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When the DllHost.exe executable runs, COM+ creates one instance of each component that implements the IProcessInitializer interface and invokes the Startup method. This instance is kept alive until the DllHost process is terminated, and when this happens, COM+ invokes its Shutdown method. Because the object lives for the entire application lifetime, you can store values in shared private fields, and possibly make them available to other objects in the applications by means of shared members. If the application contains multiple components that implement this interface, the order in which their Startup and Shutdown methods are called is unpredictable. The IProcessInitializer interface works correctly only with server COM+ applications, because library applications don t launch a new instance of the DllHost executable. This interface is available under Windows 2000 Service Pack 3 and later, but it is fully working only under COM+ 1.5. Read MSDN articles Q319776 and Q303890 for more details about this feature.

Version 1.5 of COM+ has several new features that can greatly improve the scalability and robustness of your applications, especially if they re running under Windows Server 2003. In previous chapters, I have described some of these new features for example, configurable isolation levels and new accounts under which a COM+ server application can run but there is more to be covered. Only a fraction of these features can be configured in code by means of attributes; in all other cases, you ll have to activate them manually from inside the MMC snap-in or by authoring an administrative script.

Important For security reasons, COM+ network access is initially disabled under Windows Server 2003, so you can use COM+ components only locally. To verify that network access is enabled, open the Add/Remove Windows Components dialog box of Control Panel, select Application Server, click the Details button, and verify that the Enable Network COM+ Access option is selected.

Many of the publications you create by using Publisher will include the same personal or company information, such as a name, an address, and a phone number. Instead of having to enter this information for each new publication, you enter it only once, in an information set. Then whenever a new publication includes an item from the information set, Publisher automatically pulls it from the stored record and plugs it in. Similarly, to update personal or company information throughout the publication, you need only update it once, in the information set. In this exercise, you will create two information sets and apply them to a publication. USE the Logo publication. This practice le is located in the Documents\Microsoft Press\ SBS_Publisher2007\GettingStarted folder. d BE SURE TO close any open publications and display the Getting Started window before beginning this exercise.

By default, all the requests for components in a given COM+ server application are hosted in a single instance of the DllHost process. COM+ 1.5, however, lets you create a pool of two or more host processes that serve the same application, up to the number you specify on the Pooling & Recycling tab of the application s Properties window. (See Figure 31-12.) When the maximum number of processes has been reached, subsequent client requests are dispatched to the existing processes, using a round-robin algorithm.

Part VII:

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Application pooling provides a way to improve isolation among components: if a com ponent crashes, only the DllHost instance that hosts the component is shut down; clients served by the other instances aren t affected. Application pooling is also useful for legacy single-threaded COM components. All such components are created in the main SingleThread Apartment (STA) of a given process, which tends to negatively affect perfor mance. Creating multiple hosting processes can reduce this performance penalty. Application pooling has a few limitations too. For example, a COM+ application that runs as an NT service can t use application pooling. Also, you can t use the Shared Property Manager (SPM) to share data among all the instances of a given component because the SPM can t span multiple processes. In general, you should never assume that two instances of a given component run in the same process. (Read the MSDN documentation for more information about the SPM.) When you shut down a pooled application from the MMC snap-in, COM+ terminates all the DllHost instances that are serving that application. Similarly, when you manually start a pooled application from the snap-in, COM+ creates a number of processes equal to the pool size. (Conversely, when the application is started by a client request, only one process is initially created.)

One recurring complaint from developers (and end users) is that COM+ applications have a tendency to degrade performance in the long run. In many cases, the blame belongs to the developers themselves as this performance degradation is typically caused by bugs, memory leaks, or unreleased resources but this surely doesn t help solve the problem.

31:

1. In the Publication Types list, click Business Cards, and then under Newer Designs,