Achieving polymorphism in a COM software architecture or the like

• US 6,772,228 B1
• Filed: 09/29/2000
• Issued: 08/03/2004
• Est. Priority Date: 08/16/2000
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Aragona, Daniel
• Primary Examiner(s): COURTENAY III, ST JOHN
• Application Number:
  US09/675,612
• Time in Patent Office: 1,404 Days
• Field of Search: 709/200-203, 719/310-320
• US Class Current: 719/316
• CPC Class Codes: G06F 9/465 Distributed object oriented systems remote method invocation [RMI] G06F9/548
• CPC Class Codes: G06F 9/5027 the resource being a machine, e.g. CPUs, Servers, Terminals

Abstract

A system and method is provided that allows a software application or client to access and utilize new or different functionality so that the application or client may evolve and improve. More specifically, a system and method is provided that allows a client to interoperate with and obtain a result from a derived server having a first functionality based on an existing relationship between the client and a base server having a second functionality. The existing relationship is based on one or more unique identifiers that may be associated with an interface of the base server and which may be used to interoperate with encapsulated data and methods. The system and method includes making one or more unique identifiers associated with the derived server identical to one or more unique identifiers associated with the base server.

Claims

1. A method comprising:

providing a client configured to interoperate with a first server having a first functionality by using a first interface, the first interface having at least one first unique identifier;

providing a second server derived from the first server and having a second functionality and a second interface, the second interface having at least one second unique identifier;

allowing the client to interoperate with the second server and obtain a result based on the second functionality by making the at least one second unique identifier identical to the at least one first unique identifier and replacing the first server with the second server at runtime.

2. The method of claim 1, wherein the first and second servers are COM servers and wherein the at least one first unique identifier and at least one second unique identifier are at least two first UUIDs and at least two second UUIDs, and wherein making comprises editing an IDL file of the second COM server to make at least two second UUID identical to at least two first UUID.

3. The method of claim 2, wherein the result obtained based on the second functionality is obtained without recompiling the client.

4. The method of claim 2, further comprising registering the first COM server in a directory and moving the second COM server to the directory.

5. The method of claim 2, further comprising making a name of the second interface identical to a name of the first interface.

6. The method of claim 2, wherein the first functionality comprises a first set of operations and wherein the second functionality comprises a second set of operations, at least one operation of the second set of operations different from at least one operation of the first set of operations.

7. The method of claim 2, wherein making does not include making a UUID associated with a TypeLibrary of the second COM server identical to a UUID associated with a TypeLibrary of the first COM server.

8. The method of claim 1, wherein prior to making, the client is not operable to obtain a result based on the second functionality by interoperating with the second server.

9. The method of claim 8, further comprising adding properties and methods associated with the first server to the second server.

10. The method of claim 8, further comprising registering the first server in a directory by storing the at least one first unique identifier in a registry, and wherein obtaining a result further includes the client looking for the at least one first unique identifier in the registry.

11. A machine-readable medium having stored thereon data representing sequences of instructions, the sequences of instructions which, when executed by a machine, cause the machine to allow a client configured to interoperate with a first server to interoperate with a second server, the first server having a first functionality and a first interface having at least one first unique identifier, the second server having a second functionality and a second interface having at least one second unique identifier, wherein the instructions causing the machine to allow include instructions causing the machine to make the at least one second unique identifier identical to the at least one first unique identifier and replace the first server with the second server at runtime.

12. The machine-readable medium of claim 11, wherein the first and second servers are COM servers and wherein the at least one first unique identifier and at least one second unique identifier are at least two first UUID and at least two second UUID, and wherein the instructions to make further comprise instructions causing the machine to edit an IDL file of the second COM server to make at least two second UUID identical to at least two first UUID.

13. The machine-readable medium of claim 12, wherein the instructions to allow further comprise instructions causing the machine to allow the client to interoperate with the second server without recompiling the client.

14. The machine-readable medium of claim 13, wherein the instructions to allow further comprise instructions causing the machine to register the first COM server in a directory and move the second COM server to the directory.

15. A system comprising:

a logical memory storing a client configured to interoperate with a first server having a first functionality by using a first interface, the first interface having at least one first unique identifier;

the logical memory further storing a second server derived from the first server and having a second functionality and a second interface, the second interface having at least one second unique identifier; and

a computer system functionally connected with the logical memory and including a processor, the processor to obtain a result based on the second functionality after the at least one second unique identifier is made identical to the at least one first unique identifier and the first server is replaced by the second server at runtime.

16. The system of claim 15, wherein the first and second servers are COM servers and wherein the at least one first unique identifier and at least one second unique identifier are at least two first UUID and at least two second UUID, and wherein the processor obtains the result based on the second functionality after an IDL file of the second COM server is edited to make at least two second UUID identical to at least two first UUID.

17. The system of claim 16, wherein the processor obtains a result based on the second functionality without recompiling the client.

18. The system of claim 17, wherein the processor obtains a result based on the second functionality after the first COM server is registered in a directory and the second COM server is moved to the directory.

19. A method comprising:

providing a client;

providing a base COM server having an interface to interoperate with the client, the base COM server having a first name and the interface having a second name, wherein the base COM server is located in a first directory, and wherein the base COM server has been registered in the first directory by storing at least one first UUID in a registry;

providing a derived COM server with a third name, wherein the derived COM server has an interface having a fourth name, and wherein the derived COM server comprises properties and methods associated with the base COM server;

modifying an IDL file to make a UUID of the interface and a UUID of a class of the derived COM server identical to a UUID of the interface and a UUID of a class of the base COM server;

making identifications of properties and methods of the derived COM server identical to corresponding identifications of properties and methods of the base COM server;

making the third name of the derived COM server identical to the first name of the base COM server; and

obtaining a result at the client based on one or more methods of the modified derived COM server.

20. The method of claim 19, wherein prior to modifying the IDL file the client is able to interoperate with the base COM server when the base COM server is located in the first directory.

21. The method of claim 19, further comprising making the fourth name for the interface of the derived COM server identical to the second name for the interface of the base COM server.

22. The method of claim 19, wherein the third name of the derived COM server is initially the same as the first name of the base COM server.

23. The method of claim 19, wherein a list of methods for the derived COM server is identical to a list of methods for the base COM server.

24. The method of claim 19:

wherein the derived COM server is initially located in a second directory, the second directory different from the first directory; and

further comprising copying the derived COM server from the second directory to the first directory.

25. The method of claim 19, wherein the base COM server and the derived COM server are created using ATL.

26. The method of claim 19, further comprising providing the appearance of polymorphism from the perspective of the client by dynamically selecting among a plurality of derived COM servers at runtime based upon functionality needed by the client.