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annotate src/org/eclipse/jetty/util/thread/Timeout.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 8e9db0bbf4f9
children c948f674a2d5
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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 {
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36 private static final Logger LOG = LoggerFactory.getLogger(Timeout.class);
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37 private Object _lock;
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38 private long _duration;
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39 private volatile long _now=System.currentTimeMillis();
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40 private Task _head=new Task();
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41
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42 /* ------------------------------------------------------------ */
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43 public Timeout()
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44 {
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45 _lock=new Object();
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46 _head._timeout=this;
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47 }
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48
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49 /* ------------------------------------------------------------ */
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50 public Timeout(Object lock)
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51 {
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52 _lock=lock;
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53 _head._timeout=this;
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54 }
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55
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56 /* ------------------------------------------------------------ */
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57 /**
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58 * @return Returns the duration.
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59 */
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60 public long getDuration()
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61 {
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62 return _duration;
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63 }
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64
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65 /* ------------------------------------------------------------ */
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66 /**
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67 * @param duration The duration to set.
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68 */
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69 public void setDuration(long duration)
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70 {
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71 _duration = duration;
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72 }
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73
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74 /* ------------------------------------------------------------ */
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75 public long setNow()
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76 {
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77 return _now=System.currentTimeMillis();
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78 }
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79
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80 /* ------------------------------------------------------------ */
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81 public long getNow()
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82 {
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83 return _now;
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84 }
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85
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86 /* ------------------------------------------------------------ */
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87 public void setNow(long now)
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88 {
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89 _now=now;
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 /** Get an expired tasks.
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94 * This is called instead of {@link #tick()} to obtain the next
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95 * expired Task, but without calling it's {@link Task#expire()} or
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96 * {@link Task#expired()} methods.
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97 *
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98 * @return the next expired task or null.
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99 */
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100 public Task expired()
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101 {
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102 synchronized (_lock)
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103 {
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104 long _expiry = _now-_duration;
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105
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106 if (_head._next!=_head)
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107 {
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108 Task task = _head._next;
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109 if (task._timestamp>_expiry)
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110 return null;
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111
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112 task.unlink();
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113 task._expired=true;
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114 return task;
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115 }
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116 return null;
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117 }
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118 }
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119
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120 /* ------------------------------------------------------------ */
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121 public void tick()
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122 {
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123 final long expiry = _now-_duration;
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124
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125 Task task=null;
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126 while (true)
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127 {
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128 try
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129 {
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130 synchronized (_lock)
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131 {
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132 task= _head._next;
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133 if (task==_head || task._timestamp>expiry)
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134 break;
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135 task.unlink();
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136 task._expired=true;
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137 task.expire();
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138 }
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139
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140 task.expired();
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141 }
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142 catch(Throwable th)
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143 {
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144 LOG.warn("EXCEPTION",th);
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145 }
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146 }
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147 }
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148
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149 /* ------------------------------------------------------------ */
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150 public void tick(long now)
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151 {
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152 _now=now;
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153 tick();
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154 }
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155
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156 /* ------------------------------------------------------------ */
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157 public void schedule(Task task)
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158 {
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159 schedule(task,0L);
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160 }
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161
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162 /* ------------------------------------------------------------ */
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163 /**
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164 * @param task
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165 * @param delay A delay in addition to the default duration of the timeout
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166 */
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167 public void schedule(Task task,long delay)
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168 {
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169 synchronized (_lock)
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170 {
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171 if (task._timestamp!=0)
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172 {
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173 task.unlink();
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174 task._timestamp=0;
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175 }
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176 task._timeout=this;
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177 task._expired=false;
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178 task._delay=delay;
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179 task._timestamp = _now+delay;
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180
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181 Task last=_head._prev;
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182 while (last!=_head)
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183 {
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184 if (last._timestamp <= task._timestamp)
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185 break;
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186 last=last._prev;
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187 }
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188 last.link(task);
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189 }
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190 }
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191
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192
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193 /* ------------------------------------------------------------ */
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194 public void cancelAll()
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195 {
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196 synchronized (_lock)
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197 {
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198 _head._next=_head._prev=_head;
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199 }
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200 }
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201
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202 /* ------------------------------------------------------------ */
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203 public boolean isEmpty()
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204 {
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205 synchronized (_lock)
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206 {
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207 return _head._next==_head;
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208 }
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209 }
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210
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211 /* ------------------------------------------------------------ */
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212 public long getTimeToNext()
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213 {
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214 synchronized (_lock)
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215 {
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216 if (_head._next==_head)
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217 return -1;
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218 long to_next = _duration+_head._next._timestamp-_now;
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219 return to_next<0?0:to_next;
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220 }
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221 }
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222
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223 /* ------------------------------------------------------------ */
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224 @Override
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225 public String toString()
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226 {
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227 StringBuffer buf = new StringBuffer();
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228 buf.append(super.toString());
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229
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230 Task task = _head._next;
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231 while (task!=_head)
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232 {
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233 buf.append("-->");
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234 buf.append(task);
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235 task=task._next;
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236 }
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237
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238 return buf.toString();
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239 }
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240
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241 /* ------------------------------------------------------------ */
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242 /* ------------------------------------------------------------ */
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243 /* ------------------------------------------------------------ */
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244 /* ------------------------------------------------------------ */
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245 /** Task.
