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,
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 };
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) {
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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 Map<Object, Object> 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<Void>() {
202 public Void 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 null;
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,
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<Void>() {
403 public Void 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 };
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<Thread> {
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 Thread 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<Thread> action = new CreateThreadAction(appContext, r);
556 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) {
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