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annotate src/org/eclipse/jetty/util/component/AggregateLifeCycle.java @ 1048:2b769da7f67d

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 07 Nov 2016 23:15:42 -0700
parents 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(LifeCycle b,boolean managed)
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55 {
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56 _bean = b;
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57 _managed = managed;
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58 }
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59 final LifeCycle _bean;
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60 final boolean _managed;
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61
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62 public String toString()
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63 {
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64 return "{"+_bean+","+_managed+"}";
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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 /**
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70 * Start the managed lifecycle beans in the order they were added.
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71 * @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
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72 */
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73 @Override
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74 protected void doStart() throws Exception
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75 {
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76 for (Bean b:_beans)
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77 {
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78 if (b._managed)
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79 {
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80 LifeCycle l = b._bean;
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81 if (!l.isRunning())
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82 l.start();
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83 }
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84 }
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85 // indicate that we are started, so that addBean will start other beans added.
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86 _started = true;
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87 super.doStart();
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88 }
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89
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90 /* ------------------------------------------------------------ */
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91 /**
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92 * Stop the joined lifecycle beans in the reverse order they were added.
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93 * @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
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94 */
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95 @Override
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96 protected void doStop() throws Exception
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97 {
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98 _started = false;
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99 super.doStop();
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100 List<Bean> reverse = new ArrayList<Bean>(_beans);
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101 Collections.reverse(reverse);
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102 for (Bean b:reverse)
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103 {
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104 if (b._managed)
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105 {
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106 LifeCycle l = b._bean;
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107 if (l.isRunning())
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108 l.stop();
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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 /**
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116 * Destroy the joined Destroyable beans in the reverse order they were added.
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117 * @see org.eclipse.jetty.util.component.Destroyable#destroy()
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118 */
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119 public void destroy()
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120 {
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121 List<Bean> reverse = new ArrayList<Bean>(_beans);
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122 Collections.reverse(reverse);
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123 for (Bean b:reverse)
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124 {
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125 if (b._bean instanceof Destroyable && b._managed)
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126 {
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127 Destroyable d = (Destroyable)b._bean;
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128 d.destroy();
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129 }
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130 }
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131 _beans.clear();
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132 }
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133
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134
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135 /* ------------------------------------------------------------ */
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136 /** Is the bean contained in the aggregate.
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137 * @param bean
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138 * @return True if the aggregate contains the bean
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139 */
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140 private boolean contains(LifeCycle bean)
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141 {
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142 for (Bean b:_beans)
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143 if (b._bean==bean)
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144 return true;
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145 return false;
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146 }
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147
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148 /* ------------------------------------------------------------ */
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149 /**
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150 * Add an associated bean.
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151 * If the bean is a {@link LifeCycle}, then it will be managed if it is not
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152 * already started and umanaged if it is already started. The {@link #addBean(Object, boolean)}
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153 * method should be used if this is not correct, or the {@link #manage(Object)} and {@link #unmanage(Object)}
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154 * methods may be used after an add to change the status.
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155 * @param o the bean object to add
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156 * @return true if the bean was added or false if it has already been added.
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157 */
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158 public boolean addBean(LifeCycle o)
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159 {
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160 // beans are joined unless they are started lifecycles
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161 return addBean(o,!o.isStarted());
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162 }
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163
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164 /* ------------------------------------------------------------ */
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165 /** Add an associated lifecycle.
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166 * @param o The lifecycle to add
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167 * @param managed True if the LifeCycle is to be joined, otherwise it will be disjoint.
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168 * @return true if bean was added, false if already present.
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169 */
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170 public boolean addBean(LifeCycle o, boolean managed)
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171 {
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172 if (contains(o))
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173 return false;
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174
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175 Bean b = new Bean(o,managed);
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176 _beans.add(b);
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177
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178 // Start the bean if we are started
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179 if (managed && _started)
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180 {
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181 try
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182 {
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183 o.start();
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184 }
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185 catch(Exception e)
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186 {
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187 throw new RuntimeException(e);
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188 }
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189 }
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190 return true;
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191 }
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192
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193 /* ------------------------------------------------------------ */
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194 /** Get dependent beans
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195 * @return List of beans.
