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annotate src/org/eclipse/jetty/util/thread/ShutdownThread.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.Arrays;
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22 import java.util.List;
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23 import java.util.concurrent.CopyOnWriteArrayList;
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24
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25 import org.eclipse.jetty.util.component.Destroyable;
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26 import org.eclipse.jetty.util.component.LifeCycle;
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27 import org.slf4j.Logger;
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28 import org.slf4j.LoggerFactory;
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29
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30
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31 /* ------------------------------------------------------------ */
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32 /**
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33 * ShutdownThread is a shutdown hook thread implemented as
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34 * singleton that maintains a list of lifecycle instances
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35 * that are registered with it and provides ability to stop
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36 * these lifecycles upon shutdown of the Java Virtual Machine
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37 */
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38 public class ShutdownThread extends Thread
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39 {
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40 private static final Logger LOG = LoggerFactory.getLogger(ShutdownThread.class);
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41 private static final ShutdownThread _thread = new ShutdownThread();
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42
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43 private boolean _hooked;
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44 private final List<LifeCycle> _lifeCycles = new CopyOnWriteArrayList<LifeCycle>();
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45
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46 /* ------------------------------------------------------------ */
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47 /**
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48 * Default constructor for the singleton
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49 *
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50 * Registers the instance as shutdown hook with the Java Runtime
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51 */
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52 private ShutdownThread()
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53 {
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54 }
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55
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56 /* ------------------------------------------------------------ */
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57 private synchronized void hook()
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58 {
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59 try
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60 {
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61 if (!_hooked)
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62 Runtime.getRuntime().addShutdownHook(this);
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63 _hooked=true;
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64 }
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65 catch(Exception e)
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66 {
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67 LOG.trace("",e);
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68 LOG.info("shutdown already commenced");
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69 }
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70 }
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71
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72 /* ------------------------------------------------------------ */
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73 private synchronized void unhook()
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74 {
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75 try
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76 {
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77 _hooked=false;
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78 Runtime.getRuntime().removeShutdownHook(this);
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79 }
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80 catch(Exception e)
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81 {
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82 LOG.trace("",e);
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83 LOG.debug("shutdown already commenced");
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84 }
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85 }
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86
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87 /* ------------------------------------------------------------ */
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88 /**
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89 * Returns the instance of the singleton
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90 *
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91 * @return the singleton instance of the {@link ShutdownThread}
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92 */
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93 public static ShutdownThread getInstance()
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94 {
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95 return _thread;
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96 }
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97
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98 /* ------------------------------------------------------------ */
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99 public static synchronized void register(LifeCycle... lifeCycles)
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100 {
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101 _thread._lifeCycles.addAll(Arrays.asList(lifeCycles));
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102 if (_thread._lifeCycles.size()>0)
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103 _thread.hook();
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104 }
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105
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106 /* ------------------------------------------------------------ */
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107 public static synchronized void register(int index, LifeCycle... lifeCycles)
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108 {
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109 _thread._lifeCycles.addAll(index,Arrays.asList(lifeCycles));
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110 if (_thread._lifeCycles.size()>0)
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111 _thread.hook();
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112 }
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113
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114 /* ------------------------------------------------------------ */
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115 public static synchronized void deregister(LifeCycle lifeCycle)
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116 {
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117 _thread._lifeCycles.remove(lifeCycle);
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118 if (_thread._lifeCycles.size()==0)
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119 _thread.unhook();
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120 }
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121
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122 /* ------------------------------------------------------------ */
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123 @Override
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124 public void run()
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125 {
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126 for (LifeCycle lifeCycle : _thread._lifeCycles)
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127 {
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128 try
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129 {
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130 if (lifeCycle.isStarted())
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131 {
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132 lifeCycle.stop();
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133 LOG.debug("Stopped {}",lifeCycle);
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134 }
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135
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136 if (lifeCycle instanceof Destroyable)
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137 {
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138 ((Destroyable)lifeCycle).destroy();
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139 LOG.debug("Destroyed {}",lifeCycle);
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140 }
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141 }
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142 catch (Exception ex)
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143 {
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144 LOG.debug("",ex);
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145 }
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146 }
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147 }
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148 }