Mercurial Hosting > luan
annotate src/org/eclipse/jetty/util/component/AbstractLifeCycle.java @ 808:b3176fd168bf
replace use of jetty.util.B64Code with java.util.Base64
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 08 Sep 2016 16:13:27 -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 } |