Showing the changes to java/pkg/sun/awt/AppContext.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,793 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.awt; | ||
| 27 | |||
| 28 | import java.awt.EventQueue; | ||
| 29 | import java.awt.Window; | ||
| 30 | import java.awt.SystemTray; | ||
| 31 | import java.awt.TrayIcon; | ||
| 32 | import java.awt.Toolkit; | ||
| 33 | import java.awt.GraphicsEnvironment; | ||
| 34 | import java.awt.event.InvocationEvent; | ||
| 35 | import java.security.AccessController; | ||
| 36 | import java.security.PrivilegedAction; | ||
| 37 | import java.util.Collections; | ||
| 38 | import java.util.HashMap; | ||
| 39 | import java.util.IdentityHashMap; | ||
| 40 | import java.util.Map; | ||
| 41 | import java.util.Set; | ||
| 42 | import java.util.HashSet; | ||
| 43 | import java.beans.PropertyChangeSupport; | ||
| 44 | import java.beans.PropertyChangeListener; | ||
| 45 | import sun.util.logging.PlatformLogger; | ||
| 46 | import java.util.concurrent.locks.Condition; | ||
| 47 | import java.util.concurrent.locks.Lock; | ||
| 48 | import java.util.concurrent.locks.ReentrantLock; | ||
| 49 | |||
| 50 | /** | ||
| 51 | * The AppContext is a table referenced by ThreadGroup which stores | ||
| 52 | * application service instances. (If you are not writing an application | ||
| 53 | * service, or don't know what one is, please do not use this class.) | ||
| 54 | * The AppContext allows applet access to what would otherwise be | ||
| 55 | * potentially dangerous services, such as the ability to peek at | ||
| 56 | * EventQueues or change the look-and-feel of a Swing application.<p> | ||
| 57 | * | ||
| 58 | * Most application services use a singleton object to provide their | ||
| 59 | * services, either as a default (such as getSystemEventQueue or | ||
| 60 | * getDefaultToolkit) or as static methods with class data (System). | ||
| 61 | * The AppContext works with the former method by extending the concept | ||
| 62 | * of "default" to be ThreadGroup-specific. Application services | ||
| 63 | * lookup their singleton in the AppContext.<p> | ||
| 64 | * | ||
| 65 | * For example, here we have a Foo service, with its pre-AppContext | ||
| 66 | * code:<p> | ||
| 67 | * <code><pre> | ||
| 68 | * public class Foo { | ||
| 69 | * private static Foo defaultFoo = new Foo(); | ||
| 70 | * | ||
| 71 | * public static Foo getDefaultFoo() { | ||
| 72 | * return defaultFoo; | ||
| 73 | * } | ||
| 74 | * | ||
| 75 | * ... Foo service methods | ||
| 76 | * }</pre></code><p> | ||
| 77 | * | ||
| 78 | * The problem with the above is that the Foo service is global in scope, | ||
| 79 | * so that applets and other untrusted code can execute methods on the | ||
| 80 | * single, shared Foo instance. The Foo service therefore either needs | ||
| 81 | * to block its use by untrusted code using a SecurityManager test, or | ||
| 82 | * restrict its capabilities so that it doesn't matter if untrusted code | ||
| 83 | * executes it.<p> | ||
| 84 | * | ||
| 85 | * Here's the Foo class written to use the AppContext:<p> | ||
| 86 | * <code><pre> | ||
| 87 | * public class Foo { | ||
| 88 | * public static Foo getDefaultFoo() { | ||
| 89 | * Foo foo = (Foo)AppContext.getAppContext().get(Foo.class); | ||
| 90 | * if (foo == null) { | ||
| 91 | * foo = new Foo(); | ||
| 92 | * getAppContext().put(Foo.class, foo); | ||
| 93 | * } | ||
| 94 | * return foo; | ||
| 95 | * } | ||
| 96 | * | ||
| 97 | * ... Foo service methods | ||
| 98 | * }</pre></code><p> | ||
| 99 | * | ||
| 100 | * Since a separate AppContext can exist for each ThreadGroup, trusted | ||
| 101 | * and untrusted code have access to different Foo instances. This allows | ||
| 102 | * untrusted code access to "system-wide" services -- the service remains | ||
| 103 | * within the AppContext "sandbox". For example, say a malicious applet | ||
| 104 | * wants to peek all of the key events on the EventQueue to listen for | ||
| 105 | * passwords; if separate EventQueues are used for each ThreadGroup | ||
| 106 | * using AppContexts, the only key events that applet will be able to | ||
| 107 | * listen to are its own. A more reasonable applet request would be to | ||
| 108 | * change the Swing default look-and-feel; with that default stored in | ||