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196 */
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197 public Collection<Object> getBeans()
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198 {
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199 // return new ArrayList<Object>(_beans);
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200 ArrayList<Object> beans = new ArrayList<Object>();
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201 for (Bean b:_beans) {
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202 beans.add(b._bean);
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203 }
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204 return beans;
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205 }
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206
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207
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208 /* ------------------------------------------------------------ */
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209 /**
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210 * Remove an associated bean.
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211 */
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212 public boolean removeBean (LifeCycle o)
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213 {
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214 Iterator<Bean> i = _beans.iterator();
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215 while(i.hasNext())
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216 {
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217 Bean b=i.next();
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218 if (b._bean==o)
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219 {
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220 _beans.remove(b);
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221 return true;
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222 }
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223 }
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224 return false;
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225 }
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226
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227 public String dump()
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228 {
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229 return dump(this);
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230 }
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231
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232 public static String dump(Dumpable dumpable)
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233 {
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234 StringBuilder b = new StringBuilder();
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235 try
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236 {
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237 dumpable.dump(b,"");
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238 }
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239 catch (IOException e)
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240 {
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241 LOG.warn("",e);
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242 }
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243 return b.toString();
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244 }
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245
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246 private void dump(Appendable out) throws IOException
864
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247 {
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248 dump(out,"");
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249 }
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250
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251 private void dumpThis(Appendable out) throws IOException
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252 {
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253 out.append(String.valueOf(this)).append(" - ").append(getState()).append("\n");
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254 }
802
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255
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256 public static void dumpObject(Appendable out,Object o) throws IOException
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257 {
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258 try
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259 {
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260 if (o instanceof LifeCycle)
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261 out.append(String.valueOf(o)).append(" - ").append((AbstractLifeCycle.getState((LifeCycle)o))).append("\n");
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262 else
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263 out.append(String.valueOf(o)).append("\n");
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264 }
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265 catch(Throwable th)
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266 {
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267 out.append(" => ").append(th.toString()).append('\n');
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268 }
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269 }
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270
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271 public void dump(Appendable out,String indent) throws IOException
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272 {
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273 dumpThis(out);
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274 int size=_beans.size();
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275 if (size==0)
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276 return;
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277 int i=0;
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278 for (Bean b : _beans)
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279 {
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280 i++;
802
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281
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282 out.append(indent).append(" +- ");
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283 if (b._managed)
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284 {
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285 if (b._bean instanceof Dumpable)
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286 ((Dumpable)b._bean).dump(out,indent+(i==size?" ":" | "));
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287 else
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288 dumpObject(out,b._bean);
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289 }
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290 else
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291 dumpObject(out,b._bean);
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292 }
802
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293
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294 if (i!=size)
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295 out.append(indent).append(" |\n");
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296 }
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297
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298 public static void dump(Appendable out,String indent,Collection<?>... collections) throws IOException
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299 {
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300 if (collections.length==0)
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301 return;
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302 int size=0;
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303 for (Collection<?> c : collections)
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304 size+=c.size();
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305 if (size==0)
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306 return;
802
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307
864
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308 int i=0;
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309 for (Collection<?> c : collections)
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310 {
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311 for (Object o : c)
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312 {
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313 i++;
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314 out.append(indent).append(" +- ");
802
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315
864
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316 if (o instanceof Dumpable)
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317 ((Dumpable)o).dump(out,indent+(i==size?" ":" | "));
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318 else
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319 dumpObject(out,o);
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320 }
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diff changeset
321
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322 if (i!=size)
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323 out.append(indent).append(" |\n");
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diff changeset
324 }
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325 }
802
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326 }