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Only use the attributes from the Enterprise Services assembly that you really need. Each of the features we ve looked at is configured with attributes. Each incurs some overhead. Leaving a component unconfigured for a given feature means no overhead will be incurred for leveraging that feature. Be conscious and deliberate about which of these you need. For production deployments, you should always use Regsvcs.exe to register your Serviced Components in COM+. Lazy registration is a convenient feature, but one that should only be enjoyed during development. Regsvcs.exe will automatically put your Serviced Components into the Global Assembly Cache (GAC). While this is convenient, any assemblies your Serviced Component is dependant upon will not enjoy the same convenience. This could cause a problem at runtime. For this reason, your deployment should also explicitly register your components and their dependencies in the GAC.
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CHAPTER 7 ENTERPRISE SERVICES
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Component Services exposes a rich set of features that you can consume from .NET by having your types inherit from ServicedComponent and decorating your types with attributes that determine how they ll be configured when they re registered with COM+. Because this is still a COM-based technology, a layer of interop is used; therefore, you must be sure the benefits of the features you re leveraging outweigh the performance hit you ll incur by using the environment. Many of the features of COM+, when needed, will be worth this performance hit. Once your components are created and configured within COM+, calling processes will need to get to them. This may happen in process from IIS, it may happen via DCOM from a Windows Forms application, or it may happen via Web Services. In the next chapter, we ll examine some of the different options that are available for invoking Serviced Components from within different application architectures.
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CHAPTER
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ou use a lot of the services, available at different tiers, to define autonomous pieces of your application. How you build them determines the public interface exposed by those services. You may use interface types to describe these services, or you may use a public standard such as Web Service Description Language (WSDL). Once services are written, deciding how to expose those services to other layers, which may or may not span different physical tiers of your application, is another, somewhat separate, set of decisions. Some of the technologies we ve looked at in this book are coupled to a particular mechanism for exposing them. For example, creating Web Services by decorating your methods with the WebMethod attribute couples them to using WSDL for metadata, schema for type definition, and SOAP for invocation. However, you must keep in mind that someone could still add a reference to the assembly where your service is implemented and invoke it in-process. Sometimes the coupling is not nearly as clear. Deciding to leverage the features of Enterprise Services by creating types that inherit from ServicedComponent does not in any way couple those types to a particular method of exposure. They may be created in-process with your ASPX pages, exposed directly as Web Services, or exposed via a remoting listener installed as an NT Service (to name just a few options). A lot of the time people will discuss making a choice between using Remoting, Web Services, or Enterprise Services. We think this choice is artificial; the decision to use any of these technologies is not mutually exclusive from using the others. You can use all three technologies from different contexts to get to the same method on a single type. Further, this is not an exhaustive set of the choices you have. In this chapter, we ll examine some of the different ways these different types of services can be exposed to other logical layers and other physical tiers of your application. The services you select become the plumbing of your application.
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