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public delegate void InputEventHandler(object sender, EventArgs e, string s); // Adapter public class MyCoolBook : MyOpenBook { static SortedList<string, MyCoolBook> community = new SortedList<string, MyCoolBook>(100); Interact visuals; public MyCoolBook(string name) : base(name) { // Create interact on the relevant thread, and start it! new Thread(delegate( ) { visuals = new Interact("CoolBook Beta"); visuals.InputEvent += new InputEventHandler(OnInput); visuals.FormClosed += new FormClosedEventHandler(OnFormClosed); Application.Run(visuals); }).Start( ); community[name] = this;

ContentManager contentMgr = (ContentManager) session.getAttribute("ContentManager");

Your portlet s JavaServer Pages can use HTML forms just like stand-alone JSP pages. The two most important portlet practices are to use the POST method for all forms, and to set the action for the form to an action URL or a render URL for the portlet. The POST method is necessary because the URL s query string may be used by the portlet container or portal to maintain information about the user s session. The POST method is safe for portlets (and any servlets or JSP pages they include) to use. The HTML form will need to point back to the portlet that created the form so the portlet can process the request. The portlet can create PortletURL objects that can then create portlet URLs. There are two choices for creating a portlet URL: action URLs or render URLs. Inside the JSP page, you will need to use one of the portlet URL JSP tags to create a portlet URL. Either portlet URL JSP tag will output a URL, so you can just include a tag into your form s action. We discuss the portlet JSP tags in the next section. For more on portlet URLs, see 2.

The principle behind the forward-caching Ajax client is very straightforward. You keep track of the ID of the current image and provide buttons that allow you to add and remove 1 from this ID. You then construct a URL to the image server, passing it the new ID and getting the response. Then you download the images that are 1 and 2 more than this value, as well as those that are 1 and 2 less than this value. When you call the URL and download the images, the browser will cache them. For example, if the current image is 100, and you move forward to 101, the page will construct a URL call to the server asking for 101. If this has already been called, the results will be cached, and the image loaded from the cache. It will also construct calls to 102, 103, 100, and 99, and put the responses in the browser cache. To do this, you need to use a slightly different technique from what you did in the simple example. You ll use two XMLHttpRequest objects: one with a callback that renders the image, and one that doesn t use a callback, but just gets the image and caches it. Add a new HTML page to your application and call it AJAXPictureClient.htm. Change the body of the application to contain a <div> in which the image will be displayed, and two buttons one for moving forward and one for moving backward. Here s the complete markup, including the JavaScript event-handler function calls that handle loading the page and clicking the buttons:

while (visuals == null) { Application.DoEvents( ); Thread.Sleep(100); } Add("Welcome to CoolBook " + Name); } private void OnFormClosed(object sender, FormClosedEventArgs e) { community.Remove(Name); } private void OnInput(object sender, EventArgs e, string s) { Add("\r\n"); Add(s, "Poked you"); } public new void Poke(string who) { Add("\r\n"); if (community.ContainsKey(who)) community[who].Add(Name, "Poked you"); else Add("Friend " + who + " is not part of the community"); } public new void Add(string message) { visuals.Output(message); } public new void Add(string friend, string message) { if (community.ContainsKey(friend)) community[friend].Add(Name + " : " + message); else Add("Friend " + friend + " is not part of the community"); } } // New implementation (Adaptee) public class Interact : Form { public TextBox Wall { get; set; } public Button Poke { get; set; } public Interact( ) { } public Interact(string title) { Control.CheckForIllegalCrossThreadCalls = true; Poke = new Button( ); Poke.Text = "Poke"; this.Controls.Add(Poke); Poke.Click += new EventHandler(Input); Wall = new TextBox( ); Wall.Multiline = true; Wall.Location = new Point(0, 30); Wall.Width = 300;