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Now that you know how objects can be activated, we can discuss configurations for library and server applications This section covers the advantages/disadvantages of library and server applications, and some more options with application configuration As discussed earlier, a library application is running in the process of the client; a server application is running in its own process Library applications have a big performance advantage With a client accessing the components, there is no need for a process switch, which has overhead, and no COM interop is needed with a NET clientthe components can be accessed directly The disadvantage with library applications is that you cannot share some objects between multiple clients, and the application will be stopped with the client If an ASPNET application is a client of an Enterprise Services component that is configured as a client application, the component is running in the ASPNET runtime process aspnet_wpexe (IIS5) or w3_wpexe (IIS6) This means that if this process is recycled, the application instance is recycled, too All objects running in this application would be lost This should not be a problem with stateless components, but it is with stateful components Server applications run in their own process, dllhostexe, so interprocess communication is always necessary This interprocess communication is done either by using DCOM with COM interop, or with the help of NET remoting In 5, the advantages and disadvantages of these options are discussed You can configure the following options only with server applications:
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Identity The identity defines the user account that is associated with the process of the application The application will have the privileges of this user Windows services Starting with Windows XP and Windows Server 2003, an Enterprise Services application can be offered as a Windows service This way, the application can be started automatically at boot time of the system, and you can control the application with service control commands Application pooling and recycling In addition to Windows services, another new feature with Windows XP and Windows Server 2003 is application pooling and recycling Figure 2-17 shows these configuration options With application pooling, multiple instances of the application are started This helps with scalability, because each client request with stateless components is dispatched to the next process Application recycling helps with stability by offering a quick fix, particularly for native components that need a lot of memory With application recycling, the application can be restarted depending on a lifetime, the memory used, an expiration timeout, or the number of calls
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Figure 2-17 Application pooling configuration
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By configuring application recycling, you can get great reliability for your application No matter if there is a memory leak or the application hangs because of a different reason, with application recycling, the process is restarted automatically without affecting actual clients
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This chapter discussed the foundation of all NET Enterprise Services: the context You have seen that NET Enterprise Services is more than just a renaming of COM+ Services, because NET Enterprise Services already makes inside use of the NET remoting context You created your first Enterprise Services application with a serviced component by deriving a class from the class ServicedComponent, used assembly and class attributes to define the Enterprise Services configuration, and configured this application with manual and dynamic registration This chapter also discussed object activation options, such as JITA and object pooling, and application activation options as a library or server application
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You can read more about COM apartments in 3, "Concurrency" The class RegistrationHelper is discussed in 13, "Deployment and Configuration"
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