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AOP, similar to facade objects, must implement the javax.ejb.SessionBean interface; business objects, such as entity EJBs, must implement the javax.ejb.EntityBean interface. AOP can be used, like for the session facade, through a marker interface. package aop.j2ee.business; public interface EntityBeanProtocol {} This empty interface must be implemented by the business objects or any entity EJB that will have minimal impact on the code. An aspect (such as the one in Listing 11-3) transforms POJOs into EJBs and implements the needed methods. Listing 11-3. An Aspect to Transform POJO into an Entity EJB package aop.j2ee.business.aspect; import java.sql.*; import javax.ejb.*; import aop.j2ee.business.aspect.marker.EntityBeanProtocol; public abstract aspect POJOEntity extends EJBResolver { declare parents: EntityBeanProtocol extends javax.ejb.EntityBean; private EntityContext EntityBeanProtocol.context; // generic EJB home methods ================================ public String EntityBeanProtocol .ejbFindByPrimaryKey(String primaryKey) throws FinderException { boolean result; try { result = selectByPrimaryKey(primaryKey); } catch (Exception ex) { throw new EJBException("ejbFindByPrimaryKey: " + ex.getMessage()); } if (result) { return primaryKey; } else { throw new ObjectNotFoundException

The Microsoft AJAX Library contains three core JavaScript files that deliver clientside functionality for your web pages. These three JavaScript files are stored as resources in the System.Web.Extensions assembly. At runtime, the HTTP handler ScriptResourceHandler loads the files, caches them for future use, compresses them, and sends them to the web browser when they re requested. The files contain the following functionality: The primary file, named MicrosoftAjax.js, contains 90% of the Microsoft AJAX Library s functionality. It includes, among other things, the browser compatibility layer, the core JavaScript classes, and the Base Class Library. The second file, named MicrosoftAjaxTimer.js, contains classes needed to support the Timer server control. This control enables you to update either part of or an entire web page at regular intervals; for example, you might want to update the current value of stock prices every 30 seconds. You ll see how to use the Timer control in the next chapter. The third file, named MicrosoftAjaxWebForms.js, includes classes that support partial-page rendering, that is, the functionality that allows portions of a page to be updated asynchronously. Without that, the whole page is postbacked to the server.

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For comparison, we ll show you an example of how Ajax-like techniques are implemented using IFRAMEs. It s pretty straightforward, and we have used this approach in the past (before XMLHttpRequest came on the scene). This example won t actually call the server, but it gives you an idea of how to use IFRAMEs for remote scripting. This example involves two files: iframe.html (see Listing 2-2) and server.html (see Listing 2-3). The server.html mimics the response that would actually be returned from a server.

("Row for id " + primaryKey + " not found."); } } // generic EJB methods ===================================== public void EntityBeanProtocol.ejbRemove() { try { deleteRow(getEntityId()); } catch (Exception ex) { throw new EJBException("ejbRemove: " + ex.getMessage()); } } public void EntityBeanProtocol .setEntityContext(EntityContext context) { this.context = context; setExtraContext(); } public void EntityBeanProtocol.unsetEntityContext() {} public void EntityBeanProtocol.ejbLoad() { try { loadEntity(); } catch (Exception ex) { throw new EJBException("ejbLoad: " + ex.getMessage()); } } public void EntityBeanProtocol.ejbStore() { try { storeEntity(); } catch (Exception ex) { throw new EJBException("ejbStore: " + ex.getMessage()); } } public void EntityBeanProtocol.ejbActivate() { setEntityId((String)context.getPrimaryKey()); } public void EntityBeanProtocol.ejbPassivate() { setEntityId(null); } // persistence protocol

Now that you ve created your AJAX-enabled web site, you will create your own JavaScript file that defines a namespace, which contains the class definition for a car. As you will see in the next few sections, the AJAX Library brings object-oriented programming (OOP) to JavaScript by providing namespaces, inheritance, interfaces, and other features. If you are familiar with the OO paradigm, then the advantages are obvious. If not, you will start to see how namespaces and inheritance make code simpler to write, debug, and understand. To create the JavaScript file, right-click the project within Solution Explorer, and click on Add New Item (see Figure 3-3).

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Listing 2-2. The iframe.html File <html> <head> <title>Example of remote scripting in an IFRAME</title> </head> <script type="text/javascript"> function handleResponse() { alert('this function is called from server.html'); } </script> <body> <h1>Remote Scripting with an IFRAME</h1> <iframe id="beforexhr" name="beforexhr" style="width:0px; height:0px; border: 0px" src="blank.html"></iframe> <a href="server.html" target="beforexhr">call the server</a> </body> </html> Listing 2-3. The server.html File <html> <head> <title>the server</title> </head> <script type="text/javascript"> window.parent.handleResponse(); </script> <body> </body> </html> Figure 2-2 shows the original page. Running this code produces a result like the one shown in Figure 2-3.

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