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A typed channel is similar to a Web service proxy object, which provides a typed object representation of the Web services WSDL interface. In a similar fashion, a WCF typed channel provides a typed object reference to a messaging endpoint and its associated operations. In order to create a typed channel, you need to first create the Web service and define its methods. This in turn defines a WSDL interface, which you can then extract automatically (for example, you can append WSDL to the Web service URI in order to review the WSDL document). Finally, you can use a code-generation tool to generate a proxy class based on the WSDL file. Today, we have a utility called wsdl.exe. WCF ships with an equivalent utility called WSDLgen.exe. The output of the code-generation utility is the typed channel, which provides a proxy representation of the WSDL interface as a managed object.
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The Service Manager objects do all of the heavy lifting in processing messages and providing the support infrastructure for managing communications. Table 9-1 summarizes the important Service Manager objects and their purpose.
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CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
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Table 9-1. The WCF Service Manager Objects
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Handles listener messages and performs the appropriate actions on the router service environment. Used in a user-mode listener implementation. Provides support for consuming, applying, processing, and generating policy on a specific port. Manages the WCF remoting infrastructure. Creates SendRequestChannel objects through which messages can be sent and replies received. Controls the consumption and application of routing and transport policy. Represents the factory for rules, and through its namespace hierarchy, the associated properties. Controls application security requirements either programmatically or by using application and machine configuration files. Manages the associations between communication channels and service instances; registers services; and produces typed channels to make requests of other services. Represents the base class for a transaction manager. Manages creation and deletion of the participants in a dialog.
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PolicyManager RemotingManager RequestReplyManager RoutingPolicyManager RuleManager SecurityManager ServiceManager
TransactionManager DialogManager
The Service Manager objects work with the Port object as extensions into a processing pipeline for incoming and outgoing messages. Service Managers automatically process messages as long as the associated service method has the appropriate annotations. Figure 9-2 shows the architecture of the port processing pipeline, including Service Managers.
The Port Processing Pipeline: Receive Channel
Processed Message
Incoming Message
RequestReplyManager
RuleManager
Figure 9-2. The port processing pipeline architecture
Transports and Formatters
The transport and formatter layer is the low-level infrastructure that sits below the activity that is occurring in the port processing pipeline. You will rarely need to interact with the transport and formatter layer directly, beyond specifying what the service will support. You can also specify directional message transport information, such as whether a service is receive-only or is enabled for both send and receive operations.
CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
The transport and formatter layer is what enables messages to be moved across the wire. WCF supports a wide range of transport protocols, as shown in Table 9-2, which indicates the associated WCF object that abstracts the transport protocol information. Table 9-2. WCF-Supported Transport Protocols
Protocol
HTTP POP3 SMTP SOAP TCP InProc CrossProc
WCF Object
HttpTransport Pop3Transport SmtpTransport SoapTransport TcpTransport InProcessTransport (on the same machine) CrossProcessTransport (on the same machine)
The transport and formatter layer delegates message serialization (and deserialization) to a dedicated object called the MessageFormatter, which is responsible for translating a byte stream between a formatted message and an in-memory Message object representation of the message.
How to Get Ready for WCF
Most developers are understandably ambivalent about a major upcoming release such as WCF. On the one hand, we welcome advancements in technology and the improvements in functionality and productivity that it will hopefully bring. On the other hand, we dread having to learn a new way of doing things, and we wonder whether we will be able to migrate our existing code to the new infrastructure. These are valid concerns, especially with WCF. But the issue is less about WCF changing things than it is about things needing to change. Developers today are faced with multiple and often competing technologies for building distributed applications, including the classic choice between XML Web services vs. .NET Remoting. Certainly, there are cases where there is no overlap and no ambivalence and where one technology is clearly the better choice than another. But these technologies share too much in common to be treated differently. They are simply variations of the same technology. In the case of XML Web services and .NET Remoting, they are both concerned with remote distributed object and service invocation over a defined transport channel. Microsoft is starting to address developer concerns by providing guidelines for how to get ready for WCF. It is already making sure to bring this topic up at professional conferences, and it will certainly continue to do so until the release of WCF. There has simply been too much investment in existing technologies for it not to. WCF is obviously not a replacement for the entire set of .NET Framework functionality. Instead, it is focused on supporting distributed service-oriented applications with security, transaction support, and reliable messaging. WCF primarily extends four core technologies that are available today:
CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
ASP .NET Web services (built with .asmx pages) Web Services Enhancements (WSE) System.Messaging System.EnterpriseServices Microsoft has stated that it will make the migration to WCF from current technologies a straightforward process. Here are some guidelines on how to get ready for WCF based on professional conferences, published white papers, and conversations with members of product development teams: Build services using .asmx pages. Use WSE 3.0 for additional, extended functionality, including security, policy, and secure conversation. Build qualified XML schema files for all custom data types used by the service. Use managed framework classes for integrating your services with MSMQ message queues and with COM+ components. Use the managed System.Messaging namespace for MSMQ, and the System.EnterpriseServices namespace for COM+ components. Avoid using the HTTP Context object in your .asmx pages. Avoid using .NET Remoting sinks and channels. Given that WSE 3.0 is such an important part of this book, let s look in more detail at how you can use the toolkit to prepare for WCF.
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