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annotate src/org/eclipse/jetty/util/component/AbstractLifeCycle.java @ 997:7d28be82ab75

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simplify Request
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 18 Oct 2016 22:43:17 -0600
parents 5dfb10ec0ca5
children 3fa54d9d19cd
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rev   line source
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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.slf4j.Logger;
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24 import org.slf4j.LoggerFactory;
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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 = LoggerFactory.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 void doStart() throws Exception
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46 {
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47 }
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48
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49 protected void doStop() throws Exception
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50 {
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51 }
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52
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53 public final void start() throws Exception
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54 {
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55 synchronized (_lock)
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56 {
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57 try
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58 {
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59 if (_state == __STARTED || _state == __STARTING)
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60 return;
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61 setStarting();
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62 doStart();
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63 setStarted();
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64 }
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65 catch (Exception e)
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66 {
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67 setFailed(e);
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68 throw e;
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69 }
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70 catch (Error e)
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71 {
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72 setFailed(e);
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73 throw e;
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74 }
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75 }
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76 }
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77
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78 public final void stop() throws Exception
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79 {
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80 synchronized (_lock)
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81 {
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82 try
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83 {
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84 if (_state == __STOPPING || _state == __STOPPED)
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85 return;
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86 setStopping();
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87 doStop();
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88 setStopped();
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89 }
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90 catch (Exception e)
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91 {
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92 setFailed(e);
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93 throw e;
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94 }
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95 catch (Error e)
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96 {
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97 setFailed(e);
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98 throw e;
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99 }
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100 }
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101 }
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102
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103 public boolean isRunning()
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104 {
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105 final int state = _state;
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106
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107 return state == __STARTED || state == __STARTING;
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108 }
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109
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110 public boolean isStarted()
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111 {
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112 return _state == __STARTED;
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113 }
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114
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115 public boolean isStarting()
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116 {
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117 return _state == __STARTING;
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118 }
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119
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120 public boolean isStopping()
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121 {
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122 return _state == __STOPPING;
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123 }
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124
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125 public boolean isStopped()
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126 {
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127 return _state == __STOPPED;
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128 }
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129
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130 public boolean isFailed()
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131 {
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132 return _state == __FAILED;
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133 }
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134
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135 public String getState()
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136 {
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137 switch(_state)
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138 {
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139 case __FAILED: return FAILED;
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140 case __STARTING: return STARTING;
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141 case __STARTED: return STARTED;
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142 case __STOPPING: return STOPPING;
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143 case __STOPPED: return STOPPED;
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144 }
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145 return null;
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146 }
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147
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148 public static String getState(LifeCycle lc)
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149 {
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150 if (lc.isStarting()) return STARTING;
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151 if (lc.isStarted()) return STARTED;
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152 if (lc.isStopping()) return STOPPING;
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153 if (lc.isStopped()) return STOPPED;
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154 return FAILED;
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155 }
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156
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157 private void setStarted()
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158 {
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159 _state = __STARTED;
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160 LOG.debug(STARTED+" {}",this);
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161 }
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162
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163 private void setStarting()
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164 {
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165 LOG.debug("starting {}",this);
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166 _state = __STARTING;
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167 }
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168
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169 private void setStopping()
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170 {
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171 LOG.debug("stopping {}",this);
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172 _state = __STOPPING;
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173 }
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174
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175 private void setStopped()
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176 {
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177 _state = __STOPPED;
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178 LOG.debug("{} {}",STOPPED,this);
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179 }
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180
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181 private void setFailed(Throwable th)
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182 {
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183 _state = __FAILED;
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184 LOG.warn(FAILED+" " + this+": "+th,th);
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185 }
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186
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187 }