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annotate src/org/eclipse/jetty/util/component/AggregateLifeCycle.java @ 910:9b65e8064f90

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simplify AggregateLifeCycle
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 08 Oct 2016 21:30:32 -0600
parents e21ca9878a10
children 1d0c304e12b5
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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.io.IOException;
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22 import java.util.ArrayList;
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23 import java.util.Collection;
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24 import java.util.Collections;
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25 import java.util.Iterator;
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26 import java.util.List;
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27 import java.util.concurrent.CopyOnWriteArrayList;
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28
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29 import org.slf4j.Logger;
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30 import org.slf4j.LoggerFactory;
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31
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32 /**
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33 * An AggregateLifeCycle is an {@link LifeCycle} implementation for a collection of contained beans.
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34 * <p>
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35 * Beans can be added the AggregateLifeCycle either as managed beans or as unmanaged beans. A managed bean is started, stopped and destroyed with the aggregate.
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36 * An unmanaged bean is associated with the aggregate for the purposes of {@link #dump()}, but it's lifecycle must be managed externally.
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37 * <p>
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38 * When a bean is added, if it is a {@link LifeCycle} and it is already started, then it is assumed to be an unmanaged bean.
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39 * Otherwise the methods {@link #addBean(Object, boolean)}, {@link #manage(Object)} and {@link #unmanage(Object)} can be used to
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40 * explicitly control the life cycle relationship.
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41 * <p>
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42 * If adding a bean that is shared between multiple {@link AggregateLifeCycle} instances, then it should be started before being added, so it is unmanaged, or
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43 * the API must be used to explicitly set it as unmanaged.
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44 * <p>
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45 */
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46 public class AggregateLifeCycle extends AbstractLifeCycle implements Destroyable, Dumpable
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47 {
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48 private static final Logger LOG = LoggerFactory.getLogger(AggregateLifeCycle.class);
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49 private final List<Bean> _beans=new CopyOnWriteArrayList<Bean>();
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50 private boolean _started=false;
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51
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52 private class Bean
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53 {
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54 Bean(Object b)
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55 {
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56 _bean=b;
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57 }
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58 final Object _bean;
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59 volatile boolean _managed=true;
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60
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61 public String toString()
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62 {
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63 return "{"+_bean+","+_managed+"}";
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64 }
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65 }
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66
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67 /* ------------------------------------------------------------ */
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68 /**
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69 * Start the managed lifecycle beans in the order they were added.
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70 * @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
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71 */
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72 @Override
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73 protected void doStart() throws Exception
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74 {
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75 for (Bean b:_beans)
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76 {
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77 if (b._managed && b._bean instanceof LifeCycle)
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78 {
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79 LifeCycle l=(LifeCycle)b._bean;
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80 if (!l.isRunning())
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81 l.start();
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82 }
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83 }
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84 // indicate that we are started, so that addBean will start other beans added.
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85 _started=true;
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86 super.doStart();
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 /**
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91 * Stop the joined lifecycle beans in the reverse order they were added.
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92 * @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
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93 */
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94 @Override
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95 protected void doStop() throws Exception
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96 {
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97 _started=false;
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98 super.doStop();
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99 List<Bean> reverse = new ArrayList<Bean>(_beans);
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100 Collections.reverse(reverse);
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101 for (Bean b:reverse)
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102 {
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103 if (b._managed && b._bean instanceof LifeCycle)
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104 {
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105 LifeCycle l=(LifeCycle)b._bean;
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106 if (l.isRunning())
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107 l.stop();
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108 }
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109 }
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110 }
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111
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112
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113 /* ------------------------------------------------------------ */
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114 /**
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115 * Destroy the joined Destroyable beans in the reverse order they were added.
