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1   // ========================================================================
2   // Copyright 2006 Mort Bay Consulting Pty. Ltd.
3   // ------------------------------------------------------------------------
4   // Licensed under the Apache License, Version 2.0 (the "License");
5   // you may not use this file except in compliance with the License.
6   // You may obtain a copy of the License at 
7   // http://www.apache.org/licenses/LICENSE-2.0
8   // Unless required by applicable law or agreed to in writing, software
9   // distributed under the License is distributed on an "AS IS" BASIS,
10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11  // See the License for the specific language governing permissions and
12  // limitations under the License.
13  //========================================================================
14  
15  package org.mortbay.cometd.continuation;
16  
17  import java.util.Timer;
18  import java.util.TimerTask;
19  
20  import javax.servlet.ServletContext;
21  
22  import org.mortbay.cometd.AbstractBayeux;
23  import org.mortbay.cometd.ClientImpl;
24  import org.mortbay.thread.Timeout;
25  import org.mortbay.thread.Timeout.Task;
26  
27  /* ------------------------------------------------------------ */
28  /**
29   * Extension of Bayeux that uses {@link ContinuationClient}s.
30   * 
31   * @author gregw
32   * 
33   */
34  public class ContinuationBayeux extends AbstractBayeux
35  {
36      private static int __id;
37      private transient Timer _tick;
38      private transient Timeout _timeout;
39      private long _now;
40  
41      /* ------------------------------------------------------------ */
42      /*
43       * (non-Javadoc)
44       * 
45       * @see org.mortbay.cometd.AbstractBayeux#newClient(java.lang.String,
46       * dojox.io.cometd.Destination)
47       */
48      @Override
49      public ClientImpl newRemoteClient()
50      {
51          ClientImpl client=new ContinuationClient(this);
52          addClient(client,null);
53          return client;
54      }
55  
56      /* ------------------------------------------------------------ */
57      /*
58       * (non-Javadoc)
59       * 
60       * @see
61       * org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext
62       * )
63       */
64      @Override
65      protected void initialize(ServletContext context)
66      {
67          super.initialize(context);
68  
69          _tick=new Timer("ContinuationBayeux-" + __id++,true);
70          _timeout=new Timeout();
71  
72          _tick.schedule(new TimerTask()
73          {
74              @Override
75              public void run()
76              {
77                  _now=System.currentTimeMillis();
78                  _timeout.tick(_now);
79              }
80          },100L,100L);
81      }
82  
83      /* ------------------------------------------------------------ */
84      long getNow()
85      {
86          return _now;
87      }
88  
89      /* ------------------------------------------------------------ */
90      /*
91       * (non-Javadoc)
92       * 
93       * @see
94       * org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext
95       * )
96       */
97      public void destroy()
98      {
99          _tick.cancel();
100     }
101 
102     /* ------------------------------------------------------------ */
103     void startTimeout(Timeout.Task timeout, long interval)
104     {
105         synchronized(_timeout)
106         {
107             _timeout.schedule(timeout,interval);
108         }
109     }
110 
111     /* ------------------------------------------------------------ */
112     void cancelTimeout(Timeout.Task timeout)
113     {
114         synchronized(_timeout)
115         {
116             if (timeout != null)
117                 timeout.cancel();
118         }
119     }
120 
121 }