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annotate src/org/eclipse/jetty/util/component/AbstractLifeCycle.java @ 815:07c82fabc46b

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author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 09 Sep 2016 14:27:05 -0600
parents 3428c60d7cfc
children 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.component;
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20
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21 import java.util.concurrent.CopyOnWriteArrayList;
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22
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23 import org.eclipse.jetty.util.log.Log;
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24 import org.eclipse.jetty.util.log.Logger;
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25
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26 /**
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27 * Basic implementation of the life cycle interface for components.
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28 *
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29 *
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30 */
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31 public abstract class AbstractLifeCycle implements LifeCycle
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32 {
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33 private static final Logger LOG = Log.getLogger(AbstractLifeCycle.class);
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34 public static final String STOPPED="STOPPED";
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35 public static final String FAILED="FAILED";
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36 public static final String STARTING="STARTING";
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37 public static final String STARTED="STARTED";
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38 public static final String STOPPING="STOPPING";
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39 public static final String RUNNING="RUNNING";
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40
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41 private final Object _lock = new Object();
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42 private final int __FAILED = -1, __STOPPED = 0, __STARTING = 1, __STARTED = 2, __STOPPING = 3;
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43 private volatile int _state = __STOPPED;
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44
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45 protected final CopyOnWriteArrayList<LifeCycle.Listener> _listeners=new CopyOnWriteArrayList<LifeCycle.Listener>();
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46
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47 protected void doStart() throws Exception
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48 {
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49 }
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50
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51 protected void doStop() throws Exception
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52 {
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53 }
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54
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55 public final void start() throws Exception
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56 {
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57 synchronized (_lock)
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58 {
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59 try
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60 {
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61 if (_state == __STARTED || _state == __STARTING)
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62 return;
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63 setStarting();
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64 doStart();
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65 setStarted();
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66 }
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67 catch (Exception e)
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68 {
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69 setFailed(e);
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70 throw e;
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71 }
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72 catch (Error e)
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73 {
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74 setFailed(e);
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75 throw e;
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76 }
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77 }
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78 }
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79
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80 public final void stop() throws Exception
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81 {
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82 synchronized (_lock)
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83 {
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84 try
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85 {
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86 if (_state == __STOPPING || _state == __STOPPED)
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87 return;
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88 setStopping();
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89 doStop();
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90 setStopped();
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91 }
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92 catch (Exception e)
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93 {
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94 setFailed(e);
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95 throw e;
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96 }
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97 catch (Error e)
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98 {
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99 setFailed(e);
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100 throw e;
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101 }
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102 }
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103 }
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104
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105 public boolean isRunning()
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106 {
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107 final int state = _state;
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108
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109 return state == __STARTED || state == __STARTING;
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110 }
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111
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112 public boolean isStarted()
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113 {
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114 return _state == __STARTED;
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115 }
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116
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117 public boolean isStarting()
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118 {
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119 return _state == __STARTING;
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120 }
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121
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122 public boolean isStopping()
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123 {
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124 return _state == __STOPPING;
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125 }
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126
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127 public boolean isStopped()
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128 {
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129 return _state == __STOPPED;
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130 }
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131
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132 public boolean isFailed()
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133 {
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134 return _state == __FAILED;
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135 }
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136
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137 public void addLifeCycleListener(LifeCycle.Listener listener)
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138 {
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139 _listeners.add(listener);
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140 }
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141
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142 public void removeLifeCycleListener(LifeCycle.Listener listener)
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143 {
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144 _listeners.remove(listener);
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145 }
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146
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147 public String getState()
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148 {
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149 switch(_state)
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150 {
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151 case __FAILED: return FAILED;
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152 case __STARTING: return STARTING;
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153 case __STARTED: return STARTED;
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154 case __STOPPING: return STOPPING;
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155 case __STOPPED: return STOPPED;
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156 }
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157 return null;
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158 }
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159
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160 public static String getState(LifeCycle lc)
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161 {
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162 if (lc.isStarting()) return STARTING;
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163 if (lc.isStarted()) return STARTED;
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164 if (lc.isStopping()) return STOPPING;
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165 if (lc.isStopped()) return STOPPED;
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166 return FAILED;
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167 }
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168
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169 private void setStarted()
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170 {
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171 _state = __STARTED;
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172 LOG.debug(STARTED+" {}",this);
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173 for (Listener listener : _listeners)
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174 listener.lifeCycleStarted(this);
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175 }
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176
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177 private void setStarting()
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178 {
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179 LOG.debug("starting {}",this);
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180 _state = __STARTING;
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181 for (Listener listener : _listeners)
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182 listener.lifeCycleStarting(this);
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183 }
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184
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185 private void setStopping()
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186 {
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187 LOG.debug("stopping {}",this);
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188 _state = __STOPPING;
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189 for (Listener listener : _listeners)
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190 listener.lifeCycleStopping(this);
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191 }
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192
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193 private void setStopped()
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194 {
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195 _state = __STOPPED;
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196 LOG.debug("{} {}",STOPPED,this);
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197 for (Listener listener : _listeners)
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198 listener.lifeCycleStopped(this);
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199 }
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200
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201 private void setFailed(Throwable th)
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202 {
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203 _state = __FAILED;
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204 LOG.warn(FAILED+" " + this+": "+th,th);
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205 for (Listener listener : _listeners)
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206 listener.lifeCycleFailure(this,th);
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207 }
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208
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209 public static abstract class AbstractLifeCycleListener implements LifeCycle.Listener
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210 {
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211 public void lifeCycleFailure(LifeCycle event, Throwable cause) {}
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212 public void lifeCycleStarted(LifeCycle event) {}
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213 public void lifeCycleStarting(LifeCycle event) {}
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214 public void lifeCycleStopped(LifeCycle event) {}
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215 public void lifeCycleStopping(LifeCycle event) {}
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216 }
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217 }