author | psadhukhan |
Tue, 26 Sep 2017 10:46:23 +0530 | |
changeset 47374 | bf712ea57bb0 |
parent 47216 | 71c04702a3d5 |
child 49299 | 719064f540f3 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
|
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
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package java.awt; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.LinkedList; |
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import sun.awt.AWTAccessor; |
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import sun.awt.AppContext; |
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import sun.awt.SunToolkit; |
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/** |
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* A mechanism for ensuring that a series of AWTEvents are executed in a |
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* precise order, even across multiple AppContexts. The nested events will be |
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* dispatched in the order in which their wrapping SequencedEvents were |
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* constructed. The only exception to this rule is if the peer of the target of |
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* the nested event was destroyed (with a call to Component.removeNotify) |
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* before the wrapping SequencedEvent was able to be dispatched. In this case, |
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* the nested event is never dispatched. |
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* |
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* @author David Mendenhall |
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*/ |
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class SequencedEvent extends AWTEvent implements ActiveEvent { |
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/* |
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* serialVersionUID |
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*/ |
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private static final long serialVersionUID = 547742659238625067L; |
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private static final int ID = |
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java.awt.event.FocusEvent.FOCUS_LAST + 1; |
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private static final LinkedList<SequencedEvent> list = new LinkedList<>(); |
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private final AWTEvent nested; |
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private AppContext appContext; |
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private boolean disposed; |
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private static boolean fxAppThreadIsDispatchThread; |
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private Thread fxCheckSequenceThread; |
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static { |
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AWTAccessor.setSequencedEventAccessor(new AWTAccessor.SequencedEventAccessor() { |
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public AWTEvent getNested(AWTEvent sequencedEvent) { |
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return ((SequencedEvent)sequencedEvent).nested; |
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} |
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public boolean isSequencedEvent(AWTEvent event) { |
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return event instanceof SequencedEvent; |
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} |
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public AWTEvent create(AWTEvent event) { |
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return new SequencedEvent(event); |
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} |
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}); |
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AccessController.doPrivileged(new PrivilegedAction<Object>() { |
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public Object run() { |
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fxAppThreadIsDispatchThread = |
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"true".equals(System.getProperty("javafx.embed.singleThread")); |
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return null; |
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} |
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}); |
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} |
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/** |
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* Constructs a new SequencedEvent which will dispatch the specified |
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* nested event. |
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* |
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* @param nested the AWTEvent which this SequencedEvent's dispatch() |
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* method will dispatch |
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*/ |
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public SequencedEvent(AWTEvent nested) { |
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super(nested.getSource(), ID); |
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this.nested = nested; |
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// All AWTEvents that are wrapped in SequencedEvents are (at |
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// least currently) implicitly generated by the system |
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SunToolkit.setSystemGenerated(nested); |
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97 |
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if (fxAppThreadIsDispatchThread) { |
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fxCheckSequenceThread = new Thread() { |
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@Override |
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public void run() { |
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while(!isFirstOrDisposed()) { |
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try { |
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Thread.sleep(100); |
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} catch (InterruptedException e) { |
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break; |
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} |
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} |
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} |
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}; |
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} |
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synchronized (SequencedEvent.class) { |
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list.add(this); |
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} |
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} |
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/** |
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* Dispatches the nested event after all previous nested events have been |
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* dispatched or disposed. If this method is invoked before all previous nested events |
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* have been dispatched, then this method blocks until such a point is |
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* reached. |
