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Whenever doView() is invoked, we render a simple set of tables demonstrating the current state of the crawler running in the background. Appropriate headers for the response are rendered, and then the output print writer is retrieved from the response object and all output is generated using this. Both of our examples have used inline HTML to render output to the portlet window. Although this is straightforward, you can see with this example that it rapidly makes the structure of the page difficult to follow. In 5, we discuss the option of delegating the rendering of the page to a servlet or JavaServer Pages (JSP) page instead. The full implementation of our threaded portlet follows. Because our crawler implementation is thread safe, we have only to ensure that we start the crawler thread in the init() method, and stop it in the destroy() method, and that we don t start any additional threads during the lifetime of our portlet. Here is the threaded crawler portlet in full:

package com.portalbook.crawler; import java.io.*; import java.net.*; import java.util.*; import javax.portlet.*; public class CrawlerPortlet extends GenericPortlet { public CrawlerPortlet() { super(); } public void init(PortletConfig config) throws PortletException { String path = (String)config.getInitParameter("crawlPath"); try { crawler = new Crawler(path); // Here we create and kick off the background

If you run the web form after writing the code, it should look similar to Figure A-3.

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xml:lang="en-US" x:Class="BlendProject1.Window1" x:Name="Window" Title="Window" Width="640" Height="480"> <Grid x:Name="LayoutRoot"/> </Window>

Thread background = new Thread(crawler); background.start(); } catch( MalformedURLException e ) { throw new PortletException( "Portlet could not be initialised",e); } } public void destroy() { // Here we ensure that the background // thread is terminated safely. crawler.stopCrawler(); crawler = null; } private void renderCollection( PrintWriter out, String title, Collection collection ) throws IOException { out.write("<table cellspacing=\"0\""); out.write("border=\"0\">"); out.write("<tr><td><b>"); out.write(title); out.write("</b></td></tr>"); Iterator i = collection.iterator(); while(i.hasNext()) { out.write("<tr><td>"); out.write(i.next().toString()); out.write("</td></tr>"); } out.write("</table><br>"); } protected void doView( RenderRequest request, RenderResponse response) throws { PortletException, IOException

Summary

The basic layout of the Blend IDE when you are editing a project is shown in Figure 8-7. At the very left is the toolbar. To the right of this are the interaction tools, where timelines, triggers, and animations are designed. In the center is the Designer/XAML Editor. F11 puts you into Visual Design mode, where you can drag and drop XAML controls onto the page, and use a code editor that allows you to tweak your current XAML code. The right side of the screen is the management area, where you control your project, your connections to outside data sources, and the properties of the components you are currently editing.

3

response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.write("<table><tr><td>"); out.write("<h2>Crawler</h2>"); out.write("<table cellspacing=\"0\""); out.write("border=\"1\">"); out.write("<tr><td align=\"right\">"); out.write("<i>Status</i></td><td><b>"); out.write( crawler.isStopped() "stopped" : "running"); out.write("</b></td></tr>"); out.write("</table>"); // Note that while we can access an object running // in a background thread from the doView method, // we must not create a new thread of execution here. renderCollection(out, "Hosts Crawled", crawler.getVisitedHosts()); renderCollection(out, "Links Visited", crawler.getVisitedURLs()); renderCollection(out, "Failed Links", crawler.getFailedURLs()); renderCollection(out, "Forbidden Links", crawler.getForbiddenURLs()); out.write("</td></tr></table>"); } protected String getTitle(RenderRequest request) { return "Link Crawler"; } private Crawler crawler; }

The left-hand side of the screen contains the control bar. When you hold the mouse down on any of the control icons (they have a triangle on their bottom-right-hand corner), the controls within that family will pop up. For example, if you hold the mouse on the Button icon, the list of selectable controls (such as CheckBox and RadioButton) will appear (see Figure 8-8).

In this appendix, you learned to create custom implementations of the XmlReader and XmlWriter classes. The XmlReader and XmlWriter classes are abstract classes. To create custom readers and writers, you need to inherit from them and override various properties and methods. This way, you can easily extend the out-of-the-box functionality exposed by these classes for a specific scenario.

Summary

You then simply select any control and drag the mouse onto the design surface to place and size it, or alternatively double-click it to get a default position and size on the design surface. As the current layout for the Window1.xaml is using the grid layout methodology, you can place the control anywhere you like. Once a control is on the design surface, you can edit its properties using the Property Editor on the right-hand side of the screen (see Figure 8-9).