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246 * The base class for scheduled timeouts. This class should be
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247 * extended to implement the expire() method, which is called if the
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248 * timeout expires.
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249 *
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250 *
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251 *
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252 */
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253 public static class Task
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254 {
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255 Task _next;
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256 Task _prev;
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257 Timeout _timeout;
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258 long _delay;
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259 long _timestamp=0;
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260 boolean _expired=false;
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261
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262 /* ------------------------------------------------------------ */
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263 protected Task()
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264 {
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265 _next=_prev=this;
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266 }
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267
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268 /* ------------------------------------------------------------ */
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269 public long getTimestamp()
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270 {
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271 return _timestamp;
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272 }
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273
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274 /* ------------------------------------------------------------ */
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275 public long getAge()
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276 {
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277 final Timeout t = _timeout;
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278 if (t!=null)
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279 {
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280 final long now=t._now;
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281 if (now!=0 && _timestamp!=0)
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282 return now-_timestamp;
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283 }
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284 return 0;
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285 }
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286
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287 /* ------------------------------------------------------------ */
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288 private void unlink()
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289 {
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290 _next._prev=_prev;
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291 _prev._next=_next;
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292 _next=_prev=this;
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293 _expired=false;
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294 }
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295
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296 /* ------------------------------------------------------------ */
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297 private void link(Task task)
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298 {
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299 Task next_next = _next;
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300 _next._prev=task;
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301 _next=task;
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302 _next._next=next_next;
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303 _next._prev=this;
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304 }
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305
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306 /* ------------------------------------------------------------ */
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307 /** Schedule the task on the given timeout.
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308 * The task exiry will be called after the timeout duration.
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309 * @param timer
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310 */
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311 public void schedule(Timeout timer)
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312 {
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313 timer.schedule(this);
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314 }
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315
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316 /* ------------------------------------------------------------ */
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317 /** Schedule the task on the given timeout.
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318 * The task exiry will be called after the timeout duration.
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319 * @param timer
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320 */
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321 public void schedule(Timeout timer, long delay)
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322 {
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323 timer.schedule(this,delay);
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324 }
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325
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326 /* ------------------------------------------------------------ */
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327 /** Reschedule the task on the current timeout.
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328 * The task timeout is rescheduled as if it had been cancelled and
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329 * scheduled on the current timeout.
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330 */
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331 public void reschedule()
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332 {
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333 Timeout timeout = _timeout;
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334 if (timeout!=null)
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335 timeout.schedule(this,_delay);
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336 }
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337
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338 /* ------------------------------------------------------------ */
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339 /** Cancel the task.
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340 * Remove the task from the timeout.
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341 */
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342 public void cancel()
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343 {
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344 Timeout timeout = _timeout;
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345 if (timeout!=null)
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346 {
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347 synchronized (timeout._lock)
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348 {
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349 unlink();
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350 _timestamp=0;
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351 }
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352 }
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353 }
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354
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355 /* ------------------------------------------------------------ */
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356 public boolean isExpired() { return _expired; }
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357
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358 /* ------------------------------------------------------------ */
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359 public boolean isScheduled() { return _next!=this; }
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360
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361 /* ------------------------------------------------------------ */
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362 /** Expire task.
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363 * This method is called when the timeout expires. It is called
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364 * in the scope of the synchronize block (on this) that sets
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365 * the {@link #isExpired()} state to true.
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366 * @see #expired() For an unsynchronized callback.
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367 */
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368 protected void expire(){}
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369
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370 /* ------------------------------------------------------------ */
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371 /** Expire task.
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372 * This method is called when the timeout expires. It is called
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373 * outside of any synchronization scope and may be delayed.
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374 *
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375 */
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376 public void expired(){}
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377
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378 }
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379
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380 }