, by integrating a plurality of objects into one object group, the operation of moving or copying the plurality of objects can be integrated into one operation to reduce the number of times of communication. This makes it possible to easily provide software capable of performing high-speed processing in accordance with high-speed communication and high-speed computers.

[0017]

FIG. 3 is a block diagram showing a case where object movement is applied in a distributed system according to the present invention. The system shown in the figure is a distributed object management apparatus 100 for managing objects of server software 200 and client software 300 on a LAN 400.
A and 100B are connected.

The distributed object management device 100 includes:
As shown in FIG. 4, the configuration includes a class management unit 110, an object management unit 120, an object aggregation management unit 130, an object movement control unit 140, an exclusive control management unit 150, and a communication control unit 160. Class management unit 110
Manages object schema information (attributes) and methods.

The object management unit 120 manages all objects in the process and a group of proxies for communicating with the moved object. The object aggregation management unit 130 manages the aggregation information of objects for moving a plurality of objects together. The object movement control unit 140 controls the object movement.

The exclusive control management unit 150 controls transmission and reception of a communication buffer between the server and the client, and performs exclusive control for each object or each unit of aggregation of the object in order to guarantee data consistency when the object is moved. I do. The communication control unit 130 actually controls data transfer between processes when an object is moved. For communication on the same computer, a socket communication or a communication method using a shared memory is conceivable. Socket communication can be considered for communication between different computers.

Hereinafter, the operation of the distributed object management apparatus 100 that performs the main operation in the present invention will be described. First, the operation of the object management unit 120 will be described. FIG. 5 is a diagram for explaining the operation of the object management unit of the present invention. Object management unit 120
Manages all the objects in the own process and the objects moved to another process. Objects in the own process can be directly accessed in the memory. On the other hand, for the group of objects moved to another process, access is realized via a proxy. The proxy has information about the destination.

More specifically, the object management unit 120
When an object in its own process is accessed (attribute value reference, method execution), the object I
A pointer to an object having a matching object ID is obtained from the array for managing the object group based on D. Then, the reference of the attribute value and the execution of the method are performed based on the information of the pointer.

When the proxy accesses (attribute value reference, method execution), the proxy manages the information of the destination of the object and transmits the object to the destination. And receive the result. Specifically, struct proxy {char * hostid; ID of the destination computer int portid; communication port ID of the destination computer int objectid; destination object ID}. In the above processing, first, the destination computer is specified.

Communication is started to a designated port of the computer, and an object ID and access information are transmitted. The destination computer performs an "access to an object in its own process" process and transmits the result. Receives the result from the destination computer and returns the result.

Next, the operation of the object aggregation management unit 130 will be described. FIG. 6 is a diagram for explaining the operation of the object aggregation management unit of the object management device according to the present invention. There are two methods for defining the aggregation of objects in the object aggregation management unit 130. One is a method of designating one object, assembling objects referenced by the object reference attribute of the object into the same group, and recursively executing this, as shown in FIG. It is. The other is a method of designating a plurality of objects and aggregating them into one group as shown in FIG.

The object aggregation management unit 130
In order to manage the aggregation, internally, a set of object IDs is managed in an array as shown below. As the management procedure of the object aggregation management unit 130,
First, a group of object IDs specified by each of the aggregation methods described above is determined, and then individual object IDs are sequentially set from the top of the array.

Next, the operation of the object movement control section 140 will be described. The object to be moved by the object movement control unit 140 described below is either one object or an aggregated object.
First, an operation at the time of movement when one object is a movement target will be described. When the one object is a moving object, the reference cache changes the locked state of the object on the server side and copies it to the client side. On the client side,
Has only reference authority.

FIG. 7 is a diagram for explaining the operation of the reference cache of the object movement control unit of the object management apparatus according to the present invention. Step 101) The reference cache checks the state of the object to be moved, moves to step 102 if there is no reference lock and no lock, and ends the process as failure if it is update lock.

Step 102) The lock counter is incremented (locked state). Step 103) Transfer the object to be moved to the client. Step 104) Receive the object on the client side. Step 105) An area for storing the transmitted object is prepared, and if the attribute of the object to be copied is an object reference type, a proxy is generated so that the reference destination is the server-side object.

Step 106) A state is set in which the client can only refer to the object. Next, in the update cache, the lock state of the object on the server side is changed and copied to the client side. The client has reference update authority for this copy.

FIG. 8 is a diagram for explaining the operation of the update cache of the object movement control unit of the object management apparatus according to the present invention. Step 201) The state of the object to be moved is checked. If there is no lock, the process proceeds to step 202; otherwise, the process proceeds to step 207 as a failure.

