author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 3632 | 399359a027de |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.nio.ch; |
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|
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import java.nio.channels.*; |
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import java.util.concurrent.*; |
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import java.io.IOException; |
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/** |
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* A Future for a pending I/O operation. A PendingFuture allows for the |
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* attachment of an additional arbitrary context object and a timer task. |
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*/ |
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|
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final class PendingFuture<V,A> |
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extends AbstractFuture<V,A> |
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{ |
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private static final CancellationException CANCELLED = |
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new CancellationException(); |
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|
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private final CompletionHandler<V,? super A> handler; |
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// true if result (or exception) is available |
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private volatile boolean haveResult; |
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private volatile V result; |
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private volatile Throwable exc; |
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// latch for waiting (created lazily if needed) |
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private CountDownLatch latch; |
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// optional timer task that is cancelled when result becomes available |
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private Future<?> timeoutTask; |
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// optional context object |
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private volatile Object context; |
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PendingFuture(AsynchronousChannel channel, |
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CompletionHandler<V,? super A> handler, |
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A attachment, |
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Object context) |
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{ |
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super(channel, attachment); |
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this.handler = handler; |
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this.context = context; |
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} |
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PendingFuture(AsynchronousChannel channel, |
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CompletionHandler<V,? super A> handler, |
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A attachment) |
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{ |
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super(channel, attachment); |
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this.handler = handler; |
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} |
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CompletionHandler<V,? super A> handler() { |
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return handler; |
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} |
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void setContext(Object context) { |
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this.context = context; |
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} |
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Object getContext() { |
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return context; |
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} |
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void setTimeoutTask(Future<?> task) { |
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synchronized (this) { |
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if (haveResult) { |
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task.cancel(false); |
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} else { |
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this.timeoutTask = task; |
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} |
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} |
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} |
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// creates latch if required; return true if caller needs to wait |
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private boolean prepareForWait() { |
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synchronized (this) { |
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if (haveResult) { |
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return false; |
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} else { |
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if (latch == null) |
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latch = new CountDownLatch(1); |
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return true; |
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} |
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} |
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} |
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/** |
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* Sets the result, or a no-op if the result or exception is already set. |
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*/ |
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boolean setResult(V res) { |
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synchronized (this) { |
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|
118 |
if (haveResult) |
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119 |
return false; |
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120 |
result = res; |
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121 |
haveResult = true; |
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122 |
if (timeoutTask != null) |
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123 |
timeoutTask.cancel(false); |
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124 |
if (latch != null) |
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|
125 |
latch.countDown(); |
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|
126 |
return true; |
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|
127 |
} |
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|
128 |
} |
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129 |
|
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130 |
/** |
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131 |
* Sets the result, or a no-op if the result or exception is already set. |
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132 |
*/ |
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133 |
boolean setFailure(Throwable x) { |
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134 |
if (!(x instanceof IOException) && !(x instanceof SecurityException)) |
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|
135 |
x = new IOException(x); |
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|
136 |
synchronized (this) { |
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|
137 |
if (haveResult) |
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|
138 |
return false; |
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|
139 |
exc = x; |
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|
140 |
haveResult = true; |
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|
141 |
if (timeoutTask != null) |
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|
142 |
timeoutTask.cancel(false); |
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|
143 |
if (latch != null) |
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|
144 |
latch.countDown(); |
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|
145 |
return true; |
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|
146 |
} |
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|
147 |
} |
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|
148 |
|
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|
149 |
@Override |
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|
150 |
public V get() throws ExecutionException, InterruptedException { |
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|
151 |
if (!haveResult) { |
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|
152 |
boolean needToWait = prepareForWait(); |
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|
153 |
if (needToWait) |
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|
154 |
latch.await(); |
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|
155 |
} |
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|
156 |
if (exc != null) { |