| 109 | * an AppContext, the applet's look-and-feel will change without | ||
| 110 | * disrupting other applets or potentially the browser itself.<p> | ||
| 111 | * | ||
| 112 | * Because the AppContext is a facility for safely extending application | ||
| 113 | * service support to applets, none of its methods may be blocked by a | ||
| 114 | * a SecurityManager check in a valid Java implementation. Applets may | ||
| 115 | * therefore safely invoke any of its methods without worry of being | ||
| 116 | * blocked. | ||
| 117 | * | ||
| 118 | * Note: If a SecurityManager is installed which derives from | ||
| 119 | * sun.awt.AWTSecurityManager, it may override the | ||
| 120 | * AWTSecurityManager.getAppContext() method to return the proper | ||
| 121 | * AppContext based on the execution context, in the case where | ||
| 122 | * the default ThreadGroup-based AppContext indexing would return | ||
| 123 | * the main "system" AppContext. For example, in an applet situation, | ||
| 124 | * if a system thread calls into an applet, rather than returning the | ||
| 125 | * main "system" AppContext (the one corresponding to the system thread), | ||
| 126 | * an installed AWTSecurityManager may return the applet's AppContext | ||
| 127 | * based on the execution context. | ||
| 128 | * | ||
| 129 | * @author Thomas Ball | ||
| 130 | * @author Fred Ecks | ||
| 131 | */ | ||
| 132 | public final class AppContext { | ||
| 133 | private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.AppContext"); | ||
| 134 | |||
| 135 | /* Since the contents of an AppContext are unique to each Java | ||
| 136 | * session, this class should never be serialized. */ | ||
| 137 | |||
| 138 | /* | ||
| 139 | * The key to put()/get() the Java EventQueue into/from the AppContext. | ||
| 140 | */ | ||
| 141 | public static final Object EVENT_QUEUE_KEY = new StringBuffer("EventQueue"); | ||
| 142 | |||
| 143 | /* | ||
| 144 | * The keys to store EventQueue push/pop lock and condition. | ||
| 145 | */ | ||
| 146 | public final static Object EVENT_QUEUE_LOCK_KEY = new StringBuilder("EventQueue.Lock"); | ||
| 147 | public final static Object EVENT_QUEUE_COND_KEY = new StringBuilder("EventQueue.Condition"); | ||
| 148 | |||
| 149 | /* A map of AppContexts, referenced by ThreadGroup. | ||
| 150 | */ | ||
| 151 | private static final Map<ThreadGroup, AppContext> threadGroup2appContext = | ||
| 152 | Collections.synchronizedMap(new IdentityHashMap<ThreadGroup, AppContext>()); | ||
| 153 | |||
| 154 | /** | ||
| 155 | * Returns a set containing all <code>AppContext</code>s. | ||
| 156 | */ | ||
| 157 | public static Set<AppContext> getAppContexts() { | ||
| 158 | synchronized (threadGroup2appContext) { | ||
| 159 | return new HashSet<AppContext>(threadGroup2appContext.values()); | ||
| 160 | } | ||
| 161 | } | ||
| 162 | |||
| 163 | /* The main "system" AppContext, used by everything not otherwise | ||
| 164 | contained in another AppContext. | ||
| 165 | */ | ||
| 166 | private static volatile AppContext mainAppContext = null; | ||
| 167 | |||
| 168 | /* | ||
| 169 | * The hash map associated with this AppContext. A private delegate | ||
| 170 | * is used instead of subclassing HashMap so as to avoid all of | ||
| 171 | * HashMap's potentially risky methods, such as clear(), elements(), | ||
| 172 | * putAll(), etc. | ||
| 173 | */ | ||
| 174 | private final HashMap table = new HashMap(); | ||
| 175 | |||
| 176 | private final ThreadGroup threadGroup; | ||
| 177 | |||
| 178 | /** | ||
| 179 | * If any <code>PropertyChangeListeners</code> have been registered, | ||
| 180 | * the <code>changeSupport</code> field describes them. | ||
| 181 | * | ||
| 182 | * @see #addPropertyChangeListener | ||
| 183 | * @see #removePropertyChangeListener | ||
| 184 | * @see #firePropertyChange | ||
| 185 | */ | ||
| 186 | private PropertyChangeSupport changeSupport = null; | ||
| 187 | |||
| 188 | public static final String DISPOSED_PROPERTY_NAME = "disposed"; | ||
| 189 | public static final String GUI_DISPOSED = "guidisposed"; | ||
| 190 | |||
| 191 | private volatile boolean isDisposed = false; // true if AppContext is disposed | ||
| 192 | |||
| 193 | public boolean isDisposed() { | ||
| 194 | return isDisposed; | ||
| 195 | } | ||
| 196 | |||
| 197 | static { | ||
| 198 | // On the main Thread, we get the ThreadGroup, make a corresponding | ||
