Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/misc/SwingWorker.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: 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 }