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* While waiting disposes nested events to disposed AppContext |
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* |
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* NOTE: Locking protocol. Since dispose() can get EventQueue lock, |
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* dispatch() shall never call dispose() while holding the lock on the list, |
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* as EventQueue lock is held during dispatching. The locks should be acquired |
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* in the same order. |
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*/ |
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public final void dispatch() { |
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try { |
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appContext = AppContext.getAppContext(); |
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||
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if (getFirst() != this) { |
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if (EventQueue.isDispatchThread()) { |
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if (Thread.currentThread() instanceof EventDispatchThread) { |
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EventDispatchThread edt = (EventDispatchThread) |
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Thread.currentThread(); |
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edt.pumpEvents(SentEvent.ID, new Conditional() { |
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public boolean evaluate() { |
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return !SequencedEvent.this.isFirstOrDisposed(); |
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} |
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}); |
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} else { |
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if (fxAppThreadIsDispatchThread) { |
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fxCheckSequenceThread.start(); |
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try { |
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// check if event is dispatched or disposed |
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// but since this user app thread is same as |
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// dispatch thread in fx when run with |
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// javafx.embed.singleThread=true |
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// we do not wait infinitely to avoid deadlock |
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// as dispatch will ultimately be done by this thread |
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fxCheckSequenceThread.join(500); |
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} catch (InterruptedException e) { |
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} |
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} |
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} |
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} else { |
159 |
while(!isFirstOrDisposed()) { |
|
160 |
synchronized (SequencedEvent.class) { |
|
161 |
try { |
|
162 |
SequencedEvent.class.wait(1000); |
|
163 |
} catch (InterruptedException e) { |
|
164 |
break; |
|
165 |
} |
|
166 |
} |
|
167 |
} |
|
168 |
} |
|
169 |
} |
|
170 |
||
171 |
if (!disposed) { |
|
172 |
KeyboardFocusManager.getCurrentKeyboardFocusManager(). |
|
173 |
setCurrentSequencedEvent(this); |
|
174 |
Toolkit.getEventQueue().dispatchEvent(nested); |
|
175 |
} |
|
176 |
} finally { |
|
177 |
dispose(); |
|
178 |
} |
|
179 |
} |
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180 |
||
181 |
/** |
|
182 |
* true only if event exists and nested source appContext is disposed. |
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183 |
*/ |
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private static final boolean isOwnerAppContextDisposed(SequencedEvent se) { |
2 | 185 |
if (se != null) { |
186 |
Object target = se.nested.getSource(); |
|
187 |
if (target instanceof Component) { |
|
188 |
return ((Component)target).appContext.isDisposed(); |
|
189 |
} |
|
190 |
} |
|
191 |
return false; |
|
192 |
} |
|
193 |
||
194 |
/** |
|
195 |
* Sequenced events are dispatched in order, so we cannot dispatch |
|
196 |
* until we are the first sequenced event in the queue (i.e. it's our |
|
197 |
* turn). But while we wait for our turn to dispatch, the event |
|
198 |
* could have been disposed for a number of reasons. |
|
199 |
*/ |
|
200 |
public final boolean isFirstOrDisposed() { |
|
201 |
if (disposed) { |
|
202 |
return true; |
|
203 |
} |
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204 |
// getFirstWithContext can dispose this |
|
205 |
return this == getFirstWithContext() || disposed; |
|
206 |
} |
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private static final synchronized SequencedEvent getFirst() { |
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return list.getFirst(); |
2 | 210 |
} |
211 |
||
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/* Disposes all events from disposed AppContext |
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213 |
* return first valid event |
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*/ |
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private static final SequencedEvent getFirstWithContext() { |
2 | 216 |
SequencedEvent first = getFirst(); |
217 |
while(isOwnerAppContextDisposed(first)) { |
|
218 |
first.dispose(); |
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219 |
first = getFirst(); |
|
220 |
} |
|
221 |
return first; |
|
222 |
} |
|
223 |
||
224 |
/** |
|
225 |
* Disposes of this instance. This method is invoked once the nested event |
|
226 |
* has been dispatched and handled, or when the peer of the target of the |
|
227 |
* nested event has been disposed with a call to Component.removeNotify. |
|
228 |
* |
|
229 |
* NOTE: Locking protocol. Since SunToolkit.postEvent can get EventQueue lock, |
|
230 |
* it shall never be called while holding the lock on the list, |
|
231 |
* as EventQueue lock is held during dispatching and dispatch() will get |
|
232 |
* lock on the list. The locks should be acquired in the same order. |
|
233 |
*/ |
|
234 |
final void dispose() { |
|
235 |
synchronized (SequencedEvent.class) { |
|
236 |
if (disposed) { |
|
237 |
return; |
|
238 |
} |
|
239 |
if (KeyboardFocusManager.getCurrentKeyboardFocusManager(). |
|
240 |
getCurrentSequencedEvent() == this) { |
|
241 |
KeyboardFocusManager.getCurrentKeyboardFocusManager(). |
|
242 |
setCurrentSequencedEvent(null); |
|
243 |
} |
|
244 |
disposed = true; |
|
245 |
} |
|
246 |
// Wake myself up |
|
247 |
if (appContext != null) { |
|
248 |
SunToolkit.postEvent(appContext, new SentEvent()); |
|
249 |
} |
|
250 |
||
251 |
SequencedEvent next = null; |
|
252 |
||
253 |
synchronized (SequencedEvent.class) { |
|
254 |
SequencedEvent.class.notifyAll(); |
|
255 |
||
256 |
if (list.getFirst() == this) { |
|
257 |
list.removeFirst(); |
|
258 |
||
259 |
if (!list.isEmpty()) { |
|
22584
eed64ee05369
8032733: Fix cast lint warnings in client libraries
darcy
parents:
20107
diff
changeset
|
260 |
next = list.getFirst(); |
2 | 261 |
} |
262 |
} else { |
|
263 |
list.remove(this); |
|
264 |
} |
|
265 |
} |
|
266 |
// Wake up waiting threads |
|
267 |
if (next != null && next.appContext != null) { |
|
268 |
SunToolkit.postEvent(next.appContext, new SentEvent()); |
|
269 |
} |
|
270 |
} |
|
271 |
} |