| 199 | // AppContext, and instantiate the Java EventQueue. This way, legacy | ||
| 200 | // code is unaffected by the move to multiple AppContext ability. | ||
| 201 | AccessController.doPrivileged(new PrivilegedAction() { | ||
| 202 | public Object run() { | ||
| 203 | ThreadGroup currentThreadGroup = | ||
| 204 | Thread.currentThread().getThreadGroup(); | ||
| 205 | ThreadGroup parentThreadGroup = currentThreadGroup.getParent(); | ||
| 206 | while (parentThreadGroup != null) { | ||
| 207 | // Find the root ThreadGroup to construct our main AppContext | ||
| 208 | currentThreadGroup = parentThreadGroup; | ||
| 209 | parentThreadGroup = currentThreadGroup.getParent(); | ||
| 210 | } | ||
| 211 | mainAppContext = new AppContext(currentThreadGroup); | ||
| 212 | numAppContexts = 1; | ||
| 213 | return mainAppContext; | ||
| 214 | } | ||
| 215 | }); | ||
| 216 | } | ||
| 217 | |||
| 218 | /* | ||
| 219 | * The total number of AppContexts, system-wide. This number is | ||
| 220 | * incremented at the beginning of the constructor, and decremented | ||
| 221 | * at the end of dispose(). getAppContext() checks to see if this | ||
| 222 | * number is 1. If so, it returns the sole AppContext without | ||
| 223 | * checking Thread.currentThread(). | ||
| 224 | */ | ||
| 225 | private static volatile int numAppContexts; | ||
| 226 | |||
| 227 | /* | ||
| 228 | * The context ClassLoader that was used to create this AppContext. | ||
| 229 | */ | ||
| 230 | private final ClassLoader contextClassLoader; | ||
| 231 | |||
| 232 | /** | ||
| 233 | * Constructor for AppContext. This method is <i>not</i> public, | ||
| 234 | * nor should it ever be used as such. The proper way to construct | ||
| 235 | * an AppContext is through the use of SunToolkit.createNewAppContext. | ||
| 236 | * A ThreadGroup is created for the new AppContext, a Thread is | ||
| 237 | * created within that ThreadGroup, and that Thread calls | ||
| 238 | * SunToolkit.createNewAppContext before calling anything else. | ||
| 239 | * That creates both the new AppContext and its EventQueue. | ||
| 240 | * | ||
| 241 | * @param threadGroup The ThreadGroup for the new AppContext | ||
| 242 | * @see sun.awt.SunToolkit | ||
| 243 | * @since 1.2 | ||
| 244 | */ | ||
| 245 | AppContext(ThreadGroup threadGroup) { | ||
| 246 | numAppContexts++; | ||
| 247 | |||
| 248 | this.threadGroup = threadGroup; | ||
| 249 | threadGroup2appContext.put(threadGroup, this); | ||
| 250 | |||
| 251 | this.contextClassLoader = | ||
| 252 | AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { | ||
| 253 | public ClassLoader run() { | ||
| 254 | return Thread.currentThread().getContextClassLoader(); | ||
| 255 | } | ||
| 256 | }); | ||
| 257 | |||
| 258 | // Initialize push/pop lock and its condition to be used by all the | ||
| 259 | // EventQueues within this AppContext | ||
| 260 | Lock eventQueuePushPopLock = new ReentrantLock(); | ||
| 261 | put(EVENT_QUEUE_LOCK_KEY, eventQueuePushPopLock); | ||
| 262 | Condition eventQueuePushPopCond = eventQueuePushPopLock.newCondition(); | ||
| 263 | put(EVENT_QUEUE_COND_KEY, eventQueuePushPopCond); | ||
| 264 | } | ||
| 265 | |||
| 266 | private static final ThreadLocal<AppContext> threadAppContext = | ||
| 267 | new ThreadLocal<AppContext>(); | ||
| 268 | |||
| 269 | /** | ||
| 270 | * Returns the appropriate AppContext for the caller, | ||
| 271 | * as determined by its ThreadGroup. If the main "system" AppContext | ||
| 272 | * would be returned and there's an AWTSecurityManager installed, it | ||
| 273 | * is called to get the proper AppContext based on the execution | ||
| 274 | * context. | ||
| 275 | * | ||
| 276 | * @return the AppContext for the caller. | ||
| 277 | * @see java.lang.ThreadGroup | ||
| 278 | * @since 1.2 | ||
| 279 | */ | ||
| 280 | public final static AppContext getAppContext() { | ||
| 281 | if (numAppContexts == 1) // If there's only one system-wide, | ||
| 282 | return mainAppContext; // return the main system AppContext. | ||
| 283 | |||
| 284 | AppContext appContext = threadAppContext.get(); | ||
| 285 | |||
| 286 | if (null == appContext) { | ||
| 287 | appContext = AccessController.doPrivileged(new PrivilegedAction<AppContext>() | ||
| 288 | { | ||
| 289 | public AppContext run() { | ||
