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WCF and Interoperability
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When you build connectable applications, you ll often be faced with the need to make your application talk to others that aren t built on the same APIs or technology. Consider the plumbing necessary to get a .NET Remoting application to talk to PHP, for example! Standards-based interoperability is a core design tenet of WCF. Using WCF allows you to quickly build services that use the advanced Web Services protocols (WS-*) this way, developers of applications that use other platforms can use the frameworks that implement the same standards on their platforms to talk to yours. It also allows you to easily upgrade your existing services and applications to use these standards, so you have a smooth glide path to upgrade your existing assets to standards-based interoperability. Finally, as new standards emerge, updates to the framework will become available, allowing you to use the standards with the peace of mind that Microsoft is supporting you. Any strategy for interoperability has two facets. The first is cross-platform interoperability, which is defined as support for communication between WCF and services built on non-Microsoft platforms. The strategy for this is to support the Web Services specifications extensively. The second is integration, which is defined as how WCF services will communicate with existing applications built on the Microsoft stack, including, for example, ASMX or Enterprise Services. At the heart of cross-platform interoperability is the support for the suite of Web Services standards, typically called WS-*. Three of the most important of these are WS-Security, WS-ReliableMessaging, and WS-Transactions, which provide for the secure, reliable, transactable services that are at the heart of WCF. You can see how these work in the abstract architecture diagram in Figure 7-2.
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Figure 7-2. WS-* support
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WS-Security is a set of enhancements to SOAP that allow you to specify how a message can be secured when being passed to and from a service. It can ensure that the message isn t tampered with, and that sensitive information, such as a password, is encrypted. The message is protected through authentication, confidentiality, and assurance of integrity. The original specification for WS-Security was drawn up by OASIS (Organization for the Advancement of Structured Information Standards), and is available at www.oasis-open.org.
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WS-ReliableMessaging builds on WS-Reliability, which is a set of enhancements to SOAP designed to guarantee message reliability to and from a web service. It has guaranteed delivery and duplication elimination, as well as the facility to ensure that the ordering of messages is maintained. WS-ReliableMessaging expands on this to provide reliable message delivery between applications, and is not limited to SOAP and Web Services, making it ideal for integration with existing systems. WS-ReliableMessaging is an important next step in ensuring the reliability of message interchange between distributed applications in that it is designed to also maintain reliability characteristics in the presence of component, system, or network failures. It is transport-independent, allowing it to be implemented on network technologies and protocols other than SOAP, but a SOAP binding is also defined within its specification.
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The WS-Transactions specifications define the mechanism for how applications running across Web Services domains can interoperate in a transactable manner. It is also designed to provide a means of composing transactional quality-of-service attributes into Web Services applications. The transaction standards are built on a number of other standards, including WS-Coordination for an extensible coordination framework, and specific types for different types of transactions, such as short-term atomic ones (WSAtomicTransaction) and longer-running business transactions (WS-BusinessActivity). WCF aims to allow these diverse specifications to be programmable using a single attribute-driven API. Later in this chapter, you ll build some simple WCF applications that implement security, reliability, and transactability under the hood so you won t have to worry about the complexity of dealing with their messaging structure manually.
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