Configuring the Application as a Service in .NET

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COM+ 15 has a new feature that allows Enterprise Service applications to be offered as a Windows service With NET 11, you cannot define a Windows service for the application using attributes, but you can use the admin components to make a Windows service from an existing application With Windows services, you have the advantage that the application can start immediately when the system starts Another advantage is that you send service control requests to the service, which the service reacts to in a custom way Listing 13-4 shows how you can create a Windows service First you must instantiate the COMAdminCatalog component to get access to the ICOMAdminCatalog2 interface This COM interface offers the method CreateServiceForApplication, which configures the application as a Windows service The first parameter is the identifier of the application, the second parameter the name of the service You then specify the start type of the services, error control, dependencies, username, password, and whether the service is allowed to interact with the desktop For the start type of the service, you can define whether the service should start automatically when the system starts (value SERVICE_AUTO_START) or whether you want to start it manually (valueSERVICE_DEMAND_START) For the dependencies, you can set whether other services must be started before this service can start
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Listing 13-4 Creating a Windows Service
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ICOMAdminCatalog2 catalog = new COMAdminCatalog();
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catalogCreateServiceForApplication(
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"{27B91DB8-E9F8-4BF5-88D2-22143DBAC978}", "DemoService", "SERVICE_DEMAND_START", "SERVICE_ERROR_NORMAL",
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Summary
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You have several different options when deploying Enterprise Services applications The easiest optionautomatic deploymenthas its use only in a development environment To install the application with a production server, you need to create a Windows Installer package You can use NET attributes to define how the Installer package is configured You can also use NET classes to register the application, in particular the class RegistrationHelperTx, allowing custom programs to configure applications Despite all the NET attributes, there are still some options left that you cannot do with NET, but you can use COM interop for these scenarios To get access to the complete catalog information from NET applications, you can use an RCW to access the COM component COMAdminCatalog
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Use the utility gacutil to install the assembly into the global assembly cache The global assembly cache is discussed in 2, "Object Activation and Contexts" Role-based security is discussed in 12, "Security" Configuration of the server is discussed in 5, "Networking" In 11, "Loosely Coupled Events," admin components are used to create transient subscriptions with loosely coupled events You can also use the command-line utility tlbimpexe to reference the COM DLL comadmindll in the directory <windows>\<system32>\com Runtime callable wrappers (RCWs) are discussed in 4, "COM Interop"
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14 The Future of Distributed Applications
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Now that you have read s 1 through 13, you know about the existing services that are offered by NET Enterprise Services It is time to take a look into the future This chapter examines upcoming technologies and how you can prepare your current application architectures for a smooth migration So far in this book, XML Web services have been used as a front end to Enterprise Services Web services primarily are based on messages, whereas Enterprise Services is founded on object orientation Of course, these two technology aspects fit together well, but you have also seen some issues where the root of Enterprise ServicesCOM technologycomes up One example is queued components, where a COM moniker must be used to write messages to the message queue The successor of Enterprise Services is not based on COM, but integrates Web services Indigo is the codename of a new communication technology of Microsoft that will be delivered after the release of NET 20 Indigo will integrate the features from ASPNET Web services, NET remoting, and NET Enterprise Services within one product Specifically, this chapter covers the following topics:
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