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Transaction processing is a way of orchestrating multiple related business operations so that they succeed or fail together, and thereby preserve the integrity of the overall workflow. Transaction management is an extremely difficult challenge in a service-oriented architecture. Web services are inherently disconnected, stateless components that do not by nature participate in broadly distributed transactions. The WS-Coordination, WS-Atomic Transaction, and WS-Business Activity specifications are designed to address the challenge of implementing transactions across distributed Web services.

CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)

The WS-Specifications will allow developers to build Web services that are interoperable, reliable, secure, and transacted. Ultimately, the overarching goal is for Web services technology to make it into the business mainstream, and to be considered as good a business solution as more established technologies. This book does not cover all of the available WS-Specifications for two reasons: First, it is impractical because some of the specifications are too new or too poorly established to be useful to most people. Second, it is problematic because WSE implements only a few of the available WS-Specifications, albeit many of the most important ones. With these points in mind, here is a list of the WS-Specifications I will be covering in this book: WS-Security WS-Policy WS-Policy Assertions WS-Policy Attachments WS-Security Policy

There are many advantages to policy assertions, not the least of which is that you could implement code in your consumer so that it will only work with a service that enforces a minimum policy guarantee Should this policy ever change, then your consumer is designed not to use the service any longer In a very sophisticated application, you could design your consumer to autodiscover an alternate service using the UDDI registry Services allow for things to go wrong: When you call a method on a traditional type-based component, you are making a leap of faith that the call will execute successfully The reality is that the vast majority of calls do go through, creating a sense of complacency that this is always the case.

Figure 7-11. ASP .NET AJAX Calendar control (Year view)

WS-Trust WS-Secure Conversation WS-Addressing WS-Reliable Messaging Perhaps the most glaring omission from the current WSE 2.0 is the absence of the transaction-related family of specifications, including WS-Coordination and WS-Atomic Transaction. But many other important specifications are present, most notably WS-Security, WS-Policy, and the WS-Addressing specifications. Omissions in WSE do not equate to insufficiency because it continues to evolve along with the WS-Specifications themselves. WSE 2.0 will always lag behind to some degree because it takes time to package the specifications into developerfriendly APIs. Microsoft is working on a related initiative called Indigo, which will provide integrated support for message-oriented technology directly in the operating system, including greatly expanded infrastructure support. Many of the tasks that we must write complex code for today will become simpler in Indigo. You can read more about Indigo in 10. The Appendix lists a number of useful references for learning more about the WS-Specifications. Surprisingly, the original WS-Specification documents are highly readable and very informative. They do not, of course, cover any vendorspecific developer toolkit, such as WSE. But they provide clear definitions and explanations of a specification, along with examples and references on how the specification is encoded within a SOAP message.

But in the service-oriented world, where the supporting infrastructure is vastly more intricate and decoupled, you cannot have such a high level of faith that calls will always go through Recall that XML messages are the gold currency of service requests Messages can experience trouble at many steps along the way Trouble in the transport channel can prevent them from being delivered Trouble in the service s server or firewall can prevent the service from ever responding to a received message Furthermore, messages may be tampered with, so that they are malformed or suspect when they do reach their intended target SOA accommodates all of these many potential problems using a set of technologies that maintain the integrity of a service request even if things go wrong along the way.

Lastly, if you wanted to have a little button next to the text box as the agent to open the calendar, all you have to do is set the PopupButtonID property of this control to the ID of the button.

TIP You can find links to the original WS-Specification documents at http://www-106.ibm.com/developerworks/views/webservices/standards.jsp.

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