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Use the Microsoft Transaction Server (COM+)

 

COM+ (Microsoft Transaction Server) is designed to help users run business logic applications in a typical middle tier server. COM+ divides work up into activities, which are typically short independent chunks of business logic, such as transfer funds from account A to account B. COM+ relies heavily on object orientation and in particular on COM; loosely a COM+ activity is represented by a COM (business) object.

COM+ is an integrated part of the operating system. To use COM+ on Windows 2000 and Windows XP, we need Hotfix Q313582 (also known as COM+ Rollup Package 19.1).

COM+ provides three services to the business object administrator, removing much of the worry from the business object programmer:

You usually use COM+ with front end code that is a COM client to the objects held within COM+, and back end services such as a database, with WebSphere MQ bridging between the COM+ business object and the back end.

The front end code can be a standalone program, or an Active Server Page (ASP) hosted by the Microsoft Internet Information Server (IIS). The front end code can reside on the same computer as COM+ and its business objects, with connection through COM. Alternatively, the front end code can reside on a different computer, with connection through DCOM. You can use different clients to access the same COM+ business object in different situations.

The back end code can reside on the same computer as COM+ and its business objects, or on a different computer with connection through any of the WebSphere MQ supported protocols.

For detailed information on using COM+, including how to configure it, and how to develop your applications and object code, read the WebSphere MQ COM+ Component Services Support part of the WebSphere MQ Help Center.

 

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Scenario 2: Other software provides the coordination


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