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CHAPTER 8 SOAP MESSAGES: ADDRESSING, MESSAGING, AND ROUTING
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At this point, you should be more comfortable with the concepts behind WS-Addressing, but you are probably still wondering exactly how to put these concepts, and the code, into action. Remember that WS-Addressing is a support specification that is built for messaging. The next section on messaging will provide you with the context for addressing by showing you the important role that addressing plays for messaging.
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Overview of Messaging
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WSE 3.0 includes support for messaging, which provides developers with a new range of features for transporting and processing SOAP messages. Traditional XML Web services support the HTTP transport protocol only, which limits the client and server to communicating with a synchronous request/response design pattern. WSE 3.0 messaging continues to support the HTTP protocol, but it also supports two additional transport protocols: TCP: This is a low-level protocol that communicates across processes and domain boundaries. TCP is the underlying protocol in most Internet communications. In-Process: This protocol is designed for communication between components within the same application domain. It is an optimized, low-level protocol that provides the flexibility of TCP but is optimized for communication within the same application domain. In addition, WSE 3.0 provides classes that allow you to custom implement additional transport protocols, such as SMTP and MSMQ.
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Comparing Messaging with the HTTP and TCP Protocols
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Services that communicate over HTTP must reside on a Web server in order for their endpoints to be accessible. However, services that communicate over TCP are accessible over a direct port without requiring a virtual directory. Here is an example of an HTTP endpoint: http://www.bluestonepartners.com/StockTrader.asmx And here is an example of the equivalent TCP endpoint: soap.tcp://216.70.214.118/StockTrader The HTTP and TCP protocols have one thing in common: they both enable messaging between remote components that are running on separate processes and on separate domains. TCP is a lower-level protocol that operates on a port rather than a virtual directory, which is a higher-level abstraction of a port. HTTP is designed for request/response messaging patterns, meaning that a request generates a direct response. TCP is designed for decoupled messaging patterns, whereby a sender and a receiver communicate but not necessarily as a two-way conversation. TCP enables
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CHAPTER 8 SOAP MESSAGES: ADDRESSING, MESSAGING, AND ROUTING
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asynchronous messaging, whereby the sender releases its calling thread as soon as the message has been delivered to the receiver. By extension, TCP also enables one-way messaging, because once a sender mails out a message its resources are released and the sender suffers no resource or scalability problems waiting for a response that will never come. This is the beauty of the decoupled TCP protocol: You can implement a request/response messaging pattern if you want to but, unlike HTTP you do not have to. ,
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Note Technically the HTTP protocol does support one-way messaging. The response will generate an
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HTTP 202 status code (meaning request accepted ), and no SOAP message will be returned.
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Representing SOAP Messages in the WSE 3.0 Messaging Framework
The Microsoft.Web.Services3 namespace provides a class called SoapEnvelope, which you use for generating SOAP messages in code. The SoapEnvelope class derives from the System.Xml.XmlDocument class, not surprisingly, and so it supports XML document loading so that you can load preformatted SOAP messages into a SoapEnvelope object. Alternatively, you can construct the SOAP message from scratch by setting properties on the SoapEnvelope object. Table 8-3 highlights important members of the SoapEnvelope class. Listing 8-4 shows you how to construct a SOAP message in code for requesting a stock quote from the RequestQuote operation. Table 8-3. The SoapEnvelope Class
Property
Envelope Body Header Fault
Type
XmlElement XmlElement XmlElement Exception
Description
The envelope is the root element of the message XML. It contains the message body and message header elements. The body element is required for all SOAP messages. It contains qualified XML for the request and response messages. The header contains optional extended information for the SOAP message. The WS- specification settings are stored in the header. The SOAP fault information, if present, is retrieved from the envelope and returned by the Fault property as an Exception class. The Context property enables you to modify the SOAP message contents within a custom WSE filter or to process the SOAP message contents within a SoapReceiver processing class.
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