Step 202) The lock counter is incremented (locked state). Step 203) Transfer the object to be moved to the client. Step 204) Receive the object on the client side. Step 205) An area for storing the transmitted object is prepared, and if the attribute of the object to be copied is an object reference type, a proxy is generated so that the reference destination is an object on the server side.

Step 206) The client sets a state in which the object can be updated. Step 207) If it fails in step 201, the lock counter is decremented (unlocked state). Step 208) The client sets a state in which the object can be updated.

When the object is moved, the object movement control unit 140 copies the object to the server or the client, and generates a proxy at the source. That is, when the object is copied from the server to the client, a proxy is generated on the server, and when the object is copied from the client to the server, a proxy is generated on the client.

FIG. 9 is a diagram for explaining the movement operation of the object movement control unit of the object management apparatus according to the present invention. The following example shows a case in which the server moves from the server to the client. Step 301) Transfer the object to be moved to the client. Step 302) Receive an object on the client side.

Step 303) An area for storing the transmitted object is prepared and copied. Step 304) Replace the object with a proxy to communicate with the moved object at the source. Next, an operation of returning the moved object when the above-described one object is set as a movement target will be described.

FIG. 10 is a diagram (reference cache) for explaining the operation of returning the moved object by the object movement control unit of the object management apparatus according to the present invention.
8 shows an operation of returning an object moved by the operation shown in FIG. Step 401) Delete the copy and proxy of the object created when the object was moved.

Step 402) Decrement the lock counter of the object on the server side. FIG. 11 is a diagram (update cache) for explaining the operation of returning the moved object by the object movement control unit of the object management device of the present invention, and shows the operation of returning the moved object by the operation shown in FIG.

Step 501) The copied object is transmitted to the server. Step 502) Receive the object on the server side,
Overwrite server-side objects. Step 503) The lock counter of the object on the server side is set to 0. Step 504) Delete the copy and proxy of the object created when the object is moved on the client side.

FIG. 12 is a diagram (movement) for explaining the operation of returning the moved object by the object movement control unit of the object management apparatus of the present invention, and returns the object moved in FIG. Step 601) Send the moved object to the source side. Step 602) Receive the object on the source side,
Generate as a source object.

Step 603) Delete the proxy generated on the source side. Next, an operation at the time of moving when the aggregated object is a moving target will be described. Basically, the movement at the time of moving one object as described above is performed on the aggregated individual objects, except that a plurality of object groups are collectively transferred. I do. If the moved object has an object reference attribute, if the reference destination is aggregated and transferred, a proxy is not generated and the object in the own process is referred to.

Further, the operation of returning the moved object when the aggregated object is set as the movement target is as follows.
The operation of returning the moved object in the case where one object described above is set as the movement target is performed on each of the aggregated objects.
This is to transfer a plurality of object groups together. Next, the operation of the exclusive control management unit 150 will be described.

FIG. 13 is a diagram for explaining the operation of the exclusive control management unit of the object management apparatus according to the present invention, and shows a state transition of an object for performing exclusive control of the object. There are three types of object states, "no lock" where no copy of the object exists, "reference lock" where there are multiple copies with reference authority, and "update lock" where there is one copy with update authority.
There is.

There are the following six types of object state transitions. Any other transition is not allowed. It is assumed that the numbers in the circles in the figure correspond to the numbers in the following description. "No lock → Reference lock" This is the case where the object on the server side is copied to the client side in order to refer to the object on the client side, and if there is no client with a copy, the object on the server side is locked Transition to the state, and set the lock count to 1.

[Reference Lock → No Lock] In the case where the object copied on the client side is released and there is no other client having the copy, the object on the server side is transited to the state without lock. "No lock → update lock" This is the case where the object on the server side is copied to the client side in order to update the object on the client side, and if there is no client with a copy, the object on the server side is locked Transition to the state.

[Update Lock → No Lock] In the case where the object copied on the client side is released and there is no other client having the copy, the object on the server side is transited to the state without lock. "Reference lock → Update lock" When the object is already copied on the client side with reference authority, and the object is updated on the client side, and there is no client having the copy, the object on the server side is updated lock. State.

[Reference Lock → Reference Lock] This is a case where an object on the server side is copied to the client side in order to refer to the object on the client side, and one or more clients copy the object on the server side and copy the object. If the user has reference authority to the copy, the lock count of the server-side object is increased by one. Alternatively, when the object copied on the client side is released, and when another client copies the object on the server side and has the reference authority to the copy, the lock count of the object on the server side is increased by one. cut back.

Further, the distributed object management device shown in FIG. 4 is constructed as a program, and a disk device connected to a computer used as the distributed object management device or a portable storage medium such as a floppy disk or a CD-ROM. The present invention can be easily realized by storing the program in a storage device and installing it when implementing the present invention.