| 290 | // Get the current ThreadGroup, and look for it and its | ||
| 291 | // parents in the hash from ThreadGroup to AppContext -- | ||
| 292 | // it should be found, because we use createNewContext() | ||
| 293 | // when new AppContext objects are created. | ||
| 294 | ThreadGroup currentThreadGroup = Thread.currentThread().getThreadGroup(); | ||
| 295 | ThreadGroup threadGroup = currentThreadGroup; | ||
| 296 | AppContext context = threadGroup2appContext.get(threadGroup); | ||
| 297 | while (context == null) { | ||
| 298 | threadGroup = threadGroup.getParent(); | ||
| 299 | if (threadGroup == null) { | ||
| 300 | // If we get here, we're running under a ThreadGroup that | ||
| 301 | // has no AppContext associated with it. This should never | ||
| 302 | // happen, because createNewContext() should be used by the | ||
| 303 | // toolkit to create the ThreadGroup that everything runs | ||
| 304 | // under. | ||
| 305 | throw new RuntimeException("Invalid ThreadGroup"); | ||
| 306 | } | ||
| 307 | context = threadGroup2appContext.get(threadGroup); | ||
| 308 | } | ||
| 309 | // In case we did anything in the above while loop, we add | ||
| 310 | // all the intermediate ThreadGroups to threadGroup2appContext | ||
| 311 | // so we won't spin again. | ||
| 312 | for (ThreadGroup tg = currentThreadGroup; tg != threadGroup; tg = tg.getParent()) { | ||
| 313 | threadGroup2appContext.put(tg, context); | ||
| 314 | } | ||
| 315 | // Now we're done, so we cache the latest key/value pair. | ||
| 316 | // (we do this before checking with any AWTSecurityManager, so if | ||
| 317 | // this Thread equates with the main AppContext in the cache, it | ||
| 318 | // still will) | ||
| 319 | threadAppContext.set(context); | ||
| 320 | |||
| 321 | return context; | ||
| 322 | } | ||
| 323 | }); | ||
| 324 | } | ||
| 325 | |||
| 326 | if (appContext == mainAppContext) { | ||
| 327 | // Before we return the main "system" AppContext, check to | ||
| 328 | // see if there's an AWTSecurityManager installed. If so, | ||
| 329 | // allow it to choose the AppContext to return. | ||
| 330 | SecurityManager securityManager = System.getSecurityManager(); | ||
| 331 | if ((securityManager != null) && | ||
| 332 | (securityManager instanceof AWTSecurityManager)) | ||
| 333 | { | ||
| 334 | AWTSecurityManager awtSecMgr = (AWTSecurityManager)securityManager; | ||
| 335 | AppContext secAppContext = awtSecMgr.getAppContext(); | ||
| 336 | if (secAppContext != null) { | ||
| 337 | appContext = secAppContext; // Return what we're told | ||
| 338 | } | ||
| 339 | } | ||
| 340 | } | ||
| 341 | |||
| 342 | return appContext; | ||
| 343 | } | ||
| 344 | |||
| 345 | private long DISPOSAL_TIMEOUT = 5000; // Default to 5-second timeout | ||
| 346 | // for disposal of all Frames | ||
| 347 | // (we wait for this time twice, | ||
| 348 | // once for dispose(), and once | ||
| 349 | // to clear the EventQueue). | ||
| 350 | |||
| 351 | private long THREAD_INTERRUPT_TIMEOUT = 1000; | ||
| 352 | // Default to 1-second timeout for all | ||
| 353 | // interrupted Threads to exit, and another | ||
| 354 | // 1 second for all stopped Threads to die. | ||
| 355 | |||
| 356 | /** | ||
| 357 | * Disposes of this AppContext, all of its top-level Frames, and | ||
| 358 | * all Threads and ThreadGroups contained within it. | ||
| 359 | * | ||
| 360 | * This method must be called from a Thread which is not contained | ||
| 361 | * within this AppContext. | ||
| 362 | * | ||
| 363 | * @exception IllegalThreadStateException if the current thread is | ||
| 364 | * contained within this AppContext | ||
| 365 | * @since 1.2 | ||
| 366 | */ | ||
| 367 | public void dispose() throws IllegalThreadStateException { | ||
| 368 | // Check to be sure that the current Thread isn't in this AppContext | ||
| 369 | if (this.threadGroup.parentOf(Thread.currentThread().getThreadGroup())) { | ||
| 370 | throw new IllegalThreadStateException( | ||
| 371 | "Current Thread is contained within AppContext to be disposed." | ||
| 372 | ); | ||
| 373 | } | ||
| 374 | |||
| 375 | synchronized(this) { | ||
| 376 | if (this.isDisposed) { | ||
| 377 | return; // If already disposed, bail. | ||
| 378 | } | ||
| 379 | this.isDisposed = true; | ||
| 380 | } | ||
| 381 | |||
| 382 | final PropertyChangeSupport changeSupport = this.changeSupport; | ||
