| Line | Hits | Source |
|---|---|---|
| 1 | /** | |
| 2 | ||
| 3 | * This file was created by Sun Microsystems, Inc. | |
| 4 | ||
| 5 | */ | |
| 6 | ||
| 7 | /** | |
| 8 | ||
| 9 | * This is the 3rd version of SwingWorker (also known as | |
| 10 | ||
| 11 | * SwingWorker 3), an abstract class that you subclass to | |
| 12 | ||
| 13 | * perform GUI-related work in a dedicated thread. For | |
| 14 | ||
| 15 | * instructions on and examples of using this class, see: | |
| 16 | ||
| 17 | * | |
| 18 | ||
| 19 | * http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html | |
| 20 | ||
| 21 | * | |
| 22 | ||
| 23 | * Note that the API changed slightly in the 3rd version: | |
| 24 | ||
| 25 | * You must now invoke start() on the SwingWorker after | |
| 26 | ||
| 27 | * creating it. | |
| 28 | ||
| 29 | */ | |
| 30 | ||
| 31 | ||
| 32 | ||
| 33 | ||
| 34 | ||
| 35 | package net.sourceforge.demetrix.util; | |
| 36 | ||
| 37 | ||
| 38 | ||
| 39 | ||
| 40 | ||
| 41 | import javax.swing.SwingUtilities; | |
| 42 | ||
| 43 | ||
| 44 | ||
| 45 | 0 | public abstract class SwingWorker { |
| 46 | ||
| 47 | private Object value; // see getValue(), setValue() | |
| 48 | ||
| 49 | ||
| 50 | ||
| 51 | /** | |
| 52 | ||
| 53 | * Class to maintain reference to current worker thread | |
| 54 | ||
| 55 | * under separate synchronization control. | |
| 56 | ||
| 57 | */ | |
| 58 | ||
| 59 | private static class ThreadVar { | |
| 60 | ||
| 61 | private Thread thread; | |
| 62 | ||
| 63 | ThreadVar(Thread t) { thread = t; } | |
| 64 | ||
| 65 | synchronized Thread get() { return thread; } | |
| 66 | ||
| 67 | synchronized void clear() { thread = null; } | |
| 68 | ||
| 69 | } | |
| 70 | ||
| 71 | ||
| 72 | ||
| 73 | private ThreadVar threadVar; | |
| 74 | ||
| 75 | ||
| 76 | ||
| 77 | /** | |
| 78 | ||
| 79 | * Get the value produced by the worker thread, or null if it | |
| 80 | ||
| 81 | * hasn't been constructed yet. | |
| 82 | ||
| 83 | */ | |
| 84 | ||
| 85 | protected synchronized Object getValue() { | |
| 86 | ||
| 87 | 0 | return value; |
| 88 | ||
| 89 | } | |
| 90 | ||
| 91 | ||
| 92 | ||
| 93 | /** | |
| 94 | ||
| 95 | * Set the value produced by worker thread | |
| 96 | ||
| 97 | */ | |
| 98 | ||
| 99 | private synchronized void setValue(Object x) { | |
| 100 | ||
| 101 | 0 | value = x; |
| 102 | ||
| 103 | 0 | } |
| 104 | ||
| 105 | ||
| 106 | ||
| 107 | /** | |
| 108 | ||
| 109 | * Compute the value to be returned by the <code>get</code> method. | |
| 110 | ||
| 111 | */ | |
| 112 | ||
| 113 | public abstract Object construct(); | |
| 114 | ||
| 115 | ||
| 116 | ||
| 117 | /** | |
| 118 | ||
| 119 | * Called on the event dispatching thread (not on the worker thread) | |
| 120 | ||
| 121 | * after the <code>construct</code> method has returned. | |
| 122 | ||
| 123 | */ | |
| 124 | ||
| 125 | public void finished() { | |
| 126 | ||
| 127 | 0 | } |
| 128 | ||
| 129 | ||
| 130 | ||
| 131 | /** | |
| 132 | ||
