author | alanb |
Thu, 08 Feb 2018 10:55:21 +0000 | |
changeset 48761 | 74c1fa26435a |
parent 47216 | 71c04702a3d5 |
child 49430 | e376090dc07e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2017, 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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package sun.nio.ch; |
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import java.nio.channels.Channel; |
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import java.nio.channels.AsynchronousChannelGroup; |
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import java.nio.channels.spi.AsynchronousChannelProvider; |
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import java.io.IOException; |
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import java.io.FileDescriptor; |
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import java.util.Queue; |
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import java.util.concurrent.*; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.security.PrivilegedAction; |
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import java.security.AccessController; |
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import java.security.AccessControlContext; |
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import sun.security.action.GetIntegerAction; |
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/** |
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* Base implementation of AsynchronousChannelGroup |
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*/ |
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abstract class AsynchronousChannelGroupImpl |
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extends AsynchronousChannelGroup implements Executor |
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{ |
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// number of internal threads handling I/O events when using an unbounded |
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// thread pool. Internal threads do not dispatch to completion handlers. |
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private static final int internalThreadCount = AccessController.doPrivileged( |
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new GetIntegerAction("sun.nio.ch.internalThreadPoolSize", 1)); |
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// associated thread pool |
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private final ThreadPool pool; |
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// number of tasks running (including internal) |
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private final AtomicInteger threadCount = new AtomicInteger(); |
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// associated Executor for timeouts |
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private ScheduledThreadPoolExecutor timeoutExecutor; |
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// task queue for when using a fixed thread pool. In that case, thread |
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// waiting on I/O events must be awokon to poll tasks from this queue. |
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private final Queue<Runnable> taskQueue; |
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// group shutdown |
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private final AtomicBoolean shutdown = new AtomicBoolean(); |
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private final Object shutdownNowLock = new Object(); |
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private volatile boolean terminateInitiated; |
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AsynchronousChannelGroupImpl(AsynchronousChannelProvider provider, |
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ThreadPool pool) |
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{ |
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super(provider); |
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this.pool = pool; |
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if (pool.isFixedThreadPool()) { |
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taskQueue = new ConcurrentLinkedQueue<>(); |
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} else { |
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taskQueue = null; // not used |
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} |
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// use default thread factory as thread should not be visible to |
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// application (it doesn't execute completion handlers). |
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this.timeoutExecutor = (ScheduledThreadPoolExecutor) |
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Executors.newScheduledThreadPool(1, ThreadPool.defaultThreadFactory()); |
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this.timeoutExecutor.setRemoveOnCancelPolicy(true); |
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} |
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final ExecutorService executor() { |
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return pool.executor(); |
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} |
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final boolean isFixedThreadPool() { |
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return pool.isFixedThreadPool(); |
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} |
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final int fixedThreadCount() { |
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if (isFixedThreadPool()) { |
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return pool.poolSize(); |
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} else { |
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return pool.poolSize() + internalThreadCount; |
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} |
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} |
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private Runnable bindToGroup(final Runnable task) { |
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final AsynchronousChannelGroupImpl thisGroup = this; |
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return new Runnable() { |
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public void run() { |
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Invoker.bindToGroup(thisGroup); |
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task.run(); |
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} |
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}; |
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} |
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private void startInternalThread(final Runnable task) { |
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AccessController.doPrivileged(new PrivilegedAction<>() { |
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@Override |
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|
120 |
public Void run() { |
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|
121 |
// internal threads should not be visible to application so |
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122 |
// cannot use user-supplied thread factory |
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123 |
ThreadPool.defaultThreadFactory().newThread(task).start(); |
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124 |
return null; |
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|
125 |
} |
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|
126 |
}); |
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127 |
} |
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|
128 |
|
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|
129 |
protected final void startThreads(Runnable task) { |
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130 |
if (!isFixedThreadPool()) { |
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|
131 |
for (int i=0; i<internalThreadCount; i++) { |
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132 |
startInternalThread(task); |
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133 |
threadCount.incrementAndGet(); |
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|
134 |
} |
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|
135 |
} |
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|
136 |
if (pool.poolSize() > 0) { |
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|
137 |
task = bindToGroup(task); |
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|
138 |
try { |
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|
139 |
for (int i=0; i<pool.poolSize(); i++) { |
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|
140 |
pool.executor().execute(task); |
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|
141 |
threadCount.incrementAndGet(); |
