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SERVICE-ORIENTED ARCHITECTURE (SOA) represents a new and evolving model for building distributed applications. Services are distributed components, which provide well-defined interfaces that process and deliver XML messages. A servicebased approach makes sense for building solutions that cross organizational, departmental, and corporate domain boundaries. A business with multiple systems and applications on different platforms can use SOA to build a loosely coupled integration solution that implements unified workflows. The concept of services is familiar to anyone who shops online at an eCommerce web site. Once you have placed your order, you have to supply your credit card information, which is typically authorized and charged by an outside service vendor. Once the order has been committed, the eCommerce company then coordinates with a shipping service vendor directly to deliver your purchase. ECommerce applications provide another perfect illustration of the need for a service-oriented architecture: If the credit card billing component is offline or unresponsive, then you do not want the sales order collection process to fail. Instead, you want the order collected and the billing operation to proceed at a later time. Figure 1-1 provides a conceptual workflow for an eCommerce business that uses multiple services to process orders.

If you double-click the button in the designer, Visual Studio 2005 will add the onclick attribute to the <input type="button"> HTML element, set its value to return Button1_onclick(), and implement the stub of the function Button1_onclick inside a <script> element within the HTML head element. You can then put the following script into this function:

1

Note The sample project SOAPSender.csproj (contained within the solution SOAPRouter.sln) allows you

var testCar = new AJAXBook.Car('Honda','Pilot','2005'); alert(testCar.get_MakeandModel()); alert(testCar.get_Year()); return false;

Figure 1-1 Service-based workflow for an eCommerce business SOA is like other distributed architectures in that it enables you to build applications that use components across separate domain boundaries SOA uses Web services as application entry points, which are conceptually equivalent to the proxy and stub components of traditional component-based distributed systems, except that the interactions between the Web service provider and consumer are more loosely coupled SOA is also unique in that it incorporates those factors that are critically important to business: service reliability, message integrity, transactional integrity, and message security In the real world, business cannot rely on services that may process requests if they receive a request that they can understand Businesses require more certainty than this It is a given that disparate systems may be up or down at various times, or that different systems may differ in their responsiveness due to varying loads.

to toggle between a direct Web service call and an indirect one via a SOAP router (see StockTraderProxy.cs, Line 38). If you modify the URL for the Web service request, you must also modify the SoapActor attribute on the target Web service method to reflect the same target URL (see StockTrader.asmx, Line 33, in the SOAPService project). If you do not, you will receive addressing errors because the <to> header on the request must match the Actor attribute on the receiver. The sample projects contain clear notes describing how to toggle the SoapActor attribute in response to a different target URL from the sender.

The last step is to tell the ScriptManager to download your custom JavaScript file by adding the following HTML inside the <ScriptManager> element:

However, none of this is an excuse for allowing service request messages to simply drop away into the void, or to go unanswered Furthermore, there can be no ambiguity as to how a service must be called If a system publishes its capabilities as a Web-enabled service, then it needs to clearly document how the service must be called SOA will address many of the availability and scalability issues in today s applications Most applications implement a rigid synchronous communication model with a linear workflow model that is highly susceptible to failures at any point in the workflow SOA assumes that errors can and will occur, and so it implements strategies for handling them For example, if a service fails to accept a message request the first time, the architecture is designed to retry the delivery.

And if the service is entirely unavailable (which should never occur in a robust SOA), then the architecture is designed to avoid possible catastrophic failures that may disrupt the entire service request SOA improves reliability because temporary failure in one part of the workflow will not bring down the entire business process..

You can see the HTML of the complete web page in Figure 3-9.

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