| 133 | * A new method that interrupts the worker thread. Call this method | |
| 134 | ||
| 135 | * to force the worker to stop what it's doing. | |
| 136 | ||
| 137 | */ | |
| 138 | ||
| 139 | public void interrupt() { | |
| 140 | ||
| 141 | 0 | Thread t = threadVar.get(); |
| 142 | ||
| 143 | 0 | if (t != null) { |
| 144 | ||
| 145 | 0 | t.interrupt(); |
| 146 | ||
| 147 | } | |
| 148 | ||
| 149 | 0 | threadVar.clear(); |
| 150 | ||
| 151 | 0 | } |
| 152 | ||
| 153 | ||
| 154 | ||
| 155 | /** | |
| 156 | ||
| 157 | * Return the value created by the <code>construct</code> method. | |
| 158 | ||
| 159 | * Returns null if either the constructing thread or the current | |
| 160 | ||
| 161 | * thread was interrupted before a value was produced. | |
| 162 | ||
| 163 | * | |
| 164 | ||
| 165 | * @return the value created by the <code>construct</code> method | |
| 166 | ||
| 167 | */ | |
| 168 | ||
| 169 | public Object get() { | |
| 170 | ||
| 171 | while (true) { | |
| 172 | ||
| 173 | 0 | Thread t = threadVar.get(); |
| 174 | ||
| 175 | 0 | if (t == null) { |
| 176 | ||
| 177 | 0 | return getValue(); |
| 178 | ||
| 179 | } | |
| 180 | ||
| 181 | try { | |
| 182 | ||
| 183 | 0 | t.join(); |
| 184 | ||
| 185 | } | |
| 186 | ||
| 187 | 0 | catch (InterruptedException e) { |
| 188 | ||
| 189 | 0 | Thread.currentThread().interrupt(); // propagate |
| 190 | ||
| 191 | 0 | return null; |
| 192 | ||
| 193 | 0 | } |
| 194 | ||
| 195 | } | |
| 196 | ||
| 197 | } | |
| 198 | ||
| 199 | ||
| 200 | ||
| 201 | ||
| 202 | ||
| 203 | /** | |
| 204 | ||
| 205 | * Start a thread that will call the <code>construct</code> method | |
| 206 | ||
| 207 | * and then exit. | |
| 208 | ||
| 209 | */ | |
| 210 | ||
| 211 | 5 | public SwingWorker() { |
| 212 | ||
| 213 | 5 | final Runnable doFinished = new Runnable() { |
| 214 | ||
| 215 | public void run() { finished(); } | |
| 216 | ||
| 217 | }; | |
| 218 | ||
| 219 | ||
| 220 | ||
| 221 | 5 | Runnable doConstruct = new Runnable() { |
| 222 | ||
| 223 | public void run() { | |
| 224 | ||
| 225 | try { | |
| 226 | ||
| 227 | setValue(construct()); | |
| 228 | ||
| 229 | } | |
| 230 | ||
| 231 | finally { | |
| 232 | ||
| 233 | threadVar.clear(); | |
| 234 | ||
| 235 | } | |
| 236 | ||
| 237 | ||
| 238 | ||
| 239 | SwingUtilities.invokeLater(doFinished); | |
| 240 | ||
| 241 | } | |
| 242 | ||
| 243 | }; | |
| 244 | ||
| 245 | ||
| 246 | ||
| 247 | 5 | Thread t = new Thread(doConstruct); |
| 248 | ||
| 249 | 5 | threadVar = new ThreadVar(t); |
| 250 | ||
| 251 | 5 | } |
| 252 | ||
| 253 | ||
| 254 | ||
| 255 | /** | |
| 256 | ||
| 257 | * Start the worker thread. | |
| 258 | ||
| 259 | */ | |
| 260 | ||
| 261 | public void start() { | |
| 262 | ||
| 263 | 0 | Thread t = threadVar.get(); |
| 264 | ||
| 265 | 0 | if (t != null) { |
| 266 | ||
| 267 | 0 | t.start(); |
| 268 | ||
| 269 | } | |
| 270 | ||
| 271 | 0 | } |
| 272 | ||
| 273 | } |
|
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