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;
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 SuspendingClient}s.
30 * @author gregw
31 *
32 */
33 public class SuspendingBayeux 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 public ClientImpl newRemoteClient()
46 {
47 return new SuspendingClient(this);
48 }
49
50 /* ------------------------------------------------------------ */
51 /* (non-Javadoc)
52 * @see org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext)
53 */
54 protected void initialize(ServletContext context)
55 {
56 super.initialize(context);
57
58 _tick=new Timer("SuspendingBayeux-"+__id++, true);
59 _timeout=new Timeout(this);
60 _timeout.setDuration(getMaxInterval());
61
62 _tick.schedule(new TimerTask()
63 {
64 public void run()
65 {
66 _timeout.setNow();
67 _now=_timeout.getNow();
68 _timeout.tick();
69 }
70 },500L,500L);
71 }
72
73 /* ------------------------------------------------------------ */
74 long getNow()
75 {
76 return _now;
77 }
78
79 /* ------------------------------------------------------------ */
80 public void setMaxInterval(long ms)
81 {
82 _timeout.setDuration(ms);
83 super.setMaxInterval(ms);
84 }
85
86 /* ------------------------------------------------------------ */
87 /* (non-Javadoc)
88 * @see org.mortbay.cometd.AbstractBayeux#initialize(javax.servlet.ServletContext)
89 */
90 public void destroy()
91 {
92 _tick.cancel();
93 }
94
95 /* ------------------------------------------------------------ */
96 void startTimeout(Task timeout,long delay)
97 {
98 if (delay==0)
99 _timeout.schedule(timeout);
100 else
101 _timeout.schedule(timeout,delay);
102 }
103
104 /* ------------------------------------------------------------ */
105 public void cancelTimeout(Task timeout)
106 {
107 if (timeout!=null)
108 timeout.cancel();
109 }
110
111 }