Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/misc/SwingWorker.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* |
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2 File: SwingWorker.java |
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3 |
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4 Originally written by Joseph Bowbeer 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 |
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7 Originally part of jozart.swingutils. |
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8 Adapted for util.concurrent by Joseph Bowbeer. |
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9 |
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10 */ |
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11 |
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12 package EDU.oswego.cs.dl.util.concurrent.misc; |
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13 |
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14 import java.lang.reflect.InvocationTargetException; |
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15 import javax.swing.SwingUtilities; |
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16 |
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17 import EDU.oswego.cs.dl.util.concurrent.*; |
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18 |
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19 /** |
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20 * An abstract class that you subclass to perform GUI-related work |
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21 * in a dedicated thread. |
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22 * <p> |
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23 * This class was adapted from the SwingWorker written by Hans Muller |
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24 * and presented in "Using a Swing Worker Thread" in the Swing Connection |
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25 * - http://java.sun.com/products/jfc/tsc/articles/threads/threads2.html |
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26 * <p> |
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27 * A closely related version of this class is described in |
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28 * "The Last Word in Swing Threads" in the Swing Connection |
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29 * - http://java.sun.com/products/jfc/tsc/articles/threads/threads3.html |
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30 * <p> |
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31 * This SwingWorker is a ThreadFactoryUser and implements Runnable. The |
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32 * default thread factory creates low-priority worker threads. A special |
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33 * constructor is provided for enabling a timeout. When the timeout |
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34 * expires, the worker thread is interrupted. |
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35 * <p> |
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36 * Note: Using a timeout of <code>Long.MAX_VALUE</code> will not impose a |
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37 * timeout but will create an additional thread of control that will respond |
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38 * to an interrupt even if the <code>construct</code> implementation ignores |
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39 * them. |
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40 * <p> |
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41 * <b>Sample Usage</b> <p> |
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42 * <pre> |
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43 * import EDU.oswego.cs.dl.util.concurrent.TimeoutException; |
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44 * import EDU.oswego.cs.dl.util.concurrent.misc.SwingWorker; |
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45 * |
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46 * public class SwingWorkerDemo extends javax.swing.JApplet { |
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47 * |
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48 * private static final int TIMEOUT = 5000; // 5 seconds |
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49 * private javax.swing.JLabel status; |
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50 * private javax.swing.JButton start; |
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51 * private SwingWorker worker; |
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52 * |
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53 * public SwingWorkerDemo() { |
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54 * status = new javax.swing.JLabel("Ready"); |
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55 * status.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); |
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56 * getContentPane().add(status, java.awt.BorderLayout.CENTER); |
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57 * start = new javax.swing.JButton("Start"); |
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58 * getContentPane().add(start, java.awt.BorderLayout.SOUTH); |
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59 * |
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60 * start.addActionListener(new java.awt.event.ActionListener() { |
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61 * public void actionPerformed(java.awt.event.ActionEvent evt) { |
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62 * if (start.getText().equals("Start")) { |
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63 * start.setText("Stop"); |
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64 * status.setText("Working..."); |
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65 * worker = new DemoSwingWorker(TIMEOUT); |
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66 * worker.start(); |
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67 * } else { |
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68 * worker.interrupt(); |
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69 * } |
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70 * } |
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71 * }); |
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72 * } |
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73 * |
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74 * private class DemoSwingWorker extends SwingWorker { |
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75 * private static final java.util.Random RAND = new java.util.Random(); |
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76 * public DemoSwingWorker(long msecs) { |
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77 * super(msecs); |
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78 * } |
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79 * protected Object construct() throws InterruptedException { |
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80 * // Take a random nap. If we oversleep, the worker times out. |
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81 * Thread.sleep(RAND.nextInt(2*TIMEOUT)); |
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82 * return "Success"; |
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83 * } |
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84 * protected void finished() { |
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85 * start.setText("Start"); |
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86 * try { |
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87 * Object result = get(); |
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88 * status.setText((String) result); |
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89 * } |
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90 * catch (java.lang.reflect.InvocationTargetException e) { |
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91 * Throwable ex = e.getTargetException(); |
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92 * if (ex instanceof TimeoutException) { |
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93 * status.setText("Timed out."); |
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94 * } else if (ex instanceof InterruptedException) { |
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95 * status.setText("Interrupted."); |
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96 * } else { |
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97 * status.setText("Exception: " + ex); |
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98 * } |
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99 * } |
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100 * catch (InterruptedException ex) { |
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101 * // event-dispatch thread won't be interrupted |
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102 * throw new IllegalStateException(ex+""); |
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103 * } |
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104 * } |
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105 * } |
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106 * } |
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107 * </pre> |
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108 * |
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109 * @author Joseph Bowbeer |
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110 * @author Hans Muller |
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111 * @version 3.0 |
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112 * |
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113 * <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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114 */ |
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115 public abstract class SwingWorker extends ThreadFactoryUser |
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116 implements Runnable { |
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117 |
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118 /** Default thread factory. Creates low priority worker threads. */ |
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119 private static final ThreadFactory FACTORY = new ThreadFactory() { |
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120 public Thread newThread(Runnable command) { |
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121 Thread t = new Thread(command); |
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122 t.setPriority(Thread.MIN_PRIORITY+1); |
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123 return t; |
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124 } |
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125 }; |
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126 |
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127 /** Holds the value to be returned by the <code>get</code> method. */ |
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128 private final FutureResult result = new FutureResult(); |
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129 |
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130 /** Maximum time to wait for worker to complete. */ |
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131 private final long timeout; |
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132 |
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133 /** Worker thread. */ |
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134 private Thread thread; |
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135 |
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136 /** Creates new SwingWorker with no timeout. */ |
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137 public SwingWorker() { |
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138 this(FACTORY, 0); |
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139 } |
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140 |
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141 /** |
