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 java.awt;
27
28 import java.util.LinkedList;
29 import sun.awt.AWTAccessor;
30 import sun.awt.AppContext;
31 import sun.awt.SunToolkit;
32
33 /**
34 * A mechanism for ensuring that a series of AWTEvents are executed in a
35 * precise order, even across multiple AppContexts. The nested events will be
36 * dispatched in the order in which their wrapping SequencedEvents were
37 * constructed. The only exception to this rule is if the peer of the target of
38 * the nested event was destroyed (with a call to Component.removeNotify)
39 * before the wrapping SequencedEvent was able to be dispatched. In this case,
40 * the nested event is never dispatched.
41 *
42 * @author David Mendenhall
43 */
44 class SequencedEvent extends AWTEvent implements ActiveEvent {
45 /*
46 * serialVersionUID
47 */
48 private static final long serialVersionUID = 547742659238625067L;
49
50 private static final int ID =
51 java.awt.event.FocusEvent.FOCUS_LAST + 1;
52 private static final LinkedList<SequencedEvent> list = new LinkedList<>();
53
54 private final AWTEvent nested;
55 private AppContext appContext;
56 private boolean disposed;
57
58 static {
59 AWTAccessor.setSequencedEventAccessor(new AWTAccessor.SequencedEventAccessor() {
60 public AWTEvent getNested(AWTEvent sequencedEvent) {
61 return ((SequencedEvent)sequencedEvent).nested;
62 }
63 public boolean isSequencedEvent(AWTEvent event) {
64 return event instanceof SequencedEvent;
65 }
66
67 public AWTEvent create(AWTEvent event) {
68 return new SequencedEvent(event);
69 }
70 });
71 }
72
73 /**
74 * Constructs a new SequencedEvent which will dispatch the specified
75 * nested event.
76 *
77 * @param nested the AWTEvent which this SequencedEvent's dispatch()
78 * method will dispatch
79 */
80 public SequencedEvent(AWTEvent nested) {
81 super(nested.getSource(), ID);
82 this.nested = nested;
83 // All AWTEvents that are wrapped in SequencedEvents are (at
84 // least currently) implicitly generated by the system
85 SunToolkit.setSystemGenerated(nested);
86 synchronized (SequencedEvent.class) {
87 list.add(this);
88 }
89 }
90
91 /**
92 * Dispatches the nested event after all previous nested events have been
93 * dispatched or disposed. If this method is invoked before all previous nested events
94 * have been dispatched, then this method blocks until such a point is
95 * reached.
96 * While waiting disposes nested events to disposed AppContext
97 *
98 * NOTE: Locking protocol. Since dispose() can get EventQueue lock,
99 * dispatch() shall never call dispose() while holding the lock on the list,
100 * as EventQueue lock is held during dispatching. The locks should be acquired
101 * in the same order.
102 */
103 public final void dispatch() {
104 try {
105 appContext = AppContext.getAppContext();
106
107 if (getFirst() != this) {
108 if (EventQueue.isDispatchThread()) {
109 EventDispatchThread edt = (EventDispatchThread)
110 Thread.currentThread();
111 edt.pumpEvents(SentEvent.ID, new Conditional() {
112 public boolean evaluate() {
113 return !SequencedEvent.this.isFirstOrDisposed();
114 }
115 });
116 } else {
117 while(!isFirstOrDisposed()) {
118 synchronized (SequencedEvent.class) {
119 try {
120 SequencedEvent.class.wait(1000);
121 } catch (InterruptedException e) {
122 break;
123 }
124 }
125 }
126 }
127 }
128
129 if (!disposed) {
130 KeyboardFocusManager.getCurrentKeyboardFocusManager().
131 setCurrentSequencedEvent(this);
132 Toolkit.getEventQueue().dispatchEvent(nested);
133 }
134 } finally {
135 dispose();
|
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 java.awt;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import java.util.LinkedList;
31 import sun.awt.AWTAccessor;
32 import sun.awt.AppContext;
33 import sun.awt.SunToolkit;
34
35 /**
36 * A mechanism for ensuring that a series of AWTEvents are executed in a
37 * precise order, even across multiple AppContexts. The nested events will be
38 * dispatched in the order in which their wrapping SequencedEvents were
39 * constructed. The only exception to this rule is if the peer of the target of
40 * the nested event was destroyed (with a call to Component.removeNotify)
41 * before the wrapping SequencedEvent was able to be dispatched. In this case,
42 * the nested event is never dispatched.
