Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/ClockDaemon.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: ClockDaemon.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 29Aug1998 dl created initial public version
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12 17dec1998 dl null out thread after shutdown
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13 */
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14
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15 package EDU.oswego.cs.dl.util.concurrent;
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16 import java.util.Comparator;
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17 import java.util.Date;
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18
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19 /**
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20 * A general-purpose time-based daemon, vaguely similar in functionality
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21 * to common system-level utilities such as <code>at</code>
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22 * (and the associated crond) in Unix.
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23 * Objects of this class maintain a single thread and a task queue
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24 * that may be used to execute Runnable commands in any of three modes --
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25 * absolute (run at a given time), relative (run after a given delay),
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26 * and periodic (cyclically run with a given delay).
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27 * <p>
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28 * All commands are executed by the single background thread.
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29 * The thread is not actually started until the first
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30 * request is encountered. Also, if the
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31 * thread is stopped for any reason, one is started upon encountering
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32 * the next request, or <code>restart()</code> is invoked.
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33 * <p>
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34 * If you would instead like commands run in their own threads, you can
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35 * use as arguments Runnable commands that start their own threads
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36 * (or perhaps wrap within ThreadedExecutors).
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37 * <p>
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38 * You can also use multiple
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39 * daemon objects, each using a different background thread. However,
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40 * one of the reasons for using a time daemon is to pool together
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41 * processing of infrequent tasks using a single background thread.
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42 * <p>
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43 * Background threads are created using a ThreadFactory. The
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44 * default factory does <em>not</em>
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45 * automatically <code>setDaemon</code> status.
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46 * <p>
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47 * The class uses Java timed waits for scheduling. These can vary
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48 * in precision across platforms, and provide no real-time guarantees
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49 * about meeting deadlines.
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50 * <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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51 **/
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52
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53 public class ClockDaemon extends ThreadFactoryUser {
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54
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55
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56 /** tasks are maintained in a standard priority queue **/
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57 protected final Heap heap_ = new Heap(DefaultChannelCapacity.get());
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58
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59
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60 protected static class TaskNode implements Comparable {
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61 final Runnable command; // The command to run
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62 final long period; // The cycle period, or -1 if not periodic
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63 private long timeToRun_; // The time to run command
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64
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65 // Cancellation does not immediately remove node, it just
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66 // sets up lazy deletion bit, so is thrown away when next
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67 // encountered in run loop
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68
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69 private boolean cancelled_ = false;
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70
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71 // Access to cancellation status and and run time needs sync
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72 // since they can be written and read in different threads
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73
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74 synchronized void setCancelled() { cancelled_ = true; }
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75 synchronized boolean getCancelled() { return cancelled_; }
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76
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77 synchronized void setTimeToRun(long w) { timeToRun_ = w; }
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78 synchronized long getTimeToRun() { return timeToRun_; }
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79
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80
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81 public int compareTo(Object other) {
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82 long a = getTimeToRun();
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83 long b = ((TaskNode)(other)).getTimeToRun();
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84 return (a < b)? -1 : ((a == b)? 0 : 1);
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85 }
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86
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87 TaskNode(long w, Runnable c, long p) {
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88 timeToRun_ = w; command = c; period = p;
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89 }
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90
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91 TaskNode(long w, Runnable c) { this(w, c, -1); }
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92 }
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93
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94
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95 /**
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96 * Execute the given command at the given time.
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97 * @param date -- the absolute time to run the command, expressed
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98 * as a java.util.Date.
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99 * @param command -- the command to run at the given time.
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100 * @return taskID -- an opaque reference that can be used to cancel execution request
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101 **/
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102 public Object executeAt(Date date, Runnable command) {
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103 TaskNode task = new TaskNode(date.getTime(), command);
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104 heap_.insert(task);
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105 restart();
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106 return task;
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107 }
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108
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109 /**
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110 * Excecute the given command after waiting for the given delay.
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111 * <p>
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112 * <b>Sample Usage.</b>
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113 * You can use a ClockDaemon to arrange timeout callbacks to break out
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114 * of stuck IO. For example (code sketch):
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115 * <pre>
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116 * class X { ...
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117 *
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118 * ClockDaemon timer = ...
