JavascriptChat


1   package org.getahead.dwrdemo.chat;
2   
3   import java.util.Collection  ;
4   import java.util.Iterator  ;
5   import java.util.LinkedList  ;
6   
7   import org.directwebremoting.ScriptBuffer;
8   import org.directwebremoting.ScriptSession;
9   import org.directwebremoting.WebContext;
10  import org.directwebremoting.WebContextFactory;
11  import org.directwebremoting.util.Logger;
12  
13  /**
14   * @author Joe Walker [joe at getahead dot ltd dot uk]
15   */
16  public class JavascriptChat
17  {
18      /**
19       * @param text The new message text to add
20       */
21      public void addMessage(String   text)
22      {
23          if (text != null && text.trim().length() > 0)
24          {
25              messages.addFirst(new Message(text));
26              while (messages.size() > 10)
27              {
28                  messages.removeLast();
29              }
30          }
31  
32          WebContext wctx = WebContextFactory.get();
33          String   currentPage = wctx.getCurrentPage();
34  
35          ScriptBuffer script = new ScriptBuffer();
36          script.appendScript("receiveMessages(")
37                .appendData(messages)
38                .appendScript(");");
39  
40          // Loop over all the users on the current page
41          Collection   pages = wctx.getScriptSessionsByPage(currentPage);
42          for (Iterator   it = pages.iterator(); it.hasNext();)
43          {
44              ScriptSession otherSession = (ScriptSession) it.next();
45              otherSession.addScript(script);
46          }
47      }
48  
49      /**
50       * The current set of messages
51       */
52      private LinkedList   messages = new LinkedList  ();
53  
54      /**
55       * The log stream
56       */
57      protected static final Logger log = Logger.getLogger(JavascriptChat.class);
58  }
59
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