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|
142 |
} |
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|
143 |
} catch (RejectedExecutionException x) { |
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|
144 |
// nothing we can do |
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|
145 |
} |
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|
146 |
} |
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|
147 |
} |
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|
148 |
|
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|
149 |
final int threadCount() { |
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|
150 |
return threadCount.get(); |
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|
151 |
} |
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|
152 |
|
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|
153 |
/** |
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|
154 |
* Invoked by tasks as they terminate |
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|
155 |
*/ |
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|
156 |
final int threadExit(Runnable task, boolean replaceMe) { |
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|
157 |
if (replaceMe) { |
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|
158 |
try { |
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|
159 |
if (Invoker.isBoundToAnyGroup()) { |
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|
160 |
// submit new task to replace this thread |
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|
161 |
pool.executor().execute(bindToGroup(task)); |
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|
162 |
} else { |
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|
163 |
// replace internal thread |
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|
164 |
startInternalThread(task); |
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|
165 |
} |
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|
166 |
return threadCount.get(); |
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|
167 |
} catch (RejectedExecutionException x) { |
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|
168 |
// unable to replace |
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|
169 |
} |
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|
170 |
} |
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|
171 |
return threadCount.decrementAndGet(); |
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|
172 |
} |
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|
173 |
|
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|
174 |
/** |
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parents:
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changeset
|
175 |
* Wakes up a thread waiting for I/O events to execute the given task. |
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parents:
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|
176 |
*/ |
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|
177 |
abstract void executeOnHandlerTask(Runnable task); |
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|
178 |
|
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parents:
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|
179 |
/** |
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|
180 |
* For a fixed thread pool the task is queued to a thread waiting on I/O |
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|
181 |
* events. For other thread pools we simply submit the task to the thread |
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|
182 |
* pool. |
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parents:
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|
183 |
*/ |
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parents:
diff
changeset
|
184 |
final void executeOnPooledThread(Runnable task) { |
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changeset
|
185 |
if (isFixedThreadPool()) { |
3acf8e5e2ca0
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parents:
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changeset
|
186 |
executeOnHandlerTask(task); |
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parents:
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changeset
|
187 |
} else { |
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changeset
|
188 |
pool.executor().execute(bindToGroup(task)); |
3acf8e5e2ca0
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parents:
diff
changeset
|
189 |
} |
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parents:
diff
changeset
|
190 |
} |
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parents:
diff
changeset
|
191 |
|
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parents:
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changeset
|
192 |
final void offerTask(Runnable task) { |
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|
193 |
taskQueue.offer(task); |
3acf8e5e2ca0
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parents:
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changeset
|
194 |
} |
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parents:
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changeset
|
195 |
|
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parents:
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changeset
|
196 |
final Runnable pollTask() { |
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|
197 |
return (taskQueue == null) ? null : taskQueue.poll(); |
3acf8e5e2ca0
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parents:
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changeset
|
198 |
} |
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parents:
diff
changeset
|
199 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
200 |
final Future<?> schedule(Runnable task, long timeout, TimeUnit unit) { |
3acf8e5e2ca0
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parents:
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changeset
|
201 |
try { |
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changeset
|
202 |
return timeoutExecutor.schedule(task, timeout, unit); |
3acf8e5e2ca0
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parents:
diff
changeset
|
203 |
} catch (RejectedExecutionException rej) { |
3acf8e5e2ca0
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parents:
diff
changeset
|
204 |
if (terminateInitiated) { |
3acf8e5e2ca0
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parents:
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changeset
|
205 |
// no timeout scheduled as group is terminating |
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|
206 |
return null; |
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parents:
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changeset
|
207 |
} |
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changeset
|
208 |
throw new AssertionError(rej); |
3acf8e5e2ca0
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parents:
diff
changeset
|
209 |
} |
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parents:
diff
changeset
|
210 |
} |
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parents:
diff
changeset
|
211 |
|
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|
212 |
@Override |
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|
213 |
public final boolean isShutdown() { |
3632
399359a027de
6842687: New I/O: Update Asynchronous I/O API to jsr203/nio2-b101
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2057
diff
changeset
|
214 |
return shutdown.get(); |
2057
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parents:
diff
changeset
|
215 |
} |
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changeset
|
216 |
|
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|
217 |
@Override |
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|
218 |
public final boolean isTerminated() { |
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|
219 |
return pool.executor().isTerminated(); |
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parents:
diff
changeset
|
220 |
} |
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parents:
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changeset
|
221 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
222 |
/** |
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changeset
|
223 |
* Returns true if there are no channels in the group |
3acf8e5e2ca0
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parents:
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|
224 |
*/ |
3acf8e5e2ca0
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|
225 |
abstract boolean isEmpty(); |
3acf8e5e2ca0
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parents:
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changeset
|
226 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
227 |
/** |
3acf8e5e2ca0
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parents:
