Dynamic generation of wrapper classes to implement call-by-value semantics

• US 20060107222A1
• Filed: 09/10/2004
• Published: 05/18/2006
• Est. Priority Date: 09/10/2004
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: BEA Systems Incorporated (Oracle Corporation)
• Inventors: Gallagher, William John
• Granted Patent: US 8,881,099 B2
• Time in Patent Office: Days
• US Class Current: 715/762
• CPC Class Codes: G06F 9/541 via adapters, e.g. between incompatible applications
• CPC Class Codes: G06F 9/548 Object oriented; Remote method invocation [RMI] non-remote method invocation G06F9/449

Abstract

A system and method for dynamically generating proxy classes in order to enforce call-by-value semantics between clients and EJBs collocated with a virtual machine. The virtual machine can be a Java virtual machine (JVM) or some other type of virtual machine. The proxy classes are dynamically generated at runtime using dynamic byte code generation. Generated proxies are then interposed between a client and an EJB. The interposition of the generated proxies allows the proxies to intercept communication between the client and the EJB. The dynamically generated wrapper classes may be used in any system wherein a first entity invokes a second entity, wherein the second entity has an interface that can be retrieved or introspected and utilizes call-by-value semantics.

Claims

1. A method for dynamically generating a wrapper class, comprising:

receiving EJB information;

introspecting the EJB; and

generating a wrapper class.

2. The method of claim 1 wherein said receiving EJB information includes:

retrieving EJB information from an EJB deployment descriptor file.

3. The method of claim 2 wherein the EJB information indicates whether the optimization is enabled.

4. The method of claim 1 wherein said introspecting the EJB includes:

determining the EJB interfaces.

5. The method of claim 1 wherein said generating the wrapper class includes:

co-generating the wrapper class at run-time.

6. The method of claim 1 further comprising:

providing a client with a reference to wrapper class.

7. A method for implementing a wrapper class, comprising:

receiving an invocation of an EJB method; and

performing optimization on the parameters to be transferred, the optimization performed being based on the type of parameter.

8. The method of claim 7 wherein said receiving an invocation includes:

receiving an invocation of an EJB method by a client.

9. The method of claim 7 wherein said performing optimization on the parameters includes:

passing the parameter by the wrapper as a reference if the parameter is an immutable parameter.

10. The method of claim 9 wherein the immutable parameter includes an EJB string.

11. The method of claim 7 wherein said performing optimization on the parameters includes:

passing a clone of the parameter by the wrapper if the parameter has a predictable format.

12. The method of claim 11 wherein the predictable format includes a date format.