| 383 | if (changeSupport != null) { | ||
| 384 | changeSupport.firePropertyChange(DISPOSED_PROPERTY_NAME, false, true); | ||
| 385 | } | ||
| 386 | |||
| 387 | // First, we post an InvocationEvent to be run on the | ||
| 388 | // EventDispatchThread which disposes of all top-level Frames and TrayIcons | ||
| 389 | |||
| 390 | final Object notificationLock = new Object(); | ||
| 391 | |||
| 392 | Runnable runnable = new Runnable() { | ||
| 393 | public void run() { | ||
| 394 | Window[] windowsToDispose = Window.getOwnerlessWindows(); | ||
| 395 | for (Window w : windowsToDispose) { | ||
| 396 | try { | ||
| 397 | w.dispose(); | ||
| 398 | } catch (Throwable t) { | ||
| 399 | log.finer("exception occured while disposing app context", t); | ||
| 400 | } | ||
| 401 | } | ||
| 402 | AccessController.doPrivileged(new PrivilegedAction() { | ||
| 403 | public Object run() { | ||
| 404 | if (!GraphicsEnvironment.isHeadless() && SystemTray.isSupported()) | ||
| 405 | { | ||
| 406 | SystemTray systemTray = SystemTray.getSystemTray(); | ||
| 407 | TrayIcon[] trayIconsToDispose = systemTray.getTrayIcons(); | ||
| 408 | for (TrayIcon ti : trayIconsToDispose) { | ||
| 409 | systemTray.remove(ti); | ||
| 410 | } | ||
| 411 | } | ||
| 412 | return null; | ||
| 413 | } | ||
| 414 | }); | ||
| 415 | // Alert PropertyChangeListeners that the GUI has been disposed. | ||
| 416 | if (changeSupport != null) { | ||
| 417 | changeSupport.firePropertyChange(GUI_DISPOSED, false, true); | ||
| 418 | } | ||
| 419 | synchronized(notificationLock) { | ||
| 420 | notificationLock.notifyAll(); // Notify caller that we're done | ||
| 421 | } | ||
| 422 | } | ||
| 423 | }; | ||
| 424 | synchronized(notificationLock) { | ||
| 425 | SunToolkit.postEvent(this, | ||
| 426 | new InvocationEvent(Toolkit.getDefaultToolkit(), runnable)); | ||
| 427 | try { | ||
| 428 | notificationLock.wait(DISPOSAL_TIMEOUT); | ||
| 429 | } catch (InterruptedException e) { } | ||
| 430 | } | ||
| 431 | |||
| 432 | // Next, we post another InvocationEvent to the end of the | ||
| 433 | // EventQueue. When it's executed, we know we've executed all | ||
| 434 | // events in the queue. | ||
| 435 | |||
| 436 | runnable = new Runnable() { public void run() { | ||
| 437 | synchronized(notificationLock) { | ||
| 438 | notificationLock.notifyAll(); // Notify caller that we're done | ||
| 439 | } | ||
| 440 | } }; | ||
| 441 | synchronized(notificationLock) { | ||
| 442 | SunToolkit.postEvent(this, | ||
| 443 | new InvocationEvent(Toolkit.getDefaultToolkit(), runnable)); | ||
| 444 | try { | ||
| 445 | notificationLock.wait(DISPOSAL_TIMEOUT); | ||
| 446 | } catch (InterruptedException e) { } | ||
| 447 | } | ||
| 448 | |||
| 449 | // Next, we interrupt all Threads in the ThreadGroup | ||
| 450 | this.threadGroup.interrupt(); | ||
| 451 | // Note, the EventDispatchThread we've interrupted may dump an | ||
| 452 | // InterruptedException to the console here. This needs to be | ||
| 453 | // fixed in the EventDispatchThread, not here. | ||
| 454 | |||
| 455 | // Next, we sleep 10ms at a time, waiting for all of the active | ||
| 456 | // Threads in the ThreadGroup to exit. | ||
| 457 | |||
| 458 | long startTime = System.currentTimeMillis(); | ||
| 459 | long endTime = startTime + THREAD_INTERRUPT_TIMEOUT; | ||
| 460 | while ((this.threadGroup.activeCount() > 0) && | ||
| 461 | (System.currentTimeMillis() < endTime)) { | ||
| 462 | try { | ||
| 463 | Thread.sleep(10); | ||
| 464 | } catch (InterruptedException e) { } | ||
| 465 | } | ||
| 466 | |||
| 467 | // Then, we stop any remaining Threads | ||
| 468 | this.threadGroup.stop(); | ||
| 469 | |||
| 470 | // Next, we sleep 10ms at a time, waiting for all of the active | ||
| 471 | // Threads in the ThreadGroup to die. | ||
| 472 | |||
| 473 | startTime = System.currentTimeMillis(); | ||
| 474 | endTime = startTime + THREAD_INTERRUPT_TIMEOUT; | ||
| 475 | while ((this.threadGroup.activeCount() > 0) && | ||
| 476 | (System.currentTimeMillis() < endTime)) { | ||
| 477 | try { | ||
| 478 | Thread.sleep(10); | ||
| 479 | } catch (InterruptedException e) { } | ||
| 480 | } | ||
| 481 | |||
| 482 | // Next, we remove this and all subThreadGroups from threadGroup2appContext | ||
| 483 | int numSubGroups = this.threadGroup.activeGroupCount(); | ||
