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Running Business Objects in Component Services

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Important

Beginning with Windows 8 and Windows Server 2012, RDS server components are no longer included in the Windows operating system (see Windows 8 and Windows Server 2012 Compatibility Cookbook for more detail). RDS client components will be removed in a future version of Windows. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Applications that use RDS should migrate to WCF Data Service.

Business objects can be executable files (.exe) or dynamic-link libraries (.dll). The configuration you use to run the business object depends on whether the object is a .dll or .exe file:

  • Business objects created as .exe files can be called through DCOM. If these business objects are used through Internet Information Services (IIS), they are subject to additional marshaling of data, which will slow client performance.

  • Business objects created as .dll files can be used through IIS, and therefore also by HTTP. They can also be used over DCOM only through Component Services, or through Microsoft Transaction Server, if you are using Windows NT. Business object DLLs will need to be registered on the IIS server computer to access them through IIS. For information about how to configure a DLL to run on DCOM, see the section, Enabling a DLL to Run on DCOM.

Note

When business objects on the middle tier are implemented as Component Services components by using GetObjectContext, SetComplete, and SetAbort, the business objects can use Component Services (or MTS, if you are using Windows NT) context objects to maintain their state across multiple client calls. This scenario is possible with DCOM, which is typically implemented between trusted clients and servers in an intranet. In this case, the RDS.DataSpace object and CreateObject method on the client side are replaced by the transaction context object and CreateInstance method, which are provided by the ITransactionContext interface and implemented by Component Services.

See Also

RDS Fundamentals