43 *
44 * @author David Mendenhall
45 */
46 class SequencedEvent extends AWTEvent implements ActiveEvent {
47 /*
48 * serialVersionUID
49 */
50 private static final long serialVersionUID = 547742659238625067L;
51
52 private static final int ID =
53 java.awt.event.FocusEvent.FOCUS_LAST + 1;
54 private static final LinkedList<SequencedEvent> list = new LinkedList<>();
55
56 private final AWTEvent nested;
57 private AppContext appContext;
58 private boolean disposed;
59
60 private static boolean fxAppThreadIsDispatchThread;
61 private Thread fxCheckSequenceThread;
62 static {
63 AWTAccessor.setSequencedEventAccessor(new AWTAccessor.SequencedEventAccessor() {
64 public AWTEvent getNested(AWTEvent sequencedEvent) {
65 return ((SequencedEvent)sequencedEvent).nested;
66 }
67 public boolean isSequencedEvent(AWTEvent event) {
68 return event instanceof SequencedEvent;
69 }
70
71 public AWTEvent create(AWTEvent event) {
72 return new SequencedEvent(event);
73 }
74 });
75 AccessController.doPrivileged(new PrivilegedAction<Object>() {
76 public Object run() {
77 fxAppThreadIsDispatchThread =
78 "true".equals(System.getProperty("javafx.embed.singleThread"));
79 return null;
80 }
81 });
82 }
83
84 /**
85 * Constructs a new SequencedEvent which will dispatch the specified
86 * nested event.
87 *
88 * @param nested the AWTEvent which this SequencedEvent's dispatch()
89 * method will dispatch
90 */
91 public SequencedEvent(AWTEvent nested) {
92 super(nested.getSource(), ID);
93 this.nested = nested;
94 // All AWTEvents that are wrapped in SequencedEvents are (at
95 // least currently) implicitly generated by the system
96 SunToolkit.setSystemGenerated(nested);
97
98 if (fxAppThreadIsDispatchThread) {
99 fxCheckSequenceThread = new Thread() {
100 @Override
101 public void run() {
102 while(!isFirstOrDisposed()) {
103 try {
104 Thread.sleep(100);
105 } catch (InterruptedException e) {
106 break;
107 }
108 }
109 }
110 };
111 }
112 synchronized (SequencedEvent.class) {
113 list.add(this);
114 }
115 }
116
117 /**
118 * Dispatches the nested event after all previous nested events have been
119 * dispatched or disposed. If this method is invoked before all previous nested events
120 * have been dispatched, then this method blocks until such a point is
121 * reached.
122 * While waiting disposes nested events to disposed AppContext
123 *
124 * NOTE: Locking protocol. Since dispose() can get EventQueue lock,
125 * dispatch() shall never call dispose() while holding the lock on the list,
126 * as EventQueue lock is held during dispatching. The locks should be acquired
127 * in the same order.
128 */
129 public final void dispatch() {
130 try {
131 appContext = AppContext.getAppContext();
132
133 if (getFirst() != this) {
134 if (EventQueue.isDispatchThread()) {
135 if (Thread.currentThread() instanceof EventDispatchThread) {
136 EventDispatchThread edt = (EventDispatchThread)
137 Thread.currentThread();
138 edt.pumpEvents(SentEvent.ID, new Conditional() {
139 public boolean evaluate() {
140 return !SequencedEvent.this.isFirstOrDisposed();
141 }
142 });
143 } else {
144 if (fxAppThreadIsDispatchThread) {
145 fxCheckSequenceThread.start();
146 try {
147 // check if event is dispatched or disposed
148 // but since this user app thread is same as
149 // dispatch thread in fx when run with
150 // javafx.embed.singleThread=true
151 // we do not wait infinitely to avoid deadlock
152 // as dispatch will ultimately be done by this thread
153 fxCheckSequenceThread.join(500);
154 } catch (InterruptedException e) {
155 }
156 }
157 }
158 } 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();
|