| 484 | if (numSubGroups > 0) { | ||
| 485 | ThreadGroup [] subGroups = new ThreadGroup[numSubGroups]; | ||
| 486 | numSubGroups = this.threadGroup.enumerate(subGroups); | ||
| 487 | for (int subGroup = 0; subGroup < numSubGroups; subGroup++) { | ||
| 488 | threadGroup2appContext.remove(subGroups[subGroup]); | ||
| 489 | } | ||
| 490 | } | ||
| 491 | threadGroup2appContext.remove(this.threadGroup); | ||
| 492 | |||
| 493 | threadAppContext.set(null); | ||
| 494 | |||
| 495 | // Finally, we destroy the ThreadGroup entirely. | ||
| 496 | try { | ||
| 497 | this.threadGroup.destroy(); | ||
| 498 | } catch (IllegalThreadStateException e) { | ||
| 499 | // Fired if not all the Threads died, ignore it and proceed | ||
| 500 | } | ||
| 501 | |||
| 502 | synchronized (table) { | ||
| 503 | this.table.clear(); // Clear out the Hashtable to ease garbage collection | ||
| 504 | } | ||
| 505 | |||
| 506 | numAppContexts--; | ||
| 507 | |||
| 508 | mostRecentKeyValue = null; | ||
| 509 | } | ||
| 510 | |||
| 511 | static final class PostShutdownEventRunnable implements Runnable { | ||
| 512 | private final AppContext appContext; | ||
| 513 | |||
| 514 | public PostShutdownEventRunnable(AppContext ac) { | ||
| 515 | appContext = ac; | ||
| 516 | } | ||
| 517 | |||
| 518 | public void run() { | ||
| 519 | final EventQueue eq = (EventQueue)appContext.get(EVENT_QUEUE_KEY); | ||
| 520 | if (eq != null) { | ||
| 521 | eq.postEvent(AWTAutoShutdown.getShutdownEvent()); | ||
| 522 | } | ||
| 523 | } | ||
| 524 | } | ||
| 525 | |||
| 526 | static final class CreateThreadAction implements PrivilegedAction { | ||
| 527 | private final AppContext appContext; | ||
| 528 | private final Runnable runnable; | ||
| 529 | |||
| 530 | public CreateThreadAction(AppContext ac, Runnable r) { | ||
| 531 | appContext = ac; | ||
| 532 | runnable = r; | ||
| 533 | } | ||
| 534 | |||
| 535 | public Object run() { | ||
| 536 | Thread t = new Thread(appContext.getThreadGroup(), runnable); | ||
| 537 | t.setContextClassLoader(appContext.getContextClassLoader()); | ||
| 538 | t.setPriority(Thread.NORM_PRIORITY + 1); | ||
| 539 | t.setDaemon(true); | ||
| 540 | return t; | ||
| 541 | } | ||
| 542 | } | ||
| 543 | |||
| 544 | static void stopEventDispatchThreads() { | ||
| 545 | for (AppContext appContext: getAppContexts()) { | ||
| 546 | if (appContext.isDisposed()) { | ||
| 547 | continue; | ||
| 548 | } | ||
| 549 | Runnable r = new PostShutdownEventRunnable(appContext); | ||
| 550 | // For security reasons EventQueue.postEvent should only be called | ||
| 551 | // on a thread that belongs to the corresponding thread group. | ||
| 552 | if (appContext != AppContext.getAppContext()) { | ||
| 553 | // Create a thread that belongs to the thread group associated | ||
| 554 | // with the AppContext and invokes EventQueue.postEvent. | ||
| 555 | PrivilegedAction action = new CreateThreadAction(appContext, r); | ||
| 556 | Thread thread = (Thread)AccessController.doPrivileged(action); | ||
| 557 | thread.start(); | ||
| 558 | } else { | ||
| 559 | r.run(); | ||
| 560 | } | ||
| 561 | } | ||
| 562 | } | ||
| 563 | |||
| 564 | private MostRecentKeyValue mostRecentKeyValue = null; | ||
| 565 | private MostRecentKeyValue shadowMostRecentKeyValue = null; | ||
| 566 | |||
| 567 | /** | ||
| 568 | * Returns the value to which the specified key is mapped in this context. | ||
| 569 | * | ||
| 570 | * @param key a key in the AppContext. | ||
| 571 | * @return the value to which the key is mapped in this AppContext; | ||
| 572 | * <code>null</code> if the key is not mapped to any value. | ||
| 573 | * @see #put(Object, Object) | ||
| 574 | * @since 1.2 | ||
| 575 | */ | ||
| 576 | public Object get(Object key) { | ||
| 577 | /* | ||
| 578 | * The most recent reference should be updated inside a synchronized | ||
| 579 | * block to avoid a race when put() and get() are executed in | ||
| 580 | * parallel on different threads. | ||
| 581 | */ | ||
| 582 | synchronized (table) { | ||
| 583 | // Note: this most recent key/value caching is thread-hot. | ||
| 584 | // A simple test using SwingSet found that 72% of lookups | ||
| 585 | // were matched using the most recent key/value. By instantiating | ||
| 586 | // a simple MostRecentKeyValue object on cache misses, the | ||
