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WSE 3.0 and WCF
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WSE 3.0 allows developers to become early adopters of the next generation of service-oriented application technology. Every hour that you spend working with WSE 3.0 is an hour that you have contributed toward WCF. Applications that are built using WSE should migrate smoothly to the WCF framework, with only minor modifications required. If you choose to implement WSE today, then you should expect to accommodate changes to WSE between now and the release of WCF. It is unclear how many revisions WSE is expected to undergo prior to the release of WCF, but it is likely that we will only see service packs released, and they are not expected to negatively impact compatibility between WSE 3.0 and WCF. If anything, they should only make the compatibility tighter. Table 9-3 compares the feature set of WSE 3.0 with WCF, based on current information provided by Microsoft.
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CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
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Table 9-3. Feature Comparison of WSE 3.0 and WCF
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IIS/ASP.NET (.asmx) SoapReceivers [WebService], [WebMethod], etc. (supports interfaces, generics, and the like) One-way Request-response Custom (using WSE API)
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IIS/ASP .NET (.svc) ServiceHost [ServiceContract], [OperationContract], etc. (supports interfaces, generics, and so on) One-way Request-response First/last-operation Duplex Custom System.Runtime.Serialization System.Xml.Serialization (you can choose) MTOM Binary HTTP TCP Named pipes MSMQ P2P Custom Security Reliable messaging Transactions Concurrency Instancing Throttling Thread-binding Exception handling and faults Impersonation Session management Transaction behaviors Custom (via behavior types)
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XML Serialization
System.Xml.Serialization
Encodings Custom Transports
XML 1.0 MTOM XML 1.0 MTOM HTTP TCP Custom
Protocols
Security
Behaviors (enabled via attributes or configuration)
Local DTC transactions HTTP buffering HTTP caching HTTP sessions Custom (via SoapExtensions, WSE filters)
The main feature that is lacking in WSE 3.0 (compared to WCF) is that it does not provide wide system-level or infrastructure-level support for the enterprise aspect of service-oriented applications. Specifically, it does not provide support for transactions or reliable messaging. Certainly, WSE 3.0 provides many of the required parts, but it does not provide the whole. For example, WSE 3.0 provides support for message addressing, and it also integrates with MSMQ via the System.Messaging namespace classes. So WSE 3.0 gives you the ability today to custom build a service-oriented application that implements reliable messaging (via MSMQ) and which can process message addressing information and provide message correlation. But this is not the same as a built-in support infrastructure that manages these tasks for you.
CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
These limitations are not a weakness of the WSE 3.0 technology. They simply underscore two things: 1. Infrastructure support for message-based, service-oriented architecture is most effectively handled at the operating system level. 2. WSE 3.0 allows early adopters to start designing and building their code for the future WCF infrastructure. More importantly, it gets developers thinking about application design in new ways. There is a large conceptual jump between traditional RPC-based applications and message-based, service-oriented applications. With this being said, let s review the major feature areas of WSE 3.0 (which you should by now feel very familiar with) and explain where they fit within the WCF framework: Security and policy specifications: The WS-Security and WS-Policy specifications are supported by the WCF connector. Messaging specifications: WCF provides Messaging services that subsume the functionality currently provided by MSMQ. In addition, it provides support for reliable messaging. WSE does not currently provide comprehensive support for the WS-Reliable Messaging specification, but it does provide some of the component parts that you can cobble together to approximate the specification. Specifically, WSE includes support for WS-Addressing, and it integrates with MSMQ via the managed System.Messaging namespace. Routing and referral specifications: WCF includes these within its Messaging services functionality. Alternate transport channels: WCF provides support for several transport channels, including HTTP TCP and IPC. WSE 3.0 currently provides support for the same three , , channels, so you can begin coding with them today. In closing, we hope that this book has ultimately convinced you of three important things: 1. Message orientation and service orientation are the way to go. 2. WCF provides a welcome level of support for this technology, which will increase developer productivity and minimize confusion by unifying today s disparate technologies. 3. WSE 3.0 is an excellent way for developers to become early adopters for WCF. Good luck with your future adventures in service-oriented architecture!
CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)
Summary
WCF provides infrastructure and programming support for service-oriented applications. It is focused on messages and provides support for creating messages, for delivering messages, and for processing messages. With WCF, there is less ambiguity in your services: the infrastructure forces you to be message-oriented and to work with well-qualified XML-based data types. WCF is built on five major areas: The WCF service model: Provides support for processing incoming service request messages The WCF connector: Provides support for communicating with services reliably and securely Hosting environments: Provides several different hosting options for services Messaging services: Provides reliable messaging support System services: Provides a wide range of support infrastructure, including for transactions and trusted communications WSE 3.0 allows early adopters to start building service-oriented applications today, using the next generation of service-oriented and message-oriented technologies. Working with WSE 3.0 provides you with excellent preparation for WCF. In addition, you should be familiar with Microsoft s guidelines for how to tailor today s development to be more compatible with WCF-based applications in the future.
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