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119 * Thread readerThread;
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120 * FileInputStream datafile;
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121 *
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122 * void startReadThread() {
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123 * datafile = new FileInputStream("data", ...);
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124 *
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125 * readerThread = new Thread(new Runnable() {
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126 * public void run() {
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127 * for(;;) {
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128 * // try to gracefully exit before blocking
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129 * if (Thread.currentThread().isInterrupted()) {
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130 * quietlyWrapUpAndReturn();
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131 * }
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132 * else {
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133 * try {
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134 * int c = datafile.read();
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135 * if (c == -1) break;
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136 * else process(c);
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137 * }
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138 * catch (IOException ex) {
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139 * cleanup();
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140 * return;
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141 * }
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142 * }
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143 * } };
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144 *
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145 * readerThread.start();
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146 *
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147 * // establish callback to cancel after 60 seconds
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148 * timer.executeAfterDelay(60000, new Runnable() {
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149 * readerThread.interrupt(); // try to interrupt thread
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150 * datafile.close(); // force thread to lose its input file
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151 * });
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152 * }
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153 * }
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154 * </pre>
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155 * @param millisecondsToDelay -- the number of milliseconds
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156 * from now to run the command.
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157 * @param command -- the command to run after the delay.
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158 * @return taskID -- an opaque reference that can be used to cancel execution request
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159 **/
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160 public Object executeAfterDelay(long millisecondsToDelay, Runnable command) {
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161 long runtime = System.currentTimeMillis() + millisecondsToDelay;
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162 TaskNode task = new TaskNode(runtime, command);
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163 heap_.insert(task);
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164 restart();
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165 return task;
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166 }
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167
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168 /**
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169 * Execute the given command every <code>period</code> milliseconds.
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170 * If <code>startNow</code> is true, execution begins immediately,
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171 * otherwise, it begins after the first <code>period</code> delay.
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172 * <p>
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173 * <b>Sample Usage</b>. Here is one way
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174 * to update Swing components acting as progress indicators for
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175 * long-running actions.
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176 * <pre>
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177 * class X {
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178 * JLabel statusLabel = ...;
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179 *
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180 * int percentComplete = 0;
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181 * synchronized int getPercentComplete() { return percentComplete; }
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182 * synchronized void setPercentComplete(int p) { percentComplete = p; }
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183 *
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184 * ClockDaemon cd = ...;
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185 *
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186 * void startWorking() {
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187 * Runnable showPct = new Runnable() {
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188 * public void run() {
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189 * SwingUtilities.invokeLater(new Runnable() {
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190 * public void run() {
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191 * statusLabel.setText(getPercentComplete() + "%");
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192 * }
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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 * final Object updater = cd.executePeriodically(500, showPct, true);
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198 *
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199 * Runnable action = new Runnable() {
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200 * public void run() {
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201 * for (int i = 0; i < 100; ++i) {
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202 * work();
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203 * setPercentComplete(i);
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204 * }
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205 * cd.cancel(updater);
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206 * }
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207 * };
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208 *
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209 * new Thread(action).start();
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210 * }
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211 * }
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212 * </pre>
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213 * @param period -- the period, in milliseconds. Periods are
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214 * measured from start-of-task to the next start-of-task. It is
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215 * generally a bad idea to use a period that is shorter than
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216 * the expected task duration.
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217 * @param command -- the command to run at each cycle
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218 * @param startNow -- true if the cycle should start with execution
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219 * of the task now. Otherwise, the cycle starts with a delay of
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220 * <code>period</code> milliseconds.
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221 * @exception IllegalArgumentException if period less than or equal to zero.
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222 * @return taskID -- an opaque reference that can be used to cancel execution request
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223 **/
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224 public Object executePeriodically(long period,
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225 Runnable command,
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226 boolean startNow) {
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227
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228 if (period <= 0) throw new IllegalArgumentException();
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229
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230 long firstTime = System.currentTimeMillis();
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231 if (!startNow) firstTime += period;
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232
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233 TaskNode task = new TaskNode(firstTime, command, period);
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234 heap_.insert(task);
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235 restart();
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236 return task;
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237 }
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238
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239 /**
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240 * Cancel a scheduled task that has not yet been run.
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241 * The task will be cancelled
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242 * upon the <em>next</em> opportunity to run it. This has no effect if
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243 * this is a one-shot task that has already executed.
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244 * Also, if an execution is in progress, it will complete normally.
