System for cooperative communication between local object managers to provide verification for the performance of remote calls by object messages

• US 5,377,350 A
• Filed: 04/30/1993
• Issued: 12/27/1994
• Est. Priority Date: 04/30/1993
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Skinner, Harold R.
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): AMSBURY, WAYNE P
• Application Number:
  US08/056,120
• Time in Patent Office: 606 Days
• Field of Search: 395/200, 395/575, 395/600, 395/650, 395/700
• US Class Current: 719/316
• CPC Class Codes: G06F 9/548 Object oriented; Remote method invocation [RMI] non-remote method invocation G06F9/449

Abstract

Object managers on different computing platforms communicate with each other in a cooperative manner, while allowing the objects on the computing platforms to communicate with each other using a remote procedure call which preserves the object oriented characteristics of data independence and encapsulation. Preferably, each object manager indicates to the other object manager whether local objects have successfully responded to remote messages. The object manager can thereby preserve integrity of the object oriented system by committing or rolling back the system in response to completion of specific tasks or failure to complete specific tasks, even though some of the tasks occurred outside the local object oriented computing environment.

Claims

1. An object oriented cooperative data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects, each including associated data and at least one method; and

a first object manager including means for directing action messages between said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects, each including associated data and at least one method; and

a second object manager including means for directing action messages between said plurality of second objects; and

means for communicatively connecting said first computing environment and said second computing environment;

said first object manager further comprising;

means for identifying a first action message from one of said first plurality of objects which is directed to one of said second plurality of objects; and

means, responsive to said identifying means, for transmitting said first action message to said one of said second objects via said connecting means;

said second object manager further comprising;

means for determining whether said one of said second objects successfully performed said first action message; and

means, responsive to said determining means, for providing to said first object manager an indication of whether said one of said second objects successfully performed said first action message.

2. The object oriented cooperative data processing system of claim 1 wherein said second object manager further comprises:

second means for identifying a second action message from one of said second plurality of objects which is directed to one of said first plurality of objects; and

means, responsive to said second identifying means, for transmitting said second action message to said one of said first objects via said connecting means; and

wherein said first object manager further comprises;

second means for determining whether said one of said first objects successfully performed said second action message; and

second means, responsive to said second determining means, for providing to said second object manager an indication of whether said one of said first objects successfully performed said second action message.

3. The object oriented cooperative data processing system of claim 1 wherein said first object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said second providing means further comprises means for providing to said first object manager a unit-of-work identification associated with said one of said second objects, along with said indication of whether said one of said second objects successfully performed said first action message.

4. The object oriented cooperative data processing system of claim 2 wherein said second object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said providing means further comprises means for providing to said second object manager a unit-of-work identification associated with said one of said first objects, along with said indication of whether said one of said first objects successfully performed said second action message.

5. The object oriented cooperative data processing system of claim 1 wherein each of said indications comprises one of a successful completion code and an error code.

8. The object oriented cooperative data processing system of claim 1 wherein each of said indications comprises one of a successful completion code and an error code.

6. An object oriented cooperative data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects; and

first means for managing said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects; and

second means for managing said plurality of second objects; and

means for communicatively connecting said first computing environment and said second computing environment;

said first object managing means comprising;

first means for indicating to said second object managing means, whether successful performance by said first objects of messages from said second objects has occurred; and

first means for receiving from said second object managing means, indications of whether said second objects successfully performed messages from said first objects;

said second object managing means comprising;

second means for indicating to said first object managing means, whether successful performance by said second objects of messages from said first objects has occurred; and

second means for receiving from said first object managing means, indications of whether said first objects successfully performed messages from said second objects.

7. The object oriented cooperative data processing system of claim 6:

wherein said first object managing means further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work; and

wherein said first indicating means further comprises means for indicating to said second object managing means a unit-of-work identification associated with said one of said first objects, along with said indication of whether said one of said second objects successfully performed messages from said first objects; and

wherein said second object managing means further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work; and

wherein said second indicating means further comprises means for indicating to said first object managing means a unit-of-work identification associated with said one of said second objects, along with said indication of whether said one of said first objects successfully performed messages from said second objects.

9. An object oriented cooperative data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects, each including associated data and at least one method; and

a first local object manager including means for directing action messages between said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects, each including associated data and at least one method; and

a second local object manager including means for directing action messages between said plurality of second objects; and

means for communicatively connecting said first computing environment and said second computing environment;

said first object oriented computing environment further comprising;

a first client stub for identifying a first action message from one of said first plurality of objects which is directed to one of said second plurality of objects; and

a first conversation server, responsive to said first client stub, for transmitting said first action message to said one of said second objects via said connecting means;

said second object oriented computing environment further comprising a second conversation server for determining whether said one of said second objects successfully performs said first action message, and for providing to said first local object manager an indication of whether said one of said second objects successfully performed said first action message.

