Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/QueuedExecutor.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 File: QueuedExecutor.java
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3
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4 Originally written by Doug Lea and released into the public domain.
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5 This may be used for any purposes whatsoever without acknowledgment.
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6 Thanks for the assistance and support of Sun Microsystems Labs,
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7 and everyone contributing, testing, and using this code.
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8
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9 History:
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10 Date Who What
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11 21Jun1998 dl Create public version
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12 28aug1998 dl rely on ThreadFactoryUser, restart now public
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13 4may1999 dl removed redundant interrupt detect
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14 7sep2000 dl new shutdown methods
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15 */
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16
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17 package EDU.oswego.cs.dl.util.concurrent;
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18
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19 /**
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20 *
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21 * An implementation of Executor that queues incoming
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22 * requests until they can be processed by a single background
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23 * thread.
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24 * <p>
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25 * The thread is not actually started until the first
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26 * <code>execute</code> request is encountered. Also, if the
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27 * thread is stopped for any reason (for example, after hitting
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28 * an unrecoverable exception in an executing task), one is started
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29 * upon encountering a new request, or if <code>restart()</code> is
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30 * invoked.
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31 * <p>
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32 * Beware that, especially in situations
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33 * where command objects themselves invoke execute, queuing can
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34 * sometimes lead to lockups, since commands that might allow
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35 * other threads to terminate do not run at all when they are in the queue.
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36 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
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37 **/
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38 public class QueuedExecutor extends ThreadFactoryUser implements Executor {
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39
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40
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41
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42 /** The thread used to process commands **/
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43 protected Thread thread_;
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44
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45 /** Special queue element to signal termination **/
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46 protected static Runnable ENDTASK = new Runnable() { public void run() {} };
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47
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48 /** true if thread should shut down after processing current task **/
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49 protected volatile boolean shutdown_; // latches true;
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50
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51 /**
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52 * Return the thread being used to process commands, or
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53 * null if there is no such thread. You can use this
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54 * to invoke any special methods on the thread, for
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55 * example, to interrupt it.
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56 **/
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57 public synchronized Thread getThread() {
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58 return thread_;
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59 }
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60
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61 /** set thread_ to null to indicate termination **/
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62 protected synchronized void clearThread() {
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63 thread_ = null;
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64 }
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65
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66
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67 /** The queue **/
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68 protected final Channel queue_;
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69
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70
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71 /**
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72 * The runloop is isolated in its own Runnable class
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73 * just so that the main
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74 * class need not implement Runnable, which would
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75 * allow others to directly invoke run, which would
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76 * never make sense here.
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77 **/
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78 protected class RunLoop implements Runnable {
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79 public void run() {
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80 try {
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81 while (!shutdown_) {
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82 Runnable task = (Runnable)(queue_.take());
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83 if (task == ENDTASK) {
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84 shutdown_ = true;
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85 break;
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86 }
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87 else if (task != null) {
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88 task.run();
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89 task = null;
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90 }
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91 else
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92 break;
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93 }
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94 }
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95 catch (InterruptedException ex) {} // fallthrough
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96 finally {
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97 clearThread();
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98 }
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99 }
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100 }
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101
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102 protected final RunLoop runLoop_;
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103
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104
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105 /**
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106 * Construct a new QueuedExecutor that uses
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107 * the supplied Channel as its queue.
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108 * <p>
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109 * This class does not support any methods that
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110 * reveal this queue. If you need to access it
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111 * independently (for example to invoke any
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112 * special status monitoring operations), you
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113 * should record a reference to it separately.
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114 **/
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115
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116 public QueuedExecutor(Channel queue) {
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117 queue_ = queue;
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118 runLoop_ = new RunLoop();
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119 }
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120
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121 /**
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122 * Construct a new QueuedExecutor that uses
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123 * a BoundedLinkedQueue with the current
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124 * DefaultChannelCapacity as its queue.
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125 **/
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126
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127 public QueuedExecutor() {
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128 this(new BoundedLinkedQueue());
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129 }
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130
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131 /**
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132 * Start (or restart) the background thread to process commands. It has
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133 * no effect if a thread is already running. This
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134 * method can be invoked if the background thread crashed
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135 * due to an unrecoverable exception.
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136 **/
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137
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138 public synchronized void restart() {
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139 if (thread_ == null && !shutdown_) {
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140 thread_ = threadFactory_.newThread(runLoop_);
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141 thread_.start();
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142 }
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143 }
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144
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145
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146 /**
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147 * Arrange for execution of the command in the
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148 * background thread by adding it to the queue.
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149 * The method may block if the channel's put
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150 * operation blocks.
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151 * <p>
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152 * If the background thread
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153 * does not exist, it is created and started.
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154 **/
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155 public void execute(Runnable command) throws InterruptedException {
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156 restart();
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157 queue_.put(command);
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158 }
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159
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Dan Creswell <dan.creswell@gmail.com>
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160 /**
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161 * Terminate background thread after it processes all
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162 * elements currently in queue. Any tasks entered after this point will
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163 * not be processed. A shut down thread cannot be restarted.
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164 * This method may block if the task queue is finite and full.
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165 * Also, this method
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166 * does not in general apply (and may lead to comparator-based
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167 * exceptions) if the task queue is a priority queue.
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168 **/
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169 public synchronized void shutdownAfterProcessingCurrentlyQueuedTasks() {
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170 if (thread_ != null && !shutdown_) {
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171 try { queue_.put(ENDTASK); }
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172 catch (InterruptedException ex) {
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173 Thread.currentThread().interrupt();
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174 }
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175 }
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176 }
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177
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178
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179 /**
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180 * Terminate background thread after it processes the
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181 * current task, removing other queued tasks and leaving them unprocessed.
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182 * A shut down thread cannot be restarted.
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183 **/
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184 public synchronized void shutdownAfterProcessingCurrentTask() {
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185 shutdown_ = true;
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186 if (thread_ != null) {
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187 try {
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188 while (queue_.poll(0) != null) ; // drain
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189 queue_.put(ENDTASK);
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190 }
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191 catch (InterruptedException ex) {
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192 Thread.currentThread().interrupt();
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193 }
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194 }
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195 }
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196
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197
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198 /**
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199 * Terminate background thread even if it is currently processing
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200 * a task. This method uses Thread.interrupt, so relies on tasks
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201 * themselves responding appropriately to interruption. If the
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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202 * current tasks does not terminate on interruption, then the
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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203 * thread will not terminate until processing current task.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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204 * A shut down thread cannot be restarted.
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205 **/
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Dan Creswell <dan.creswell@gmail.com>
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206 public synchronized void shutdownNow() {
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207 shutdown_ = true;
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208 if (thread_ != null) {
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209 thread_.interrupt();
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210 shutdownAfterProcessingCurrentTask();
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211 }
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212 }
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213
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214
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215
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216 }