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142 * Creates new SwingWorker with specified timeout. |
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143 * @param msecs timeout in milliseconds, or <code>0</code> |
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144 * for no time limit. |
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145 */ |
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146 public SwingWorker(long msecs) { |
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147 this(FACTORY, msecs); |
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148 } |
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149 |
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150 /** |
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151 * Creates new SwingWorker with specified thread factory and timeout. |
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152 * @param factory factory for worker threads. |
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153 * @param msecs timeout in milliseconds, or <code>0</code> |
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154 * for no time limit. |
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155 */ |
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156 protected SwingWorker(ThreadFactory factory, long msecs) { |
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157 setThreadFactory(factory); |
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158 if (msecs < 0) { |
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159 throw new IllegalArgumentException("timeout="+msecs); |
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160 } |
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161 timeout = msecs; |
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162 } |
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163 |
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164 /** |
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165 * Computes the value to be returned by the <code>get</code> method. |
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166 */ |
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167 protected abstract Object construct() throws Exception; |
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168 |
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169 /** |
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170 * Called on the event dispatching thread (not on the worker thread) |
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171 * after the <code>construct</code> method has returned. |
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172 */ |
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173 protected void finished() { } |
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174 |
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175 /** |
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176 * Returns timeout period in milliseconds. Timeout is the |
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177 * maximum time to wait for worker to complete. There is |
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178 * no time limit if timeout is <code>0</code> (default). |
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179 */ |
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180 public long getTimeout() { |
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181 return timeout; |
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182 } |
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183 |
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184 /** |
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185 * Calls the <code>construct</code> method to compute the result, |
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186 * and then invokes the <code>finished</code> method on the event |
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187 * dispatch thread. |
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188 */ |
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189 public void run() { |
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190 |
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191 Callable function = new Callable() { |
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192 public Object call() throws Exception { |
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193 return construct(); |
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194 } |
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195 }; |
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196 |
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197 Runnable doFinished = new Runnable() { |
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198 public void run() { |
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199 finished(); |
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200 } |
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201 }; |
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202 |
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203 /* Convert to TimedCallable if timeout is specified. */ |
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204 long msecs = getTimeout(); |
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205 if (msecs != 0) { |
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206 TimedCallable tc = new TimedCallable(function, msecs); |
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207 tc.setThreadFactory(getThreadFactory()); |
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208 function = tc; |
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209 } |
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210 |
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211 result.setter(function).run(); |
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212 SwingUtilities.invokeLater(doFinished); |
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213 } |
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214 |
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215 /** |
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216 * Starts the worker thread. |
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217 */ |
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218 public synchronized void start() { |
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219 if (thread == null) { |
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220 thread = getThreadFactory().newThread(this); |
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221 } |
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222 thread.start(); |
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223 } |
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224 |
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225 /** |
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226 * Stops the worker and sets the exception to InterruptedException. |
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227 */ |
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228 public synchronized void interrupt() { |
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229 if (thread != null) { |
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230 /* Try-catch is workaround for JDK1.2 applet security bug. |
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231 On some platforms, a security exception is thrown if an |
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232 applet interrupts a thread that is no longer alive. */ |
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233 try { thread.interrupt(); } catch (Exception ex) { } |
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234 } |
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235 result.setException(new InterruptedException()); |
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236 } |
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237 |
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238 /** |
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239 * Return the value created by the <code>construct</code> method, |
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240 * waiting if necessary until it is ready. |
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241 * |
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242 * @return the value created by the <code>construct</code> method |
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243 * @exception InterruptedException if current thread was interrupted |
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244 * @exception InvocationTargetException if the constructing thread |
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245 * encountered an exception or was interrupted. |
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246 */ |
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247 public Object get() |
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248 throws InterruptedException, InvocationTargetException { |
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249 return result.get(); |
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250 } |
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251 |
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252 /** |
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253 * Wait at most msecs to access the constructed result. |
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254 * @return current value |
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255 * @exception TimeoutException if not ready after msecs |
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256 * @exception InterruptedException if current thread has been interrupted |
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257 * @exception InvocationTargetException if the constructing thread |
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258 * encountered an exception or was interrupted. |
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259 */ |
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260 public Object timedGet(long msecs) |
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261 throws TimeoutException, InterruptedException, InvocationTargetException { |
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262 return result.timedGet(msecs); |
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263 } |
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264 |
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265 /** |
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266 * Get the exception, or null if there isn't one (yet). |
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267 * This does not wait until the worker is ready, so should |
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268 * ordinarily only be called if you know it is. |
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269 * @return the exception encountered by the <code>construct</code> |
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270 * method wrapped in an InvocationTargetException |
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271 */ |
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272 public InvocationTargetException getException() { |
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273 return result.getException(); |
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274 } |
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275 |
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276 /** |
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277 * Return whether the <code>get</code> method is ready to |
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278 * return a value. |
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279 * |
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280 * @return true if a value or exception has been set. else false |
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281 */ |
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282 public boolean isReady() { |
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283 return result.isReady(); |
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284 } |
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285 |
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286 } |