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245 * (It may however be interrupted via getThread().interrupt()).
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246 * But if it is a periodic task, future iterations are cancelled.
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247 * @param taskID -- a task reference returned by one of
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248 * the execute commands
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249 * @exception ClassCastException if the taskID argument is not
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250 * of the type returned by an execute command.
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251 **/
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252 public static void cancel(Object taskID) {
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253 ((TaskNode)taskID).setCancelled();
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254 }
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255
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256
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257 /** The thread used to process commands **/
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258 protected Thread thread_;
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259
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260
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261 /**
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262 * Return the thread being used to process commands, or
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263 * null if there is no such thread. You can use this
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264 * to invoke any special methods on the thread, for
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265 * example, to interrupt it.
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266 **/
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267 public synchronized Thread getThread() {
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268 return thread_;
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269 }
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270
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271 /** set thread_ to null to indicate termination **/
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272 protected synchronized void clearThread() {
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273 thread_ = null;
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274 }
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275
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276 /**
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277 * Start (or restart) a thread to process commands, or wake
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278 * up an existing thread if one is already running. This
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279 * method can be invoked if the background thread crashed
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280 * due to an unrecoverable exception in an executed command.
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281 **/
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282
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283 public synchronized void restart() {
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284 if (thread_ == null) {
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285 thread_ = threadFactory_.newThread(runLoop_);
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286 thread_.start();
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287 }
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288 else
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289 notify();
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290 }
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291
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292
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293 /**
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294 * Cancel all tasks and interrupt the background thread executing
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295 * the current task, if any.
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296 * A new background thread will be started if new execution
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297 * requests are encountered. If the currently executing task
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298 * does not repsond to interrupts, the current thread may persist, even
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299 * if a new thread is started via restart().
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300 **/
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301 public synchronized void shutDown() {
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302 heap_.clear();
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303 if (thread_ != null)
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304 thread_.interrupt();
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305 thread_ = null;
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306 }
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307
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308 /** Return the next task to execute, or null if thread is interrupted **/
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309 protected synchronized TaskNode nextTask() {
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310
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311 // Note: This code assumes that there is only one run loop thread
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312
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313 try {
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314 while (!Thread.interrupted()) {
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315
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316 // Using peek simplifies dealing with spurious wakeups
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317
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318 TaskNode task = (TaskNode)(heap_.peek());
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319
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320 if (task == null) {
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321 wait();
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322 }
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323 else {
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324 long now = System.currentTimeMillis();
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325 long when = task.getTimeToRun();
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326
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parents:
diff changeset
327 if (when > now) { // false alarm wakeup
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328 wait(when - now);
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Dan Creswell <dan.creswell@gmail.com>
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329 }
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330 else {
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331 task = (TaskNode)(heap_.extract());
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332
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diff changeset
333 if (!task.getCancelled()) { // Skip if cancelled by
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334
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diff changeset
335 if (task.period > 0) { // If periodic, requeue
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336 task.setTimeToRun(now + task.period);
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337 heap_.insert(task);
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Dan Creswell <dan.creswell@gmail.com>
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338 }
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339
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Dan Creswell <dan.creswell@gmail.com>
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340 return task;
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341 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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342 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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343 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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344 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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345 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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346 catch (InterruptedException ex) { } // fall through
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347
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Dan Creswell <dan.creswell@gmail.com>
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348 return null; // on interrupt
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349 }
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parents:
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350
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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351 /**
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352 * The runloop is isolated in its own Runnable class
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353 * just so that the main
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
354 * class need not implement Runnable, which would
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
355 * allow others to directly invoke run, which is not supported.
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parents:
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356 **/
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parents:
diff changeset
357
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
358 protected class RunLoop implements Runnable {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
359 public void run() {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
360 try {
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parents:
diff changeset
361 for (;;) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
362 TaskNode task = nextTask();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
363 if (task != null)
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
364 task.command.run();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
365 else
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
366 break;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
367 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
368 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
369 finally {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
370 clearThread();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
371 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
372 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
373 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
374
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
375 protected final RunLoop runLoop_;
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
376
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
377 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
378 * Create a new ClockDaemon
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379 **/
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
380
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
381 public ClockDaemon() {
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parents:
diff changeset
382 runLoop_ = new RunLoop();
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
383 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff changeset
384
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
385
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
386
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
387 }