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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Service orientation in the .NET Framework as exposed via the ASMX call stack lends a lot of power and flexibility to your application design and development process. Web Services, as they ship with the .NET Framework, create a seamless, attribute-based model for exposing methods on your classes as service operations. You can use the WSDL generation features of ASMX, or you can take control of our WSDL and its underlying XML Schema and have a server-side interface defining the service generated for you, and then simply create a class that implements the interface. Version 2.0 adds many new features to the ASMX call stack, including the ability to control the XML used to represent your types in a SOAP message, and customize the types created during proxy generation. When you need greater interoperability you can extend the features added to the ASMX stack using Web Services enhancements, which provide implementations of many specifications in the WS-* family of Web Service architecture. This add-on package of technology affects the behavior of both the server-side processing pipeline and the client-side proxy generation.
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Enterprise Services
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he hosting environment that was originally shipped as Microsoft Transaction Server (MTS) has a lot of names nowadays. Some call it Component Services. Some call it Enterprise Services. Some prefer the brevity of just COM+. Whatever you call it, Component Services is the original aspect-oriented application server for Windows. Support for Component Services has been extended into the .NET Framework, so even though it s still a COM-based technology, you can create types in .NET that can be configured and hosted in the COM+ environment. In this chapter we ll take a look at the features provided by this hosting environment, and then examine what you do exactly to create .NET types that can benefit from this feature set.
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Component Services
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Component Services provides a hosting environment and configuration registry for exposing software assets as services. Originally called Microsoft Transaction Server, these services were designed to be exposed in an RPC manner via DCOM. Over time, it became as common (if not more common) to leverage configured components from Internet Information Server (IIS). This was the standard architecture for ASP-based applications. Creating COM types and hosting them as configured services in COM+ provided many benefits, including compiled code (as opposed to interpreted script) and a type system (as opposed to one type: the VBScript Variant). Figure 7-1 shows the original common architectures. Many powerful features of Component Services worth leveraging from managed code still exist. Support for running managed code within the COM environment of COM+ is accomplished via highly specialized interoperability code that has been added to the Component Services infrastructure. Because of this, not just any .NET type can be configured and hosted in this environment. Not only do you need to make special considerations for the design of these types, but the types must also inherit from a special base class and adhere to special run-time behaviors.
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CHAPTER 7 ENTERPRISE SERVICES
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Figure 7-1. The original common architectures for Component Services We ll take a look at how support for Component Services is grafted onto the .NET Framework over the course of the chapter. First, let s take a quick look at why you would be tempted to create configured components in the first place. Table 7-1 lists some of the features of COM+. Table 7-1. Features You Can Leverage from the Components Services Hosting Environment
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COM+ Feature
Thread Management
Meaning in Life
COM+ allocates thread pools to manage higher loads and service many requests concurrently. Combined with Just-in-Time Activation (JITA) and object pools, COM+ can greatly reduce the overhead of object instantiation and destruction, and can effectively manage object lifetimes in a highly scalable environment. Leveraging the features of the Microsoft Distributed Transaction Coordinator (MSDTC), types can be made to have their work participate in transactions declaratively. That is, transactional behavior becomes an aspect of the type, in many cases eliminating the need for special considerations while coding. Transactions can also be managed across disparate servers, even across different database vendors. This feature set creates a perfect layer of abstraction between a developer and Message Queuing (MSMQ). Method calls become messages, benefiting your code by making your method calls asynchronous, which provides peak load balancing and guaranteed delivery. All of the details of creating a message, putting it in a queue, and processing it on the receiver are managed by the hosting environment. Applications, classes, and even methods can be declared as requiring the executing user be in a predefined role. This is declarative security, eliminating the need to modify imperative code to meet your authorization requirements.
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