Resource adapter classloading

• US 20070113234A1
• Filed: 11/17/2005
• Published: 05/17/2007
• Est. Priority Date: 11/17/2005
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: BEA Systems Incorporated (Oracle Corporation)
• Inventors: Chesebro, Brian, Chinnappa, Codanda, Gish, James
• Granted Patent: US 7,788,660 B2
• Time in Patent Office: Days
• US Class Current: 718/104
• 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 9/541 via adapters, e.g. between incompatible applications

Abstract

In accordance with embodiments, there are provided mechanisms and methods for loading a class with a resource adapter classloader and enabling the class to be accessible by other components that interconnect with the resource adapter. In an embodiment, a method for loading a class with a resource adapter classloader is provided that includes detecting an indicator specifying that at least one class loaded by a classloader associated with a resource adapter be made accessible to at least one other classloader. The at least one class loaded by the classloader associated with the resource adapter is made accessible to a system classloader. The at least one other classloader is permitted the capability to access the at least one class loaded by the classloader associated with the resource adapter via the system classloader.

Claims

1. A method for loading a class with a resource adapter classloader, the method comprising:

detecting an indicator specifying that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader;

making the at least one class loaded by the classloader associated with the resource adapter accessible to a system classloader; and

permitting at least one other classloader the capability to access the at least one class loaded by the classloader associated with the resource adapter via the system classloader.

2. The method of claim 1, wherein detecting an indicator specifying that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader, comprises:

detecting that a tag indicating that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader has been set to true.

3. The method of claim 1, wherein making the at least one class loaded by the classloader associated with the resource adapter accessible to a system classloader, comprises:

loading the class using the classloader associated with the resource adapter; and

providing access to the added class independent of a CLASSPATH associated with the system classloader.

4. The method of claim 3, wherein loading the class using the classloader associated with the resource adapter comprises:

loading the class into a cache using the classloader associated with the resource adapter.

5. The method of claim 3, wherein providing access to the added class independent of a CLASSPATH associated with the system classloader comprises:

providing access to the added class to an augmentable system classloader associated with the system classloader.

6. The method of claim 1, wherein permitting at least one other classloader the capability to access the at least one class loaded by the classloader associated with the resource adapter via the system classloader, comprises:

permitting the at least one other classloader access the added class, wherein the added class has been associated with the system classloader.

7. The method of claim 1, further comprising:

organizing the at least one class with other classes according to rules defining a scope for classes associated with each classloader.

8. The method of claim 7, further comprising:

organizing the scope for classes associated with each classloader according to a hierarchy.

9. A machine-readable medium carrying one or more sequences of instructions for loading a class with a resource adapter classloader, which instructions, when executed by one or more processors, cause the one or more processors to carry out the steps of:

detecting an indicator specifying that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader;

making the at least one class loaded by the classloader associated with the resource adapter accessible to a system classloader; and

permitting at least one other classloader the capability to access the at least one class loaded by the classloader associated with the resource adapter via the system classloader.

10. The machine-readable medium as recited in claim 9, wherein the instructions for carrying out the step of detecting an indicator specifying that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader include instructions for carrying out the step of:

detecting that a tag indicating that at least one class loaded by a classloader associated with a resource adapter is to be made accessible to at least one other classloader has been set to true.

11. The machine-readable medium as recited in claim 9, wherein the instructions for carrying out the step of making the at least one class loaded by the classloader associated with the resource adapter accessible to a system classloader include instructions for carrying out the steps of:

loading the class by the classloader associated with the resource adapter; and

providing access to the added class independent of a CLASSPATH associated with the system classloader.

12. The machine-readable medium as recited in claim 11, wherein the instructions for carrying out the step of loading the class using the classloader associated with the resource adapter include instructions for carrying out the step of:

loading the class into a cache using the classloader associated with the resource adapter.

13. The machine-readable medium as recited in claim 11, wherein the instructions for carrying out the step of providing access to the added class independent of a CLASSPATH associated with the system classloader include instructions for carrying out the step of:

providing access to the added class to an augmentable system classloader associated with the system classloader.

14. The machine-readable medium as recited in claim 9, wherein the instructions for carrying out the step of permitting at least one other classloader the capability to access the at least one class loaded by the classloader associated with the resource adapter via the system classloader, include instructions for carrying out the step of:

permitting the at least one other classloader access the added class, wherein the added class has been associated with the system classloader.

15. The machine-readable medium as recited in claim 9, further comprising instructions for carrying out the step of:

organizing the at least one class with other classes according to rules defining a scope for classes associated with each classloader.

16. The machine-readable medium as recited in claim 16, further comprising instructions for carrying out the step of:

organizing the scope for classes associated with each classloader according to a hierarchy.

17. A resource adapter apparatus, the apparatus comprising:

a cache memory;

a classloader to load instances of classes into the cache memory;

a mechanism to detect an indicator specifying that at least one class loaded by a classloader is to be made accessible to at least one other classloader; and

a mechanism for making the at least one class loaded by the classloader into the cache accessible to a system classloader;

thereby enabling permitting at least one other classloader the capability to access the at least one class loaded by the classloader via the system classloader.