Providing binding options for component interfaces

• US 6,799,320 B1
• Filed: 12/16/1998
• Issued: 09/28/2004
• Est. Priority Date: 12/16/1998
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Elvanoglu, Ferhan, Chronister, Benjamin L., Lucas, Terry L.
• Primary Examiner(s): An, Meng-Al T.
• Assistant Examiner(s): ANYA, CHARLES E
• Application Number:
  US09/212,717
• Time in Patent Office: 2,113 Days
• Field of Search: 709/310-332, 719/331, 717/145-148, 717/153, 717/162
• US Class Current: 719/331
• CPC Class Codes: G06F 9/449 Object-oriented method invocation or resolution

Abstract

A proxy component system having dispatch proxies and object proxies is disclosed. The computerized system includes an operating system supporting component interfaces. In addition, the system includes a first interface to a target component, with the first interface having an early bound method. The system further includes a second interface to a proxy component, with the second interface having a late bound method. Also included in the system is a dispatch proxy operative to invoke the early bound method of the first interface from an invocation of the late bound method of the second interface.

Claims

1. A computer system for transparently interfacing a client component with a target component, the system comprising:

(a) a client component operable to communicate with target components;

(b) a target component having an interface; and

(c) an interfacing component operable to;

(i) obtain the identity of the target component from the client component;

(ii) analyze the target component to determine whether the client component is operable to directly communicate through the target component'"'"'s late bound interface, wherein the direct communication is between a client object and a target object;

(iii) return the target component'"'"'s interface to the client component if the client component can directly communicate with the target component'"'"'s interface; and

(iv) return the interface of a proxy component to the client component if the client component cannot directly communicate with the target component'"'"'s interface, the proxy component'"'"'s interface capable of directly communicating with the client component causing the proxy component to pose as the target component to the client component.

2. The system of claim 1, wherein the proxy component analyzes methods in the target component'"'"'s interface and creates corresponding methods in the proxy component'"'"'s interface, such that when the interface of the proxy component receives a call from the client component, the proxy component makes a corresponding call in the target component'"'"'s interface.

3. The system of claim 2, wherein the proxy component further translates parameters from a format received with calls to methods in the proxy component'"'"'s interface to a format appropriate for calls to the target component'"'"'s interface, and passes the translated parameters with the corresponding method calls in the target component'"'"'s interface.

4. The system of claim 3, wherein the proxy component further translates return values from calls to the target component'"'"'s interface to a format suitable for return values from the corresponding method calls on the proxy component'"'"'s interface, and returns the translated return values to the client component when returning from method calls on the proxy component'"'"'s interface.

5. The system of claim 4, wherein the proxy component creates proxy objects for objects returned from calls to the target component'"'"'s interface, and returns the proxy objects to the client component when returning from corresponding calls on the proxy component'"'"'s interface.

6. The system of claim 1 further comprising a force proxy property, wherein if the force proxy property is set to a first value, the interfacing component returns a proxy component'"'"'s interface to the client component, irrespective of whether the client component can directly communicate with the target component'"'"'s interface.

7. The system of claim 1, wherein the target component is a COM (Component Object Module) compatible component.

8. The system of claim 1, wherein the proxy component is a COM (Component Object Module) compatible component.

9. The system of claim 1, wherein the client component is a scripting component operable to obtain a script file comprising a plurality of instructions to be performed on the target component, and wherein the scripting component is operable to translate the plurality of instructions in the script file into method calls for the target component.

10. The system of claim 1, wherein the target component implements an early bound interface, or a late bound interface, or both.

11. The system of claim 10, wherein the proxy component implements a late bound interface in which the proxy component creates methods corresponding to methods in the target component'"'"'s interface.

12. A method for transparently providing an interface for a target component to a host application, comprising:

obtaining the identity of a target component having an interface;

determining whether the host application can directly communicate with through the target component'"'"'s late bound interface, wherein the direct communication is between a client object and a target object; and

if the host application can directly communicate with the target component'"'"'s interface, returning the target component'"'"'s interface to the host application;

otherwise

generating a proxy component that poses as a target component, said proxy component having an interface with which the host application can directly communicate, and returning the proxy component'"'"'s interface to the host application.

13. The method of claim 12, further comprising the proxy component analyzing the methods in the target component'"'"'s interface and creating corresponding methods in the proxy component'"'"'s interface, such that when a call is received in the proxy component'"'"'s interface, the proxy component transparently makes a corresponding call in the target component'"'"'s interface.

14. The method of claim 13, further comprising the proxy component translating parameters received in a call to the proxy component'"'"'s interface to a format suitable for a corresponding call to the target component'"'"'s interface, and passing the parameters with the corresponding call to the target component'"'"'s interface.

15. The method of claim 14, further comprising the proxy component translating a return value of the call to the target component'"'"'s interface to a format suitable as a return value of a corresponding call to the proxy component'"'"'s interface, and returning the translated return value to the host application.

16. The method of claim 15, further comprising the proxy component creating proxy objects for objects returned from calls to the target component'"'"'s interface, and returning the proxy objects to the host application as objects returned from a corresponding call to the proxy component'"'"'s interface.

17. The method of claim 12, further comprising testing a force proxy property for a first value, and if the force proxy property is the first value, generating a proxy component which poses as a target component, said proxy component having an interface with which the host application can directly communicate, and returning the proxy component'"'"'s interface to the host application irrespective of whether the host application can directly communicate with the target component'"'"'s interface.

18. The method of claim 12, wherein the proxy component is a COM (Component Object Module) compatible component.

19. The method of claim 12, wherein the target component is a COM (Component Object Module) compatible component.

20. The method of claim 12, wherein the host application is a scripting application for obtaining a script file comprising a plurality of instructions to be performed on the target component, and the method further comprising processing the plurality of instructions in the script file into method calls for the target component.

21. The method of claim 12, wherein the target component implements an early bound interface, a late bound interface, or both.

22. The method of claim 21, wherein the proxy component implements a late bound interface.

23. A computer-readable medium having computer readable instructions capable of performing the method recited in claim 12.