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116 * @see org.eclipse.jetty.util.component.Destroyable#destroy()
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117 */
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118 public void destroy()
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119 {
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120 List<Bean> reverse = new ArrayList<Bean>(_beans);
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121 Collections.reverse(reverse);
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122 for (Bean b:reverse)
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123 {
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124 if (b._bean instanceof Destroyable && b._managed)
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125 {
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126 Destroyable d=(Destroyable)b._bean;
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127 d.destroy();
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128 }
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129 }
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130 _beans.clear();
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131 }
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133
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134 /* ------------------------------------------------------------ */
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135 /** Is the bean contained in the aggregate.
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136 * @param bean
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137 * @return True if the aggregate contains the bean
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138 */
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139 private boolean contains(Object bean)
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140 {
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141 for (Bean b:_beans)
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142 if (b._bean==bean)
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143 return true;
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144 return false;
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145 }
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146
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147 /* ------------------------------------------------------------ */
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148 /**
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149 * Add an associated bean.
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150 * If the bean is a {@link LifeCycle}, then it will be managed if it is not
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151 * already started and umanaged if it is already started. The {@link #addBean(Object, boolean)}
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152 * method should be used if this is not correct, or the {@link #manage(Object)} and {@link #unmanage(Object)}
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153 * methods may be used after an add to change the status.
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154 * @param o the bean object to add
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155 * @return true if the bean was added or false if it has already been added.
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156 */
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157 public boolean addBean(Object o)
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158 {
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159 // beans are joined unless they are started lifecycles
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160 return addBean(o,!((o instanceof LifeCycle)&&((LifeCycle)o).isStarted()));
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161 }
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162
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163 /* ------------------------------------------------------------ */
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164 /** Add an associated lifecycle.
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165 * @param o The lifecycle to add
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166 * @param managed True if the LifeCycle is to be joined, otherwise it will be disjoint.
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167 * @return true if bean was added, false if already present.
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168 */
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169 public boolean addBean(Object o, boolean managed)
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170 {
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171 if (contains(o))
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172 return false;
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173
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174 Bean b = new Bean(o);
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175 b._managed=managed;
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176 _beans.add(b);
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177
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178 if (o instanceof LifeCycle)
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179 {
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180 LifeCycle l=(LifeCycle)o;
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181
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182 // Start the bean if we are started
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183 if (managed && _started)
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184 {
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185 try
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186 {
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187 l.start();
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188 }
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189 catch(Exception e)
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190 {
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191 throw new RuntimeException (e);
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192 }
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193 }
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194 }
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195 return true;
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196 }
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197
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198 /* ------------------------------------------------------------ */
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199 /** Get dependent beans
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200 * @return List of beans.
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201 */
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202 public Collection<Object> getBeans()
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203 {
910
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204 List<Object> beans = new ArrayList<Object>();
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205 beans.addAll(_beans);
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206 return beans;
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207 }
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208
864
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209
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210 /* ------------------------------------------------------------ */
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211 /** Get dependent beans of a specific class.
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212 * If more than one bean of the type exist, the first is returned.
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213 * @see #addBean(Object)
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214 * @param clazz
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215 * @return bean or null
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216 */
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217 public <T> T getBean(Class<T> clazz)
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218 {
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219 for (Bean b:_beans)
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220 {
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221 if (clazz.isInstance(b._bean))
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222 return (T)b._bean;
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223 }
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224
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225 return null;
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226 }
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227
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228 /* ------------------------------------------------------------ */
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229 /**
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230 * Remove an associated bean.
