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annotate src/org/eclipse/jetty/util/thread/Timeout.java @ 941:c948f674a2d5
simplify Timeout
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Tue, 11 Oct 2016 00:34:19 -0600 |
| parents | 8e9db0bbf4f9 |
| children | c157a786ed0b |
| rev | line source |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.util.thread; |
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20 |
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21 import org.slf4j.Logger; |
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22 import org.slf4j.LoggerFactory; |
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23 |
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24 |
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25 /* ------------------------------------------------------------ */ |
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26 /** Timeout queue. |
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27 * This class implements a timeout queue for timers that are at least as likely to be cancelled as they are to expire. |
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28 * Unlike the util timeout class, the duration of the timeouts is shared by all scheduled tasks and if the duration |
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29 * is changed, this affects all scheduled tasks. |
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30 * <p> |
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31 * The nested class Task should be extended by users of this class to obtain call back notification of |
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32 * expires. |
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33 */ |
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34 public class Timeout |
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35 { |
| 941 | 36 private static final Logger LOG = LoggerFactory.getLogger(Timeout.class); |
| 37 private Object _lock; | |
| 38 private long _duration; | |
| 39 private volatile long _now=System.currentTimeMillis(); | |
| 40 private Task _head=new Task(); | |
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41 |
| 941 | 42 /* ------------------------------------------------------------ */ |
| 43 public Timeout(Object lock) | |
| 44 { | |
| 45 _lock=lock; | |
| 46 _head._timeout=this; | |
| 47 } | |
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48 |
| 941 | 49 /* ------------------------------------------------------------ */ |
| 50 /** | |
| 51 * @return Returns the duration. | |
| 52 */ | |
| 53 public long getDuration() | |
| 54 { | |
| 55 return _duration; | |
| 56 } | |
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57 |
| 941 | 58 /* ------------------------------------------------------------ */ |
| 59 /** | |
| 60 * @param duration The duration to set. | |
| 61 */ | |
| 62 public void setDuration(long duration) | |
| 63 { | |
| 64 _duration = duration; | |
| 65 } | |
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66 |
| 941 | 67 /* ------------------------------------------------------------ */ |
| 68 public long setNow() | |
| 69 { | |
| 70 return _now=System.currentTimeMillis(); | |
| 71 } | |
| 72 | |
| 73 /* ------------------------------------------------------------ */ | |
| 74 public long getNow() | |
| 75 { | |
| 76 return _now; | |
| 77 } | |
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78 |
| 941 | 79 /* ------------------------------------------------------------ */ |
| 80 public void setNow(long now) | |
| 81 { | |
| 82 _now=now; | |
| 83 } | |
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84 |
| 941 | 85 /* ------------------------------------------------------------ */ |
| 86 /** Get an expired tasks. | |
| 87 * This is called instead of {@link #tick()} to obtain the next | |
| 88 * expired Task, but without calling it's {@link Task#expire()} or | |
| 89 * {@link Task#expired()} methods. | |
| 90 * | |
| 91 * @return the next expired task or null. | |
| 92 */ | |
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93 |
| 941 | 94 public Task expired() |
| 95 { | |
| 96 synchronized (_lock) | |
| 97 { | |
| 98 long _expiry = _now-_duration; | |
| 99 if (_head._next!=_head) | |
| 100 { | |
| 101 Task task = _head._next; | |
| 102 if (task._timestamp>_expiry) | |
| 103 return null; | |
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104 |
| 941 | 105 task.unlink(); |
| 106 task._expired=true; | |
| 107 return task; | |
| 108 } | |
| 109 return null; | |
| 110 } | |
| 111 } | |
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112 |
| 941 | 113 public void cancelAll() |
| 114 { | |
| 115 synchronized (_lock) | |
| 116 { | |
| 117 _head._next=_head._prev=_head; | |
| 118 } | |
| 119 } | |
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120 |
| 941 | 121 public long getTimeToNext() |
| 122 { | |
| 123 synchronized (_lock) | |
| 124 { | |
| 125 if (_head._next==_head) | |
| 126 return -1; | |
| 127 long to_next = _duration+_head._next._timestamp-_now; | |
| 128 return to_next<0?0:to_next; | |
| 129 } | |
| 130 } | |
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131 |
| 941 | 132 @Override |
| 133 public String toString() | |
| 134 { | |
| 135 StringBuffer buf = new StringBuffer(); | |
| 136 buf.append(super.toString()); | |
| 137 | |
| 138 Task task = _head._next; | |
| 139 while (task!=_head) | |
| 140 { | |
| 141 buf.append("-->"); | |
| 142 buf.append(task); | |
| 143 task=task._next; | |
| 144 } | |
| 145 | |
| 146 return buf.toString(); | |
| 147 } | |
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148 |
| 941 | 149 /* ------------------------------------------------------------ */ |
| 150 /* ------------------------------------------------------------ */ | |
| 151 /* ------------------------------------------------------------ */ | |
| 152 /* ------------------------------------------------------------ */ | |
| 153 /** Task. | |
| 154 * The base class for scheduled timeouts. This class should be | |
| 155 * extended to implement the expire() method, which is called if the | |
| 156 * timeout expires. | |
| 157 * | |
| 158 * | |
| 159 * | |
| 160 */ | |
| 161 public static class Task | |
| 162 { | |
| 163 Task _next; | |
| 164 Task _prev; | |
| 165 Timeout _timeout; | |
| 166 long _timestamp=0; | |
| 167 boolean _expired=false; | |
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168 |
| 941 | 169 protected Task() |
| 170 { | |
| 171 _next=_prev=this; | |
| 172 } | |
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173 |
| 941 | 174 private void unlink() |
| 175 { | |
| 176 _next._prev=_prev; | |
| 177 _prev._next=_next; | |
| 178 _next=_prev=this; | |
| 179 _expired=false; | |
| 180 } | |
| 181 } | |
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182 |
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183 } |