Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/ClockDaemon.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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0
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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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327 if (when > now) { // false alarm wakeup |
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328 wait(when - now); |
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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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333 if (!task.getCancelled()) { // Skip if cancelled by |
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334 |
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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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338 } |
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339 |
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340 return task; |
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341 } |
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342 } |
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343 } |
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344 } |
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345 } |
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346 catch (InterruptedException ex) { } // fall through |
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347 |
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348 return null; // on interrupt |
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349 } |
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350 |
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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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354 * class need not implement Runnable, which would |
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355 * allow others to directly invoke run, which is not supported. |
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356 **/ |
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357 |
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358 protected class RunLoop implements Runnable { |
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359 public void run() { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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360 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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361 for (;;) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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362 TaskNode task = nextTask(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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363 if (task != null) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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364 task.command.run(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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365 else |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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366 break; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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367 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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368 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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369 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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370 clearThread(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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371 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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372 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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373 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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374 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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375 protected final RunLoop runLoop_; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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376 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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377 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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378 * Create a new ClockDaemon |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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379 **/ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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380 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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381 public ClockDaemon() { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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382 runLoop_ = new RunLoop(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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383 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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384 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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385 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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386 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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387 } |