| 587 | // cache hits can be processed without synchronization. | ||
| 588 | |||
| 589 | MostRecentKeyValue recent = mostRecentKeyValue; | ||
| 590 | if ((recent != null) && (recent.key == key)) { | ||
| 591 | return recent.value; | ||
| 592 | } | ||
| 593 | |||
| 594 | Object value = table.get(key); | ||
| 595 | if(mostRecentKeyValue == null) { | ||
| 596 | mostRecentKeyValue = new MostRecentKeyValue(key, value); | ||
| 597 | shadowMostRecentKeyValue = new MostRecentKeyValue(key, value); | ||
| 598 | } else { | ||
| 599 | MostRecentKeyValue auxKeyValue = mostRecentKeyValue; | ||
| 600 | shadowMostRecentKeyValue.setPair(key, value); | ||
| 601 | mostRecentKeyValue = shadowMostRecentKeyValue; | ||
| 602 | shadowMostRecentKeyValue = auxKeyValue; | ||
| 603 | } | ||
| 604 | return value; | ||
| 605 | } | ||
| 606 | } | ||
| 607 | |||
| 608 | /** | ||
| 609 | * Maps the specified <code>key</code> to the specified | ||
| 610 | * <code>value</code> in this AppContext. Neither the key nor the | ||
| 611 | * value can be <code>null</code>. | ||
| 612 | * <p> | ||
| 613 | * The value can be retrieved by calling the <code>get</code> method | ||
| 614 | * with a key that is equal to the original key. | ||
| 615 | * | ||
| 616 | * @param key the AppContext key. | ||
| 617 | * @param value the value. | ||
| 618 | * @return the previous value of the specified key in this | ||
| 619 | * AppContext, or <code>null</code> if it did not have one. | ||
| 620 | * @exception NullPointerException if the key or value is | ||
| 621 | * <code>null</code>. | ||
| 622 | * @see #get(Object) | ||
| 623 | * @since 1.2 | ||
| 624 | */ | ||
| 625 | public Object put(Object key, Object value) { | ||
| 626 | synchronized (table) { | ||
| 627 | MostRecentKeyValue recent = mostRecentKeyValue; | ||
| 628 | if ((recent != null) && (recent.key == key)) | ||
| 629 | recent.value = value; | ||
| 630 | return table.put(key, value); | ||
| 631 | } | ||
| 632 | } | ||
| 633 | |||
| 634 | /** | ||
| 635 | * Removes the key (and its corresponding value) from this | ||
| 636 | * AppContext. This method does nothing if the key is not in the | ||
| 637 | * AppContext. | ||
| 638 | * | ||
| 639 | * @param key the key that needs to be removed. | ||
| 640 | * @return the value to which the key had been mapped in this AppContext, | ||
| 641 | * or <code>null</code> if the key did not have a mapping. | ||
| 642 | * @since 1.2 | ||
| 643 | */ | ||
| 644 | public Object remove(Object key) { | ||
| 645 | synchronized (table) { | ||
| 646 | MostRecentKeyValue recent = mostRecentKeyValue; | ||
| 647 | if ((recent != null) && (recent.key == key)) | ||
| 648 | recent.value = null; | ||
| 649 | return table.remove(key); | ||
| 650 | } | ||
| 651 | } | ||
| 652 | |||
| 653 | /** | ||
| 654 | * Returns the root ThreadGroup for all Threads contained within | ||
| 655 | * this AppContext. | ||
| 656 | * @since 1.2 | ||
| 657 | */ | ||
| 658 | public ThreadGroup getThreadGroup() { | ||
| 659 | return threadGroup; | ||
| 660 | } | ||
| 661 | |||
| 662 | /** | ||
| 663 | * Returns the context ClassLoader that was used to create this | ||
| 664 | * AppContext. | ||
| 665 | * | ||
| 666 | * @see java.lang.Thread#getContextClassLoader | ||
| 667 | */ | ||
| 668 | public ClassLoader getContextClassLoader() { | ||
| 669 | return contextClassLoader; | ||
| 670 | } | ||
| 671 | |||
| 672 | /** | ||
| 673 | * Returns a string representation of this AppContext. | ||
| 674 | * @since 1.2 | ||
| 675 | */ | ||
| 676 | @Override | ||
| 677 | public String toString() { | ||
| 678 | return getClass().getName() + "[threadGroup=" + threadGroup.getName() + "]"; | ||
| 679 | } | ||
| 680 | |||
| 681 | /** | ||
| 682 | * Returns an array of all the property change listeners | ||
| 683 | * registered on this component. | ||
| 684 | * | ||
| 685 | * @return all of this component's <code>PropertyChangeListener</code>s | ||
| 686 | * or an empty array if no property change | ||
| 687 | * listeners are currently registered | ||
| 688 | * | ||
| 689 | * @see #addPropertyChangeListener | ||
| 690 | * @see #removePropertyChangeListener | ||
| 691 | * @see #getPropertyChangeListeners(java.lang.String) | ||
| 692 | * @see java.beans.PropertyChangeSupport#getPropertyChangeListeners | ||
| 693 | * @since 1.4 | ||
| 694 | */ | ||