diff
changeset
|
228 |
* Attaches a foreign channel to this group. |
3acf8e5e2ca0
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parents:
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|
229 |
*/ |
3acf8e5e2ca0
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changeset
|
230 |
abstract Object attachForeignChannel(Channel channel, FileDescriptor fdo) |
3acf8e5e2ca0
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|
231 |
throws IOException; |
3acf8e5e2ca0
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|
232 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
233 |
/** |
3acf8e5e2ca0
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parents:
diff
changeset
|
234 |
* Detaches a foreign channel from this group. |
3acf8e5e2ca0
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parents:
diff
changeset
|
235 |
*/ |
3acf8e5e2ca0
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diff
changeset
|
236 |
abstract void detachForeignChannel(Object key); |
3acf8e5e2ca0
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changeset
|
237 |
|
3acf8e5e2ca0
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changeset
|
238 |
/** |
3acf8e5e2ca0
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* Closes all channels in the group |
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*/ |
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abstract void closeAllChannels() throws IOException; |
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|
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/** |
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* Shutdown all tasks waiting for I/O events. |
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*/ |
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abstract void shutdownHandlerTasks(); |
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|
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private void shutdownExecutors() { |
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AccessController.doPrivileged( |
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new PrivilegedAction<>() { |
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public Void run() { |
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pool.executor().shutdown(); |
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timeoutExecutor.shutdown(); |
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return null; |
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} |
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}, |
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null, |
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new RuntimePermission("modifyThread")); |
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} |
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|
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@Override |
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public final void shutdown() { |
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if (shutdown.getAndSet(true)) { |
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// already shutdown |
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return; |
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} |
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// if there are channels in the group then shutdown will continue |
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// when the last channel is closed |
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if (!isEmpty()) { |
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return; |
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} |
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// initiate termination (acquire shutdownNowLock to ensure that other |
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// threads invoking shutdownNow will block). |
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synchronized (shutdownNowLock) { |
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if (!terminateInitiated) { |
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terminateInitiated = true; |
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shutdownHandlerTasks(); |
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shutdownExecutors(); |
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} |
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} |
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} |
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|
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@Override |
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public final void shutdownNow() throws IOException { |
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shutdown.set(true); |
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synchronized (shutdownNowLock) { |
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if (!terminateInitiated) { |
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terminateInitiated = true; |
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closeAllChannels(); |
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shutdownHandlerTasks(); |
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shutdownExecutors(); |
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} |
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} |
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} |
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/** |
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* For use by AsynchronousFileChannel to release resources without shutting |
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* down the thread pool. |
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*/ |
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final void detachFromThreadPool() { |
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if (shutdown.getAndSet(true)) |
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throw new AssertionError("Already shutdown"); |
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if (!isEmpty()) |
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throw new AssertionError("Group not empty"); |
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shutdownHandlerTasks(); |
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} |
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@Override |
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public final boolean awaitTermination(long timeout, TimeUnit unit) |
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throws InterruptedException |
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{ |
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return pool.executor().awaitTermination(timeout, unit); |
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} |
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|
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/** |
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* Executes the given command on one of the channel group's pooled threads. |
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*/ |
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@Override |
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public final void execute(Runnable task) { |
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SecurityManager sm = System.getSecurityManager(); |
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if (sm != null) { |
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// when a security manager is installed then the user's task |
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// must be run with the current calling context |
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final AccessControlContext acc = AccessController.getContext(); |
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final Runnable delegate = task; |
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task = new Runnable() { |
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@Override |
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public void run() { |
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AccessController.doPrivileged(new PrivilegedAction<>() { |
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@Override |
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public Void run() { |
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delegate.run(); |
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return null; |
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} |
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}, acc); |
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} |
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}; |
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} |
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executeOnPooledThread(task); |
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} |
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} |