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Figure 9-14. Asynchronous web method calls In a traditional approach, you might have created threads manually and then executed each individual web method call on a separate thread. Fortunately, the web service proxy automatically provides the entire infrastructure needed to call web methods asynchronously. The proxy automatically creates methods of the form XXXXAsync(), where XXXX is the name of your web method. For example, if your web method name is HelloWorld(), there will be a method called HelloWorldAsync(). Calling this method invokes the web method in asynchronous fashion. After the web method has completed its processing, the proxy raises an event of the form XXXXComplete, where XXXX is the name of your web method. Taking the preceding example further, you will have the HelloWorldComplete event for your proxy. The automatically generated events are based on an automatically generated delegate. The delegate will be of the form XXXXEventHandler, where XXXX is the name of the event. You can use this event to trap the return value of the web method. To see how a web method can be called asynchronously, we will modify the example shown previously in Figure 9-12. The modified code is shown in Listing 9-19.

NOTE Actually the authors are quite perplexed by just how difficult rendering a portlet URL has been made sufficiently so that we suspect this is largely an oversight by the developers of the standard.

So, if you think about the simple case where the user is filling out a form on the browser (like our stock quote application in 2), what is happening is that the user sets the state of some of the controls in the form and invokes an HTML form data submission process, which sends the data to the server The server executes the application and then returns the results to the client This process is called a postback Newer application programming interfaces (APIs) and methodologies such as Ajax move some of the processing to the client, providing a richer client experience (they make more frequent asynchronous postbacks to the server to make the application appear more responsive), but your web applications still have a server element to them, and understanding how to handle this is vital as you write your web applications.

Listing 9-19. Calling a Web Method Asynchronously private void Form1_Load(object sender, EventArgs e) { Service proxy = new Service(); proxy.GetEmployeesCompleted += new GetEmployeesCompletedEventHandler(proxy_GetEmployeesCompleted); proxy.GetEmployeesAsync(); } void proxy_GetEmployeesCompleted(object sender, GetEmployeesCompletedEventArgs e) { DataSet ds = e.Result; dataGridView1.DataSource = ds.Tables["myemployees"].DefaultView; } The code creates an instance of the web service proxy class in the Load event handler of the form. Notice how the proxy automatically contains the GetEmployeesCompleted event and the GetEmployeesCompletedEventHandler delegate. The code then wires this event to its event handler function, proxy_GetEmployeesCompleted(). Finally, the GetEmployeesAsync() method of the proxy is called to start executing the web method in asynchronous fashion. After the execution is done, the proxy will raise the GetEmployeesCompleted event handler, which receives a parameter of type GetEmployeesCompletedEventArgs. This event argument parameter has a property called Result that gives you the actual return value of the web method. In our case, the return value is a DataSet and hence the code collects it in a DataSet variable. The DataGridView control is then bound with this returned DataSet.

The YAZD application has a GUI primarily built from JSP pages, so our solution to this problem has been to create a tag library specifically for rendering links so that the directed page will appear within the portlet. To recap, one of your tasks when converting an existing application into a portlet will be to determine which links need to leave the user in the portlet rather than directing to an external page, and then rewriting those links appropriately.