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annotate src/org/eclipse/jetty/util/thread/ExecutorThreadPool.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -0600
parents 8e9db0bbf4f9
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.thread;
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20
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21 import java.util.concurrent.ArrayBlockingQueue;
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22 import java.util.concurrent.BlockingQueue;
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23 import java.util.concurrent.ExecutorService;
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24 import java.util.concurrent.LinkedBlockingQueue;
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25 import java.util.concurrent.RejectedExecutionException;
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26 import java.util.concurrent.SynchronousQueue;
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27 import java.util.concurrent.ThreadPoolExecutor;
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28 import java.util.concurrent.TimeUnit;
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29
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30 import org.eclipse.jetty.util.component.AbstractLifeCycle;
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31 import org.eclipse.jetty.util.component.LifeCycle;
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32 import org.slf4j.Logger;
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33 import org.slf4j.LoggerFactory;
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34
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35 /* ------------------------------------------------------------ */
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36 /**
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37 * Jetty ThreadPool using java 5 ThreadPoolExecutor
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38 * This class wraps a {@link ExecutorService} as a {@link ThreadPool} and
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39 * {@link LifeCycle} interfaces so that it may be used by the Jetty <code>org.eclipse.jetty.server.Server</code>
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40 */
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41 public class ExecutorThreadPool extends AbstractLifeCycle implements ThreadPool, LifeCycle
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42 {
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43 private static final Logger LOG = LoggerFactory.getLogger(ExecutorThreadPool.class);
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44 private final ExecutorService _executor;
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45
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46 /* ------------------------------------------------------------ */
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47 public ExecutorThreadPool(ExecutorService executor)
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48 {
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49 _executor = executor;
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50 }
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51
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52 /* ------------------------------------------------------------ */
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53 /**
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54 * Wraps an {@link ThreadPoolExecutor}.
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55 * Max pool size is 256, pool thread timeout after 60 seconds and
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56 * an unbounded {@link LinkedBlockingQueue} is used for the job queue;
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57 */
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58 public ExecutorThreadPool()
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59 {
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60 // Using an unbounded queue makes the maxThreads parameter useless
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61 // Refer to ThreadPoolExecutor javadocs for details
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62 this(new ThreadPoolExecutor(256, 256, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()));
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63 }
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64
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65 /* ------------------------------------------------------------ */
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66 /**
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67 * Wraps an {@link ThreadPoolExecutor}.
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68 * Max pool size is 256, pool thread timeout after 60 seconds, and core pool size is 32 when queueSize >= 0.
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69 * @param queueSize can be -1 for using an unbounded {@link LinkedBlockingQueue}, 0 for using a
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70 * {@link SynchronousQueue}, greater than 0 for using a {@link ArrayBlockingQueue} of the given size.
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71 */
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72 public ExecutorThreadPool(int queueSize)
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73 {
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74 this(queueSize < 0 ? new ThreadPoolExecutor(256, 256, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()) :
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75 queueSize == 0 ? new ThreadPoolExecutor(32, 256, 60, TimeUnit.SECONDS, new SynchronousQueue<Runnable>()) :
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76 new ThreadPoolExecutor(32, 256, 60, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(queueSize)));
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77 }
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78
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79 /* ------------------------------------------------------------ */
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80 /**
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81 * Wraps an {@link ThreadPoolExecutor} using
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82 * an unbounded {@link LinkedBlockingQueue} is used for the jobs queue;
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83 * @param corePoolSize must be equal to maximumPoolSize
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84 * @param maximumPoolSize the maximum number of threads to allow in the pool
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85 * @param keepAliveTime the max time a thread can remain idle, in milliseconds
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86 */
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87 public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime)
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88 {
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89 this(corePoolSize, maximumPoolSize, keepAliveTime, TimeUnit.MILLISECONDS);
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 /**
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94 * Wraps an {@link ThreadPoolExecutor} using
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95 * an unbounded {@link LinkedBlockingQueue} is used for the jobs queue.
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96 * @param corePoolSize must be equal to maximumPoolSize
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97 * @param maximumPoolSize the maximum number of threads to allow in the pool
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98 * @param keepAliveTime the max time a thread can remain idle
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99 * @param unit the unit for the keepAliveTime
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100 */
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101 public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit)
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102 {
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103 this(corePoolSize, maximumPoolSize, keepAliveTime, unit, new LinkedBlockingQueue<Runnable>());
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104 }
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105
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106 /* ------------------------------------------------------------ */
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107
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108 /**
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109 * Wraps an {@link ThreadPoolExecutor}
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110 * @param corePoolSize the number of threads to keep in the pool, even if they are idle
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111 * @param maximumPoolSize the maximum number of threads to allow in the pool
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112 * @param keepAliveTime the max time a thread can remain idle
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113 * @param unit the unit for the keepAliveTime
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114 * @param workQueue the queue to use for holding tasks before they are executed
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115 */
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116 public ExecutorThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue)
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117 {
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118 this(new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue));
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119 }
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120
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121 /* ------------------------------------------------------------ */
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122 public boolean dispatch(Runnable job)
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123 {
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124 try
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125 {
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126 _executor.execute(job);
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127 return true;
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128 }
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129 catch(RejectedExecutionException e)
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130 {
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131 LOG.warn("",e);
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132 return false;
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133 }
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134 }
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135
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136 /* ------------------------------------------------------------ */
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137 public int getIdleThreads()
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138 {
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139 if (_executor instanceof ThreadPoolExecutor)
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140 {
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141 final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
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142 return tpe.getPoolSize() - tpe.getActiveCount();
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143 }
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144 return -1;
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145 }
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146
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147 /* ------------------------------------------------------------ */
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148 public int getThreads()
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149 {
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150 if (_executor instanceof ThreadPoolExecutor)
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151 {
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152 final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
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153 return tpe.getPoolSize();
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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 /* ------------------------------------------------------------ */
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159 public boolean isLowOnThreads()
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160 {
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161 if (_executor instanceof ThreadPoolExecutor)
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162 {
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163 final ThreadPoolExecutor tpe = (ThreadPoolExecutor)_executor;
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164 // getActiveCount() locks the thread pool, so execute it last
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165 return tpe.getPoolSize() == tpe.getMaximumPoolSize() &&
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166 tpe.getQueue().size() >= tpe.getPoolSize() - tpe.getActiveCount();
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167 }
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168 return false;
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169 }
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170
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171 /* ------------------------------------------------------------ */
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172 public void join() throws InterruptedException
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173 {
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174 _executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
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175 }
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176
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177 /* ------------------------------------------------------------ */
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178 @Override
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179 protected void doStop() throws Exception
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180 {
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181 super.doStop();
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182 _executor.shutdownNow();
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183 }
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184 }