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|
157 |
if (exc == CANCELLED) |
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|
158 |
throw new CancellationException(); |
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|
159 |
throw new ExecutionException(exc); |
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|
160 |
} |
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|
161 |
return result; |
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|
162 |
} |
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|
163 |
|
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|
164 |
@Override |
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|
165 |
public V get(long timeout, TimeUnit unit) |
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|
166 |
throws ExecutionException, InterruptedException, TimeoutException |
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|
167 |
{ |
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parents:
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changeset
|
168 |
if (!haveResult) { |
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|
169 |
boolean needToWait = prepareForWait(); |
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|
170 |
if (needToWait) |
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|
171 |
if (!latch.await(timeout, unit)) throw new TimeoutException(); |
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|
172 |
} |
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changeset
|
173 |
if (exc != null) { |
3acf8e5e2ca0
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changeset
|
174 |
if (exc == CANCELLED) |
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|
175 |
throw new CancellationException(); |
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|
176 |
throw new ExecutionException(exc); |
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|
177 |
} |
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|
178 |
return result; |
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parents:
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|
179 |
} |
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|
180 |
|
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|
181 |
@Override |
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|
182 |
Throwable exception() { |
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|
183 |
return (exc != CANCELLED) ? exc : null; |
3acf8e5e2ca0
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parents:
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changeset
|
184 |
} |
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parents:
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|
185 |
|
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|
186 |
@Override |
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|
187 |
V value() { |
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|
188 |
return result; |
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|
189 |
} |
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parents:
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changeset
|
190 |
|
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changeset
|
191 |
@Override |
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|
192 |
public boolean isCancelled() { |
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|
193 |
return (exc == CANCELLED); |
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parents:
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|
194 |
} |
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parents:
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|
195 |
|
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|
196 |
@Override |
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|
197 |
public boolean isDone() { |
3acf8e5e2ca0
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|
198 |
return haveResult; |
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|
199 |
} |
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parents:
diff
changeset
|
200 |
|
3acf8e5e2ca0
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parents:
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changeset
|
201 |
@Override |
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parents:
diff
changeset
|
202 |
public boolean cancel(boolean mayInterruptIfRunning) { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
203 |
synchronized (this) { |
3acf8e5e2ca0
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diff
changeset
|
204 |
if (haveResult) |
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changeset
|
205 |
return false; // already completed |
3acf8e5e2ca0
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parents:
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changeset
|
206 |
|
3acf8e5e2ca0
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parents:
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changeset
|
207 |
// A shutdown of the channel group will close all channels and |
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|
208 |
// shutdown the executor. To ensure that the completion handler |
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|
209 |
// is executed we queue the task while holding the lock. |
3acf8e5e2ca0
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changeset
|
210 |
if (handler != null) { |
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changeset
|
211 |
prepareForWait(); |
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|
212 |
Runnable cancelTask = new Runnable() { |
3acf8e5e2ca0
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|
213 |
public void run() { |
3acf8e5e2ca0
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changeset
|
214 |
while (!haveResult) { |
3acf8e5e2ca0
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|
215 |
try { |
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|
216 |
latch.await(); |
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|
217 |
} catch (InterruptedException ignore) { } |
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|
218 |
} |
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|
219 |
handler.cancelled(attachment()); |
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|
220 |
} |
3acf8e5e2ca0
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parents:
diff
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|
221 |
}; |
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|
222 |
AsynchronousChannel ch = channel(); |
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|
223 |
if (ch instanceof Groupable) { |
3acf8e5e2ca0
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|
224 |
((Groupable)ch).group().executeOnPooledThread(cancelTask); |
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|
225 |
} else { |
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|
226 |
if (ch instanceof AsynchronousFileChannelImpl) { |
3acf8e5e2ca0
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|
227 |
((AsynchronousFileChannelImpl)ch).executor().execute(cancelTask); |
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|
228 |
} else { |
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|
229 |
throw new AssertionError("Should not get here"); |
3acf8e5e2ca0
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parents:
diff
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|
230 |
} |
3acf8e5e2ca0
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parents:
diff
changeset
|
231 |
} |
3acf8e5e2ca0
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parents:
diff
changeset
|
232 |
} |
3acf8e5e2ca0
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|
233 |
|
3acf8e5e2ca0
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|
234 |
// notify channel |
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|
235 |
if (channel() instanceof Cancellable) |
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diff
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|
236 |
((Cancellable)channel()).onCancel(this); |
3acf8e5e2ca0
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// set result and cancel timer |
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exc = CANCELLED; |
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haveResult = true; |
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if (timeoutTask != null) |
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timeoutTask.cancel(false); |
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} |
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// close channel if forceful cancel |
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if (mayInterruptIfRunning) { |
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try { |
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channel().close(); |
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} catch (IOException ignore) { } |
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} |
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// release waiters (this also releases the invoker) |
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if (latch != null) |
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latch.countDown(); |
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return true; |
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} |
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} |