The present invention is not limited to the above-described apparatus configuration and processing operation, but can be variously modified and applied within the scope of the claims.

[0050]

As described above, according to the present invention, it is possible to easily provide software capable of high-speed communication, high-speed computer processing, and high-speed processing according to software change. The amount of software change work can be reduced, and as a result, it is possible to quickly respond to software user requests.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a configuration diagram when an object moving system is applied in the distributed system of the present invention.

FIG. 4 is a configuration diagram of a distributed object management device of the present invention.

FIG. 5 is a diagram for explaining the operation of the object management unit of the present invention.

FIG. 6 is a diagram for explaining an operation of an object aggregation management unit of the object management device of the present invention.

FIG. 7 is a diagram for explaining an operation of a reference cache of the object movement control unit of the object management device according to the present invention.

FIG. 8 is a diagram for explaining an operation of an update cache of the object movement control unit of the object management device according to the present invention.

FIG. 9 is a diagram for explaining the movement operation of the object movement control unit of the object management device according to the present invention.

FIG. 10 is a diagram (reference cache) for explaining an operation of returning the moved object by the object movement control unit of the object management device of the present invention.

FIG. 11 is a diagram (update cache) for explaining an operation of returning a moved object by the object movement control unit of the object management device of the present invention.

FIG. 12 is a diagram (movement) for explaining an operation of returning a moved object by the object movement control unit of the object management device of the present invention.

FIG. 13 is a diagram for explaining the operation of the exclusive control unit of the object management device of the present invention.

[Explanation of symbols]

Reference Signs List 10 moving means 20 reverse moving means 30 object aggregating means 100 server side object, server software 110 class management section 120 object management section 130 object aggregation management section 140 object movement control section 150 exclusive control management section 160 communication control section 200 client side object, Client software 400 LAN

Claims (10)

[Claims] An object moving method in a client / server configuration software in a distributed system having an object as a constituent unit, wherein an object on a server side is locked, and an object is copied from the server to a client. An object moving method, wherein the executed processing is transferred to the client side. 2. The object moving method according to claim 1, wherein the server or the object on the client side is moved to the opposite side, and a proxy for communicating with the moved object is generated at a movement source. 3. The object moving method according to claim 1, wherein a plurality of objects are copied or moved collectively. 4. An object moving system in a client / server configuration software in a distributed system on a network having objects as constituent units, wherein the objects are copied from a server to a client and the objects on the server side are locked. An object moving system comprising a distributed management object management device having moving means. 5. The distributed object management apparatus has reverse moving means for moving the server or the object on the client side to the opposite side, and generating a proxy for communication with the moved object as a source. The object moving system according to claim 4. 6. The object moving system according to claim 4, wherein the distributed object management device includes an object consolidating unit that collectively copies or moves a plurality of objects. 7. A distributed object management apparatus arranged on an object moving system in software of a client / server configuration in a distributed system having objects as constituent units, wherein the class management means manages schema information and method information of the objects. And object management means for managing a group of proxies for communicating with all objects in the own process and objects moved to another process, and managing aggregate information of objects for moving a plurality of objects together Object movement management means, object movement control means for controlling movement of an object, and exclusive control for each object or object aggregation unit in order to guarantee data consistency when the object is moved And other control management means, during the movement of said object, distributed object management apparatus characterized by comprising a communication control unit that actually controls the data transfer between processes. 8. The single object designating means for designating one object, aggregating the objects referred to by the object reference attribute of the object into the same group, and executing recursively, 8. The distributed object management apparatus according to claim 7, further comprising: an aggregate object designating unit that designates a plurality of objects and aggregates the plurality of objects into one group. 9. A storage medium storing a distributed object management program installed in a distributed object management apparatus arranged on an object moving system in a client / server configuration software in a distributed system having an object as a constituent unit, A class management process that manages the schema information and method information of the object, an object management process that manages a proxy group that communicates with all the objects in its own process and the objects that have moved to other processes, and multiple objects An object aggregation management process that manages the aggregation information of the objects for moving the objects together; an object movement control process that controls the movement of the objects; and data consistency when the objects are moved. An object or an exclusive control management process that performs exclusive control for each aggregation unit of the object to guarantee, and a communication control process that actually controls data transfer between processes when the object is moved. A storage medium storing a distributed object management program as a feature. 10. The single object designation process for designating one object, aggregating objects referenced by the object reference attribute of the object into the same group, and executing the process recursively, 10. The storage medium storing the distributed object management program according to claim 9, further comprising: an aggregate object designation process for designating a plurality of objects and aggregating the plurality of objects into one group.