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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   * @author gregw
31   *
32   */
33  public class ContinuationBayeux extends AbstractBayeux
34  {
35      private static int __id;
36      private transient Timer _tick;
37      private transient Timeout _timeout;
38      private long _now;
39      
40      
41      /* ------------------------------------------------------------ */
42      /* (non-Javadoc)
43       * @see org.mortbay.cometd.AbstractBayeux#newClient(java.lang.String, dojox.io.cometd.Destination)
44       */
45      @Override
46      public ClientImpl newRemoteClient()
47      {
48          return new ContinuationClient(this);
49      }
50  
51  
52      /* ------------------------------------------------------------ */
53      /* (non-Javadoc)
54       * @see org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext)
55       */
56      @Override
57      protected void initialize(ServletContext context)
58      {
59          super.initialize(context);
60          
61          _tick=new Timer("ContinuationBayeux-"+__id++, true);
62          _timeout=new Timeout();
63          _timeout.setDuration(getMaxInterval());
64      
65          _tick.schedule(new TimerTask()
66          {
67              @Override
68              public void run()
69              {
70                  _now=System.currentTimeMillis();
71                  _timeout.tick(_now);
72              }
73          },500L,500L);
74      }
75  
76      /* ------------------------------------------------------------ */
77      long getNow()
78      {
79          return _now;
80      }
81      
82      /* ------------------------------------------------------------ */
83      @Override
84  	public void setMaxInterval(long ms)
85      {
86          _timeout.setDuration(ms);
87          super.setMaxInterval(ms);
88      }
89  
90      /* ------------------------------------------------------------ */
91      /* (non-Javadoc)
92       * @see org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext)
93       */
94      public void destroy()
95      {
96          _tick.cancel();
97      }
98  
99      /* ------------------------------------------------------------ */
100     void startTimeout(Task timeout,long delay)
101     {
102         synchronized(_timeout)
103         {
104             if (delay==0)
105                 _timeout.schedule(timeout);
106             else
107                 _timeout.schedule(timeout,delay);
108         }
109     }
110 
111     /* ------------------------------------------------------------ */
112     public void cancelTimeout(Task timeout)
113     {
114         synchronized(_timeout)
115         {
116             if (timeout!=null)
117                 timeout.cancel();
118         }
119     }
120     
121 }