10. The object oriented cooperative data processing system of claim 9 wherein said second object oriented computing environment further comprises:

a second client stub for identifying a second action message from one of said second plurality of objects which is directed to one of said first plurality of objects; and

wherein said second conversation server is responsive to said second client stub, for transmitting said second action message to said one of said first objects via said connecting means; and

wherein said first conversation server further comprises means for determining whether said one of said first objects successfully performs said second action message, and for providing to said second local object manager an indication of whether said one of said first objects successfully performed said second action message.

11. The object oriented cooperative data processing system of claim 10 wherein said first local object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said second conversation server further comprises means for providing to said first local object manager a unit-of-work identification associated with said one of said second objects, along with said indication of whether said one of said second objects successfully performed said first action message.

12. The object oriented cooperative data processing system of claim 11 wherein said second local object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said first conversation server further comprises means for providing to said second local object manager a unit-of-work identification associated with said one of said first objects, along with said indication of whether said one of said first objects successfully performed said second action message.

13. The object oriented cooperative data processing system of claim 10 wherein each of said indications comprises one of a successful completion code and an error code.

14. An object oriented cooperative data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects; and

first means for managing said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects; and

second means for managing said plurality of second objects; and

means for communicatively connecting said first computing environment and said second computing environment;

said first object managing means comprising;

first remote procedure calling means for directing action messages from said plurality of first objects to said plurality of second objects; and

first means for cooperatively communicating with said second object managing means, independent of said first remote procedure calling means;

said second object managing means comprising;

second remote procedure calling means for directing action messages from said plurality of second objects to said plurality of first objects; and

second means for cooperatively communicating with said first object managing means, independent of said second remote procedure calling means.

15. A method for providing cooperative processing in an object oriented data processing system, said object oriented data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects, each including associated data and at least one method; and

a first object manager including means for directing action messages between said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects, each including associated data and at least one method; and

a second object manager including means for directing action messages between said plurality of second objects; and

means for communicatively connecting said first computing environment and said second commuting environment;

said cooperative processing method comprising the following steps performed by said first object manager;

identifying a first action message from one of said first plurality of objects which is directed to one of said second plurality of objects; and

transmitting said first action message to said one of said second objects via said connecting means;

said cooperative processing method further comprising the following steps performed by said second object manager;

determining whether said one of said second objects successfully performed said first action message; and

providing to said first object manager an indication of whether said one of said second objects successfully performed said first action message.

16. The method of claim 15 wherein the following steps are also performed by said second object manager:

identifying a second action message from one of said second plurality of objects which is directed to one of said first plurality of objects; and

transmitting said second action message to said one of said first objects via said connecting means; and

wherein the following steps are also performed by said first object manager;

determining whether said one of said first objects successfully performed said second action message; and

providing to said second object manager an indication of whether said one of said first objects successfully performed said second action message.

17. The method of claim 15 wherein said first object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said providing step comprises the step of providing to said first object manager a unit-of-work identification associated with said one of said second objects, along with said indication of whether said one of said second objects successfully performed said first action message.

18. The method of claim 16 wherein said second object manager further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work;

and wherein said second object manager providing step comprises the step of providing to said second object manager a unit-of-work identification associated with said one of said first objects, along with said indication of whether said one of said first objects successfully performed said second action message.

19. The method of claim 15 wherein each of said indications comprises one of a successful completion code and an error code.

20. A method for providing cooperative processing in an object oriented data processing system, said object oriented data processing system comprising:

a first computing platform;

a first object oriented computing environment executing on said first computing platform, said first object oriented computing environment comprising;

a plurality of first objects; and

first means for managing said plurality of first objects;

a second computing platform;

a second object oriented computing environment executing on said second computing platform, said second object oriented computing environment comprising;

a plurality of second objects; and

second means for managing said plurality of second objects; and

means for communicatively connecting said first computing environment and said second computing environment;

said cooperative processing method comprising the following steps performed by said first object managing means;

indicating to said second object managing means, whether successful performance by said first objects of messages from said second objects has occurred; and

receiving from said second object managing means, indications of whether said second objects successfully performed messages from said first objects;

said cooperative processing method comprising the following steps performed by said second object managing means;

indicating to said first object managing means, whether successful performance by said second objects of messages from said first objects has occurred; and

receiving from said first object managing means, indications of whether said first objects successfully performed messages from said second objects.

21. The method of claim 20:

wherein said first object managing means further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work; and

wherein said second object managing means indicating step indicating further comprises the step of indicating to said second object managing means a unit-of-work identification associated with said one of said first objects, along with said indication of whether said one of said second objects successfully performed messages from said first objects; and

wherein said second object managing means further comprises means for assigning selected ones of said first objects and selected ones of said second objects to a unit-of-work; and

wherein said second object management means indicating step further comprises the step of indicating to said first object managing means a unit-of-work identification associated with said one of said second objects, along with said indication of whether said one of said first objects successfully performed messages from said second objects.

22. The method of claim 20 wherein each of said indications comprises one of a successful completion code and an error code.