| 695 | public synchronized PropertyChangeListener[] getPropertyChangeListeners() { | ||
| 696 | if (changeSupport == null) { | ||
| 697 | return new PropertyChangeListener[0]; | ||
| 698 | } | ||
| 699 | return changeSupport.getPropertyChangeListeners(); | ||
| 700 | } | ||
| 701 | |||
| 702 | /** | ||
| 703 | * Adds a PropertyChangeListener to the listener list for a specific | ||
| 704 | * property. The specified property may be one of the following: | ||
| 705 | * <ul> | ||
| 706 | * <li>if this AppContext is disposed ("disposed")</li> | ||
| 707 | * </ul> | ||
| 708 | * <ul> | ||
| 709 | * <li>if this AppContext's unowned Windows have been disposed | ||
| 710 | * ("guidisposed"). Code to cleanup after the GUI is disposed | ||
| 711 | * (such as LookAndFeel.uninitialize()) should execute in response to | ||
| 712 | * this property being fired. Notifications for the "guidisposed" | ||
| 713 | * property are sent on the event dispatch thread.</li> | ||
| 714 | * </ul> | ||
| 715 | * <p> | ||
| 716 | * If listener is null, no exception is thrown and no action is performed. | ||
| 717 | * | ||
| 718 | * @param propertyName one of the property names listed above | ||
| 719 | * @param listener the PropertyChangeListener to be added | ||
| 720 | * | ||
| 721 | * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) | ||
| 722 | * @see #getPropertyChangeListeners(java.lang.String) | ||
| 723 | * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) | ||
| 724 | */ | ||
| 725 | public synchronized void addPropertyChangeListener( | ||
| 726 | String propertyName, | ||
| 727 | PropertyChangeListener listener) { | ||
| 728 | if (listener == null) { | ||
| 729 | return; | ||
| 730 | } | ||
| 731 | if (changeSupport == null) { | ||
| 732 | changeSupport = new PropertyChangeSupport(this); | ||
| 733 | } | ||
| 734 | changeSupport.addPropertyChangeListener(propertyName, listener); | ||
| 735 | } | ||
| 736 | |||
| 737 | /** | ||
| 738 | * Removes a PropertyChangeListener from the listener list for a specific | ||
| 739 | * property. This method should be used to remove PropertyChangeListeners | ||
| 740 | * that were registered for a specific bound property. | ||
| 741 | * <p> | ||
| 742 | * If listener is null, no exception is thrown and no action is performed. | ||
| 743 | * | ||
| 744 | * @param propertyName a valid property name | ||
| 745 | * @param listener the PropertyChangeListener to be removed | ||
| 746 | * | ||
| 747 | * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) | ||
| 748 | * @see #getPropertyChangeListeners(java.lang.String) | ||
| 749 | * @see #removePropertyChangeListener(java.beans.PropertyChangeListener) | ||
| 750 | */ | ||
| 751 | public synchronized void removePropertyChangeListener( | ||
| 752 | String propertyName, | ||
| 753 | PropertyChangeListener listener) { | ||
| 754 | if (listener == null || changeSupport == null) { | ||
| 755 | return; | ||
| 756 | } | ||
| 757 | changeSupport.removePropertyChangeListener(propertyName, listener); | ||
| 758 | } | ||
| 759 | |||
| 760 | /** | ||
| 761 | * Returns an array of all the listeners which have been associated | ||
| 762 | * with the named property. | ||
| 763 | * | ||
| 764 | * @return all of the <code>PropertyChangeListeners</code> associated with | ||
| 765 | * the named property or an empty array if no listeners have | ||
| 766 | * been added | ||
| 767 | * | ||
| 768 | * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) | ||
| 769 | * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener) | ||
| 770 | * @see #getPropertyChangeListeners | ||
| 771 | * @since 1.4 | ||
| 772 | */ | ||
| 773 | public synchronized PropertyChangeListener[] getPropertyChangeListeners( | ||
| 774 | String propertyName) { | ||
| 775 | if (changeSupport == null) { | ||
| 776 | return new PropertyChangeListener[0]; | ||
| 777 | } | ||
| 778 | return changeSupport.getPropertyChangeListeners(propertyName); | ||
| 779 | } | ||
| 780 | } | ||
| 781 | |||
| 782 | final class MostRecentKeyValue { | ||
| 783 | Object key; | ||
| 784 | Object value; | ||
| 785 | MostRecentKeyValue(Object k, Object v) { | ||
| 786 | key = k; | ||
| 787 | value = v; | ||
| 788 | } | ||
| 789 | void setPair(Object k, Object v) { | ||
| 790 | key = k; | ||
| 791 | value = v; | ||
| 792 | } | ||
| 793 | } | ||