author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 5506 | 202f599c92aa |
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.util.concurrent.*; |
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import java.security.AccessController; |
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import sun.security.action.GetPropertyAction; |
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import sun.security.action.GetIntegerAction; |
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|
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/** |
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* Encapsulates a thread pool associated with a channel group. |
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*/ |
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|
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public class ThreadPool { |
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private static final String DEFAULT_THREAD_POOL_THREAD_FACTORY = |
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"java.nio.channels.DefaultThreadPool.threadFactory"; |
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private static final String DEFAULT_THREAD_POOL_INITIAL_SIZE = |
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"java.nio.channels.DefaultThreadPool.initialSize"; |
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private static final ThreadFactory defaultThreadFactory = new ThreadFactory() { |
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@Override |
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public Thread newThread(Runnable r) { |
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Thread t = new Thread(r); |
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t.setDaemon(true); |
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return t; |
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} |
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}; |
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|
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private final ExecutorService executor; |
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|
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// indicates if thread pool is fixed size |
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private final boolean isFixed; |
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|
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// indicates the pool size (for a fixed thread pool configuratin this is |
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// the maximum pool size; for other thread pools it is the initial size) |
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private final int poolSize; |
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private ThreadPool(ExecutorService executor, |
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boolean isFixed, |
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int poolSize) |
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{ |
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this.executor = executor; |
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this.isFixed = isFixed; |
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this.poolSize = poolSize; |
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} |
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ExecutorService executor() { |
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return executor; |
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} |
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boolean isFixedThreadPool() { |
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return isFixed; |
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} |
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int poolSize() { |
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return poolSize; |
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} |
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static ThreadFactory defaultThreadFactory() { |
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return defaultThreadFactory; |
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} |
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private static class DefaultThreadPoolHolder { |
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final static ThreadPool defaultThreadPool = createDefault(); |
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} |
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// return the default (system-wide) thread pool |
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static ThreadPool getDefault() { |
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return DefaultThreadPoolHolder.defaultThreadPool; |
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} |
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// create thread using default settings (configured by system properties) |
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static ThreadPool createDefault() { |
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// default the number of fixed threads to the hardware core count |
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int initialSize = getDefaultThreadPoolInitialSize(); |
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if (initialSize < 0) |
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initialSize = Runtime.getRuntime().availableProcessors(); |
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// default to thread factory that creates daemon threads |
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ThreadFactory threadFactory = getDefaultThreadPoolThreadFactory(); |
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if (threadFactory == null) |
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threadFactory = defaultThreadFactory; |
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// create thread pool |
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ExecutorService executor = |
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new ThreadPoolExecutor(0, Integer.MAX_VALUE, |
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Long.MAX_VALUE, TimeUnit.MILLISECONDS, |
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new SynchronousQueue<Runnable>(), |
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threadFactory); |
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return new ThreadPool(executor, false, initialSize); |
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} |
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// create using given parameters |
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static ThreadPool create(int nThreads, ThreadFactory factory) { |
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if (nThreads <= 0) |
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throw new IllegalArgumentException("'nThreads' must be > 0"); |
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ExecutorService executor = Executors.newFixedThreadPool(nThreads, factory); |
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return new ThreadPool(executor, true, nThreads); |
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119 |
} |
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120 |
|
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121 |
// wrap a user-supplied executor |
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122 |
public static ThreadPool wrap(ExecutorService executor, int initialSize) { |
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123 |
if (executor == null) |
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124 |
throw new NullPointerException("'executor' is null"); |
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125 |
// attempt to check if cached thread pool |
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126 |
if (executor instanceof ThreadPoolExecutor) { |
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int max = ((ThreadPoolExecutor)executor).getMaximumPoolSize(); |
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128 |
if (max == Integer.MAX_VALUE) { |
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129 |
if (initialSize < 0) { |
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initialSize = Runtime.getRuntime().availableProcessors(); |
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131 |
} else { |
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132 |
// not a cached thread pool so ignore initial size |
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133 |
initialSize = 0; |
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134 |
} |
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135 |
} |
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136 |
} else { |
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// some other type of thread pool |
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138 |
if (initialSize < 0) |
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initialSize = 0; |
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140 |
} |
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return new ThreadPool(executor, false, initialSize); |
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142 |
} |
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143 |
|
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144 |
private static int getDefaultThreadPoolInitialSize() { |
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145 |
String propValue = AccessController.doPrivileged(new |
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146 |
GetPropertyAction(DEFAULT_THREAD_POOL_INITIAL_SIZE)); |
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147 |
if (propValue != null) { |
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148 |
try { |
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149 |
return Integer.parseInt(propValue); |
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150 |
} catch (NumberFormatException x) { |
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151 |
throw new Error("Value of property '" + DEFAULT_THREAD_POOL_INITIAL_SIZE + |
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152 |
"' is invalid: " + x); |
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153 |
} |
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154 |
} |
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155 |
return -1; |
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156 |
} |
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157 |
|
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158 |
private static ThreadFactory getDefaultThreadPoolThreadFactory() { |
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159 |
String propValue = AccessController.doPrivileged(new |
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160 |
GetPropertyAction(DEFAULT_THREAD_POOL_THREAD_FACTORY)); |
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161 |
if (propValue != null) { |
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162 |
try { |
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163 |
Class<?> c = Class |
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164 |
.forName(propValue, true, ClassLoader.getSystemClassLoader()); |
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165 |
return ((ThreadFactory)c.newInstance()); |
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166 |
} catch (ClassNotFoundException x) { |
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167 |
throw new Error(x); |
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168 |
} catch (InstantiationException x) { |
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169 |
throw new Error(x); |
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170 |
} catch (IllegalAccessException x) { |
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171 |
throw new Error(x); |
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|
172 |
} |
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|
173 |
} |
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174 |
return null; |
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175 |
} |
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176 |
} |