Method, system and program product for automatically ensuring compatability of a code module loaded into a program-code environment

• US 20060161910A1
• Filed: 01/14/2005
• Published: 07/20/2006
• Est. Priority Date: 01/14/2005
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Emmes, David B., Webb, Alan M., Candee, Juliet C., Greenspan, Steven J., Bonsteel, Roger E., Czukkermann, John L., Knight, Joshua W.
• Application Number:
  US11/035,538
• Publication Number:
  US 20060161910A1
• Time in Patent Office: Days
• US Class Current: 717/170
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
• CPC Class Codes: G06F 9/44536 Selecting among different versions

Abstract

An approach for automatically ensuring compatibility of a requested code module for a program-code environment is provided in which the requested code module provides an indication of at least one compatible operating system version which can execute the requested code module. This indication is automatically compared to version information of a currently-running operating system of the program-code environment when the currently-running operating system loads the requested code module. Compatibility of the requested code module is ensured upon the automatic comparison establishing agreement between the indication and the version information of the currently-running operating system. In another aspect, when the requested code module is to be loaded in response to a request to access the requested code module, a code-module version requirement of a requesting code module is automatically compared to version information of the requested code module to ensure compatibility of the requested code module.

Claims

1. A method of automatically ensuring compatibility of a requested code module for a program-code environment, the method comprising:

(i) providing by a requested code module an indication of at least one compatible operating system version, the requested code module being executable by the at least one compatible operating system version; and

(ii) automatically comparing the indication to version information of a currently-running operating system of a program-code environment when the currently-running operating system loads the requested code module, wherein compatibility of the requested code module is ensured upon the automatically comparing establishing agreement between the indication and the version information of the currently-running operating system.

2. The method of claim 1, wherein the requested code module is to be loaded in the program-code environment in response to a request by a requesting code module to access the requested code module, and the method further comprises (iii) automatically comparing a code-module version requirement of the requesting code module and version information of the requested code module, wherein compatibility of the requested code module is ensured upon, additionally, the automatically comparing (iii) establishing compatibility of the code-module version requirement of the requesting code module and the version information of the requested code module.

3. The method of claim 2, wherein the requesting code module requests a particular interface version of the requested code module, and the automatically comparing (iii) further comprises determining whether the requested code module is capable of providing the particular interface version.

4. The method of claim 3, wherein the requested code module dynamically constructs the particular interface version requested by the requesting code module.

5. The method of claim 3, wherein the particular interface version is defined by a program communications area provided by the requested code module, and the method further comprises (iv) checking a validity of the program control area, wherein compatibility of the requested code module is ensured upon, additionally, the checking establishing the validity of the program communications area with respect to a format specification therefor provided by the currently-running operating system.

6. The method of claim 2, wherein the requesting code module requests a particular interface version of the requested code module;

the method further comprises (v) automatically comparing a program-module version requirement of the currently-running operating system to version information of the particular interface version; and

compatibility of the requested code module is ensured upon, additionally, the automatically comparing (v) establishing compatibility of the particular interface version and the currently-running operating system.

7. The method of claim 2, wherein the requested code module exports a plurality of interfaces in a program communications area provided by the requested code module;

the requesting code module requests a particular interface of the plurality of interfaces exported; and

the automatically comparing (iii) further comprises determining whether a currently-loaded version of the requested code module is capable of providing the particular interface.

8. A system of automatically ensuring compatibility of a requested code module for a program-code environment, the system comprising:

(i) means for providing by a requested code module an indication of at least one compatible operating system version, the requested code module being executable by the at least one compatible operating system version; and

(ii) means for automatically comparing the indication to version information of a currently-running operating system of a program-code environment when the currently-running operating system loads the requested code module, wherein compatibility of the requested code module is ensured upon the automatically comparing establishing agreement between the indication and the version information of the currently-running operating system.

9. The system of claim 8, wherein the requested code module is to be loaded in the program-code environment in response to a request by a requesting code module to access the requested code module, and the system further comprises (iii) means for automatically comparing a code-module version requirement of the requesting code module and version information of the requested code module, wherein compatibility of the requested code module is ensured upon, additionally, the means for automatically comparing (iii) establishing compatibility of the code-module version requirement of the requesting code module and the version information of the requested code module.

10. The system of claim 9, wherein the requesting code module requests a particular interface version of the requested code module, and the means for automatically comparing (iii) further comprises means for determining whether the requested code module is capable of providing the particular interface version.

11. The system of claim 10, wherein the requested code module dynamically constructs the particular interface version requested by the requesting code module.

12. The system of claim 10, wherein the particular interface version is defined by a program communications area provided by the requested code module, and the system further comprises (iv) means for checking a validity of the program control area, wherein compatibility of the requested code module is ensured upon, additionally, the means for checking establishing the validity of the program communications area with respect to a format specification therefor provided by the currently-running operating system.

13. The system of claim 9, wherein the requested code module exports a plurality of interfaces in a program communications area provided by the requested code module;

the requesting code module requests a particular interface of the plurality of interfaces exported; and

the means for automatically comparing (iii) further comprises means for determining whether a currently-loaded version of the requested code module is capable of providing the particular interface.

14. At least one program storage device readable by a machine embodying at least one program of instructions executable by the machine to perform a method of automatically ensuring compatibility of a requested code module for a program-code environment, the method comprising:

(i) providing by a requested code module an indication of at least one compatible operating system version, the requested code module being executable by the at least one compatible operating system version; and

(ii) automatically comparing the indication to version information of a currently-running operating system of a program-code environment when the currently-running operating system loads the requested code module, wherein compatibility of the requested code module is ensured upon the automatically comparing establishing agreement between the indication and the version information of the currently-running operating system.

15. The at least one program storage device of claim 14, wherein the requested code module is to be loaded in the program-code environment in response to a request by a requesting code module to access the requested code module, and the method further comprises (iii) automatically comparing a code-module version requirement of the requesting code module and version information of the requested code module, wherein compatibility of the requested code module is ensured upon, additionally, the automatically comparing (iii) establishing compatibility of the code-module version requirement of the requesting code module and the version information of the requested code module.

16. The at least one program storage device of claim 15, wherein the requesting code module requests a particular interface version of the requested code module, and the automatically comparing (iii) further comprises determining whether the requested code module is capable of providing the particular interface version.

17. The at least one program storage device of claim 16, wherein the requested code module dynamically constructs the particular interface version requested by the requesting code module.

18. The at least one program storage device of claim 16, wherein the particular interface version is defined by a program communications area provided by the requested code module, and the method further comprises (iv) checking a validity of the program control area, wherein compatibility of the requested code module is ensured upon, additionally, the checking establishing the validity of the program communications area with respect to a format specification therefor provided by the currently-running operating system.

19. The at least one program storage device of claim 15, wherein the requesting code module requests a particular interface version of the requested code module;

the method further comprises (v) automatically comparing a program-module version requirement of the currently-running operating system to version information of the particular interface version; and

compatibility of the requested code module is ensured upon, additionally, the automatically comparing (v) establishing compatibility of the particular interface version and the currently-running operating system.

20. The at least one program storage device of claim 15, wherein the requested code module exports a plurality of interfaces in a program communications area provided by the requested code module;

the requesting code module requests a particular interface of the plurality of interfaces exported; and

the automatically comparing (iii) further comprises determining whether a currently-loaded version of the requested code module is capable of providing the particular interface.