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231 */
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232 public boolean removeBean (Object o)
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233 {
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234 Iterator<Bean> i = _beans.iterator();
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235 while(i.hasNext())
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236 {
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237 Bean b=i.next();
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238 if (b._bean==o)
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239 {
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240 _beans.remove(b);
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241 return true;
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242 }
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243 }
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244 return false;
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245 }
802
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246
864
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247 /* ------------------------------------------------------------ */
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248 public void dumpStdErr()
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249 {
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250 try
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251 {
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252 dump(System.err,"");
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253 }
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254 catch (IOException e)
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255 {
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256 LOG.warn("",e);
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257 }
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258 }
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259
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260 /* ------------------------------------------------------------ */
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261 public String dump()
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262 {
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263 return dump(this);
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264 }
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265
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266 /* ------------------------------------------------------------ */
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267 public static String dump(Dumpable dumpable)
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268 {
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269 StringBuilder b = new StringBuilder();
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270 try
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271 {
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272 dumpable.dump(b,"");
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273 }
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274 catch (IOException e)
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diff changeset
275 {
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276 LOG.warn("",e);
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277 }
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278 return b.toString();
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279 }
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280
864
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281 /* ------------------------------------------------------------ */
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282 public void dump(Appendable out) throws IOException
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283 {
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284 dump(out,"");
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285 }
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286
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287 /* ------------------------------------------------------------ */
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288 protected void dumpThis(Appendable out) throws IOException
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289 {
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290 out.append(String.valueOf(this)).append(" - ").append(getState()).append("\n");
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291 }
802
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292
864
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293 /* ------------------------------------------------------------ */
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294 public static void dumpObject(Appendable out,Object o) throws IOException
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295 {
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296 try
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297 {
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298 if (o instanceof LifeCycle)
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diff changeset
299 out.append(String.valueOf(o)).append(" - ").append((AbstractLifeCycle.getState((LifeCycle)o))).append("\n");
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300 else
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diff changeset
301 out.append(String.valueOf(o)).append("\n");
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diff changeset
302 }
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diff changeset
303 catch(Throwable th)
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diff changeset
304 {
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diff changeset
305 out.append(" => ").append(th.toString()).append('\n');
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306 }
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307 }
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308
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diff changeset
309 /* ------------------------------------------------------------ */
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diff changeset
310 public void dump(Appendable out,String indent) throws IOException
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311 {
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312 dumpThis(out);
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313 int size=_beans.size();
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314 if (size==0)
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315 return;
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316 int i=0;
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317 for (Bean b : _beans)
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diff changeset
318 {
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319 i++;
802
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320
864
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diff changeset
321 out.append(indent).append(" +- ");
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diff changeset
322 if (b._managed)
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diff changeset
323 {
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diff changeset
324 if (b._bean instanceof Dumpable)
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diff changeset
325 ((Dumpable)b._bean).dump(out,indent+(i==size?" ":" | "));
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diff changeset
326 else
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327 dumpObject(out,b._bean);
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diff changeset
328 }
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diff changeset
329 else
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330 dumpObject(out,b._bean);
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diff changeset
331 }
802
3428c60d7cfc replace jetty jars with source
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332
864
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diff changeset
333 if (i!=size)
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diff changeset
334 out.append(indent).append(" |\n");
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diff changeset
335 }
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diff changeset
336
e21ca9878a10 simplify ThreadPool use
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diff changeset
337 /* ------------------------------------------------------------ */
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diff changeset
338 public static void dump(Appendable out,String indent,Collection<?>... collections) throws IOException
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parents: 820
diff changeset
339 {
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diff changeset
340 if (collections.length==0)
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diff changeset
341 return;
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diff changeset
342 int size=0;
e21ca9878a10 simplify ThreadPool use
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diff changeset
343 for (Collection<?> c : collections)
e21ca9878a10 simplify ThreadPool use
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diff changeset
344 size+=c.size();
e21ca9878a10 simplify ThreadPool use
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diff changeset
345 if (size==0)
e21ca9878a10 simplify ThreadPool use
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diff changeset
346 return;
802
3428c60d7cfc replace jetty jars with source
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diff changeset
347
864
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348 int i=0;
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349 for (Collection<?> c : collections)
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350 {
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351 for (Object o : c)
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352 {
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353 i++;
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354 out.append(indent).append(" +- ");
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355
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356 if (o instanceof Dumpable)
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357 ((Dumpable)o).dump(out,indent+(i==size?" ":" | "));
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358 else
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359 dumpObject(out,o);
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360 }
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361
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362 if (i!=size)
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363 out.append(indent).append(" |\n");
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364 }
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365 }
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366 }