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Overview

The Microsoft™ Component Object Model (COM) is a component software architecture that allows developers to partition an application into multiple components that can be developed and installed independently of each other. COM is the underlying architecture that forms the foundation for higher-level software services, like those provided by OLE (Object Linking and Embedding). OLE services span various aspects of component software, including compound documents, custom controls, interapplication scripting, data transfer, and other software interactions. Using COM allows software objects to be reused for a variety of applications. Because of its binary standard, COM allows any two components to communicate regardless of the language in which they were written.

The Microsoft Distributed Component Object Model (DCOM) is an extension of COM, and supports communication among objects residing on different computers; LANs, WANs, and the Internet. With DCOM, these software objects can be reused over a distributed Environment.

DCOM Architecture

The following figure depicts the architecture of Distributed COM

Development Information

• Features
  • Outbound Communication - should be able to invoke an operation exposed by COM component
  • Inbound Communication - should be able to register for COM Events and listen to those events
  • Transactions - participate in Global transactions offered by MTS
  • Security - invoke operations using different types of security levels present in COM world
• JavaOne Milestone
  • As a consumer, consume simple service exposed by COM Component.

WSDL Extensibility Elements

The following is the description of the DCOM Binding Component extensibility elements:

DCOM Demos

The following demo shows the simple usage of DCOM BC, here we request a echo method which returns the same value which we send as input.

• DCOM Echo Demo

Dependencies

• J-Interop: DCOMBC depends on j-Interop to interface with COM servers. j-Interop(open source), implements DCOM wire protocol and is written purely(void of native code) in Java hence can be used from all platforms so supported.

Download Binaries

• Download Design time artifacts
• Download Runtime installer

References

For more insight into Distributed COM please go through

• Distributed COM

Disclamer: DCOM is a trademark of Microsoft, this reference is from Microsoft Library - http://msdn.microsoft.com/library

Documents

Some of the following documents are written using OpenOffice. Download it and try it out.

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This page (revision-20) was last changed on 23-Jul-07 23:38 PM, -0700 by Nav.
This page was created on 13-Mar-07 06:39 AM, -0700 by chandrakanthb.

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