author | igerasim |
Tue, 28 Oct 2014 15:36:27 +0300 | |
changeset 27263 | 819f5f87d485 |
parent 25859 | 3317bb8137f4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2009, 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.spi.AsynchronousChannelProvider; |
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import java.nio.channels.*; |
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import java.io.IOException; |
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import java.io.Closeable; |
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import java.io.FileDescriptor; |
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import java.util.Map; |
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import java.util.HashMap; |
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import java.util.concurrent.locks.ReadWriteLock; |
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import java.util.concurrent.locks.ReentrantReadWriteLock; |
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/** |
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* Base implementation of AsynchronousChannelGroupImpl for Unix systems. |
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*/ |
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abstract class Port extends AsynchronousChannelGroupImpl { |
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/** |
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* Implemented by clients registered with this port. |
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*/ |
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interface PollableChannel extends Closeable { |
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void onEvent(int events, boolean mayInvokeDirect); |
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} |
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// maps fd to "pollable" channel |
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protected final ReadWriteLock fdToChannelLock = new ReentrantReadWriteLock(); |
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protected final Map<Integer,PollableChannel> fdToChannel = |
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new HashMap<Integer,PollableChannel>(); |
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Port(AsynchronousChannelProvider provider, ThreadPool pool) { |
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super(provider, pool); |
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} |
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/** |
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* Register channel identified by its file descriptor |
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*/ |
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final void register(int fd, PollableChannel ch) { |
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fdToChannelLock.writeLock().lock(); |
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try { |
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if (isShutdown()) |
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throw new ShutdownChannelGroupException(); |
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fdToChannel.put(Integer.valueOf(fd), ch); |
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} finally { |
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fdToChannelLock.writeLock().unlock(); |
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} |
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} |
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/** |
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* Callback method for implementations that need special handling when fd is |
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* removed (currently only needed in the AIX-Port - see AixPollPort.java). |
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*/ |
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protected void preUnregister(int fd) { |
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// Do nothing by default. |
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} |
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/** |
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* Unregister channel identified by its file descriptor |
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*/ |
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final void unregister(int fd) { |
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boolean checkForShutdown = false; |
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preUnregister(fd); |
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fdToChannelLock.writeLock().lock(); |
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try { |
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fdToChannel.remove(Integer.valueOf(fd)); |
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// last key to be removed so check if group is shutdown |
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if (fdToChannel.isEmpty()) |
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checkForShutdown = true; |
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} finally { |
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fdToChannelLock.writeLock().unlock(); |
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} |
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// continue shutdown |
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if (checkForShutdown && isShutdown()) { |
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try { |
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shutdownNow(); |
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} catch (IOException ignore) { } |
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} |
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} |
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/** |
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* Register file descriptor with polling mechanism for given events. |
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* The implementation should translate the events as required. |
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*/ |
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abstract void startPoll(int fd, int events); |
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@Override |
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final boolean isEmpty() { |
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fdToChannelLock.writeLock().lock(); |
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try { |
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return fdToChannel.isEmpty(); |
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} finally { |
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fdToChannelLock.writeLock().unlock(); |
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} |
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} |
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|
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@Override |
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final Object attachForeignChannel(final Channel channel, FileDescriptor fd) { |
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int fdVal = IOUtil.fdVal(fd); |
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register(fdVal, new PollableChannel() { |
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public void onEvent(int events, boolean mayInvokeDirect) { } |
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public void close() throws IOException { |
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channel.close(); |
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} |
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}); |
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return Integer.valueOf(fdVal); |
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} |
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|
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138 |
@Override |
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final void detachForeignChannel(Object key) { |
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unregister((Integer)key); |
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} |
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|
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143 |
@Override |
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final void closeAllChannels() { |
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/** |
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* Close channels in batches of up to 128 channels. This allows close |
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* to remove the channel from the map without interference. |
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*/ |
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final int MAX_BATCH_SIZE = 128; |
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PollableChannel channels[] = new PollableChannel[MAX_BATCH_SIZE]; |
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int count; |
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do { |
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// grab a batch of up to 128 channels |
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fdToChannelLock.writeLock().lock(); |
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count = 0; |
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156 |
try { |
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157 |
for (Integer fd: fdToChannel.keySet()) { |
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channels[count++] = fdToChannel.get(fd); |
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159 |
if (count >= MAX_BATCH_SIZE) |
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160 |
break; |
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161 |
} |
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162 |
} finally { |
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163 |
fdToChannelLock.writeLock().unlock(); |
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164 |
} |
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165 |
|
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166 |
// close them |
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167 |
for (int i=0; i<count; i++) { |
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168 |
try { |
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169 |
channels[i].close(); |
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} catch (IOException ignore) { } |
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171 |
} |
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172 |
} while (count > 0); |
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173 |
} |
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174 |
} |