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Typical web applications are stateless: To maintain a clean relationship between the client and the server, particularly to avoid confusion when in a clustered environment, no state of the condition of a client is stored on the server in a typical web application This can be overridden to some degree, but the typical scenario has the server destroy all instances of web page objects residing in its memory for a particular page once the page has been sent to the client This is great for scalability, but it can hurt the user and developer experience for example, when information should be persisted throughout a number of sessions and a mechanism has to be grown to achieve this ASP NET assists you in building applications that maintain state through a process called view state, in which information about the form can be stored in hidden HTML form fields.

Our application is to operate as a single portlet, but we want to base it on an application that was designed as a number of JSPs (effectively servlets). We could reconcile the two by discarding the JSPs and rewriting the portlet based on the business logic components, but this is a waste of perfectly good code. Instead, we build a controller portlet that hides the implementation detail of the JSP files and presents a single portlet for the portal to interact with.

In the previous section, you learned that SOAP is a lightweight XML-based protocol that forms one of the building blocks of the web service infrastructure. You also learned how web service requests and responses are encoded in SOAP format. Now it s time to peek inside SOAP in a bit of detail. Have a look at Listing 9-20. Listing 9-20. SOAP Request POST /WebServiceDemos/Service.asmx HTTP/1.1 Host: localhost Content-Type: text/xml; charset=utf-8 Content-Length: length SOAPAction: "http://tempuri.org/HelloWorld"

Our controller portlet must be capable of receiving a render request, determining from the parameters passed in which JSP page to dispatch the request to, and responding to any other requests made by the portal during the portlet s life cycle. As it turns out, this is surprisingly simple:

You ll be looking at view state a little later in this.

package com.portalbook.forums; import java.io.IOException; import javax.portlet.GenericPortlet;

< xml version="1.0" encoding="utf-8" > <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <HelloWorld xmlns="http://tempuri.org/" /> </soap:Body> </soap:Envelope> As you might have guessed, Listing 9-20 represents a SOAP request. If you observe this markup carefully, you will find that the request consists of an envelope (<soap:Envelope>) and body (<soap:Body>). In fact, a SOAP request or response can contain four possible parts. Each of these parts is described in Table 9-2. Table 9-2. Parts of a SOAP Message

chapter. Additionally, ASP .NET offers a session state mechanism that allows sessions to be persisted in a SQL server, allowing them to work in a clustered environment. This allows you to build a stateful web application, but the typical web application does not do this and is stateless.

import javax.portlet.PortletConfig; import javax.portlet.PortletContext; import javax.portlet.PortletException; import javax.portlet.RenderRequest; import javax.portlet.RenderResponse; import javax.portlet.WindowState; import com.Yasna.forum.Authorization; import com.Yasna.forum.AuthorizationFactory; import com.Yasna.forum.ForumFactory; import com.portalbook.forums.tags.UrlTag; public class ForumPortlet extends GenericPortlet { /** * Calls the request dispatcher to include a specified JSP path * in the portlet output. * * @param path The path to the JSP to include * @param request The request object to pass in * @param response The response object to pass in * @throws PortletException Thrown if there is a * * */ private void include(String path, RenderRequest request, RenderResponse response) throws PortletException, IOException { getPortletContext().getRequestDispatcher(path).include(request, response); } problem accessing the context problem writing the page fragment * @throws IOException Thrown if there is a

The SOAP envelope wraps the SOAP request or response. It is the root element of the SOAP message and is represented by the <soap:Envelope> markup tag. All SOAP messages must have an envelope. SOAP headers are an optional part of a SOAP message. They are used to pass arbitrary data to and from the web service and its client. For example, you can use them to pass authentication information to the web service. A SOAP header is represented by the <soap:Header> markup tag. The SOAP body is a mandatory part of a SOAP message. It includes the actual request or response data in XML format. The SOAP body is represented by the <soap:Body> markup tag. A SOAP fault is an optional part of a SOAP message. It comes into the picture whenever there is a run time exception in the web service. The exception details are enclosed in the <soap:Fault> tag and sent back to the client application.