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Client Server Systems

COM Beyond Microsoft: Designing and Implementing COM Servers by Terence Sherlock

By Terence Sherlock

* First ebook on a arguable subject severely very important to many huge enterprises * Authors are between few in with suitable adventure the 1st e-book to explain how Microsoft's part item version (COM) will be supported on computers except home windows. Drawing on Compaq's groundbreaking paintings of porting COM/DCOM to its OpenVMS and Tru64 UNIX Alpha systems, COM past Microsoft explains how the COM ordinary may also help organisations combine their functions throughout a heterogeneous computing setting. This e-book info the cutting edge COM aid now local on Tru64 UNIX and OpenVMS and divulges how builders can take advantage of COM on OpenVMS and COM on Tru64 UNIX to create moveable software program elements that run nearly unchanged on OpenVMS, Tru64 UNIX, home windows NT, home windows 2000, and different significant computing structures.

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Batch processing programs are well suited to user interface encapsulation. Applications that do screen management (for example, SMG or FMS) could have their older charactercell interface encapsulated using COM, providing users access through newer Windows NT style dialog boxes or through a web interface. Database If you choose to encapsulate a database using COM, the database could be accessed from parts of a distributed application running on other platforms. The advantage of this approach is that the programmer can keep the database on the server system, Chapter 4.

Finally, the developers add code to the COM server that allows it to read in the ASCII report data and reformat it to a comma-delimited form suitable for reading into Excel. Figure 17 shows this new architecture. Figure 17. Drew Corporation: VP's access Client Server Existing application Terminal Interface Function1 COM client COM server (wrapper) Function2 Function3 VB input Reports Excel reports COM-11 This solution allows the Drew Corporation to continue to use its existing application with no modifications, and it extends the application’s accessibility by providing a Windows GUI for the VP to generate and review his report.

The application must have callable routines that can be logically mapped to a new front end (Windows- or web-based). If you’re not sure which integration method is right for you, BridgeWorks includes an online Knowledgebase to help you decide. BridgeWorks assumes a three-tier model. BridgeWorks encapsulates applications on an OpenVMS VAX or Alpha system and creates COM business logic for the second tier. You can then create a COM client for the first tier that communicates with the COM business logic on the second tier.

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