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The call to the initialize() method, as the name suggests, initializes an instance of the Application class by raising the load event, which then resides on the browser for the remainder of the application life cycle. Therefore, the role and function of the Application class is analogous to the role of the Page class in a typical ASP.NET page. For ASP.NET AJAX pages, the Sys.Application class picks up where the Page class left off on the server side. However, among other things, one big difference is that the client-side events of a page as included in the Sys.Application class are a lot fewer than those offered in the server-side Page class. In fact, there are only three events: init, load, and unload. Internally, the Sys.Application classes map events of JavaScript s window object to these three events. Table 4-11 lists these three events of the Sys.Application class.

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Figure 1-4 illustrates an architecture in which two separate Web services access the same back-end business components. Each Web service provides a distinct service interface, each of which is suitable for a different type of client. For example, Web service 1 may provide access to a public, unsecured subset of functions, whereas Web service 2 provides access to a restricted, secured subset of functions. In addition, Figure 1-4 introduces two new entities that play an important role in complex SOA solutions: Service agent: The service agent manages communications between one service and another, or between a business object and an external service. In doing so, it simplifies those interactions by shielding translation quirks between the consumer and the provider. Business fa ade: The business fa ade acts as a trust boundary between incoming service requests (from a client, another service, or a service agent) and the middle-tier business components that service those requests. Let s consider each of these in turn.

Raised after scripts have been loaded and immediately before objects are created Raised after scripts have been loaded and objects in the page have been created and initialized Raised right before all objects in the page are disposed of

Generate the Client Proxy Class File (Step 5)

Business components are the engines of applications because they contain the logic to make the application work In addition, business components know where to find information, whether it comes from a back-end database or from an external data source In classic Windows-based n-tier architecture, we are used to thinking of business components as self-sufficient But sometimes business components need to retrieve information from external sources in order to do their work In SOA terms, sometimes business components need to call external services The service agent is responsible for managing communications between a business object and an external service Service agents are extremely important because they simplify the amount of work that a business object has to do when it needs to use an external service A service agent is a locally installed assembly that provides a well-known interface to the business object.

Much like server-side ASP.NET, where Page_Load is the default event handler for the server-side Load event, the Sys.Application class also provides default event handlers for the client-side load and unload events. Consider the following script block:

Service agents do the manual legwork of communicating with external services and implementing whatever infrastructure is required to do so This is useful for two important reasons: Business objects do not have to implement the infrastructure that is required to communicate with an external service Instead, they communicate their requests to a local assembly (the service agent) using a mutually understood interface Business objects avoid the maintenance work that is required to keep service interactions up to date For example, if an external Web service interface changes, the service agent takes care of updating its proxy class and reworking the code implementation as needed The business object can continue to communicate with the service agent in the same manner, even as the underlying communication details change I cannot resist using a travel analogy to describe the role that service agents play.

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