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annotate src/org/eclipse/jetty/util/component/AggregateLifeCycle.java @ 889:5731a7707466
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 06 Oct 2016 23:24:30 -0600 |
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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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132 |
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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 public 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 /** Is the bean joined to the aggregate. |
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149 * @param bean |
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150 * @return True if the aggregate contains the bean and it is joined |
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151 */ |
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152 public boolean isManaged(Object bean) |
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153 { |
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154 for (Bean b:_beans) |
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155 if (b._bean==bean) |
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156 return b._managed; |
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157 return false; |
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158 } |
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159 |
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160 /* ------------------------------------------------------------ */ |
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161 /** |
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162 * Add an associated bean. |
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163 * If the bean is a {@link LifeCycle}, then it will be managed if it is not |
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164 * already started and umanaged if it is already started. The {@link #addBean(Object, boolean)} |
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165 * method should be used if this is not correct, or the {@link #manage(Object)} and {@link #unmanage(Object)} |
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166 * methods may be used after an add to change the status. |
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167 * @param o the bean object to add |
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168 * @return true if the bean was added or false if it has already been added. |
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169 */ |
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170 public boolean addBean(Object o) |
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171 { |
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172 // beans are joined unless they are started lifecycles |
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173 return addBean(o,!((o instanceof LifeCycle)&&((LifeCycle)o).isStarted())); |
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174 } |
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175 |
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176 /* ------------------------------------------------------------ */ |
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177 /** Add an associated lifecycle. |
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178 * @param o The lifecycle to add |
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179 * @param managed True if the LifeCycle is to be joined, otherwise it will be disjoint. |
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180 * @return true if bean was added, false if already present. |
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181 */ |
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182 public boolean addBean(Object o, boolean managed) |
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183 { |
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184 if (contains(o)) |
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185 return false; |
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186 |
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187 Bean b = new Bean(o); |
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188 b._managed=managed; |
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189 _beans.add(b); |
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190 |
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191 if (o instanceof LifeCycle) |
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192 { |
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193 LifeCycle l=(LifeCycle)o; |
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194 |
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195 // Start the bean if we are started |
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196 if (managed && _started) |
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197 { |
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198 try |
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199 { |
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200 l.start(); |
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201 } |
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202 catch(Exception e) |
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203 { |
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204 throw new RuntimeException (e); |
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205 } |
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206 } |
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207 } |
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208 return true; |
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209 } |
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210 |
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211 /* ------------------------------------------------------------ */ |
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212 /** Get dependent beans |
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213 * @return List of beans. |
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214 */ |
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215 public Collection<Object> getBeans() |
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216 { |
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217 return getBeans(Object.class); |
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218 } |
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219 |
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220 /* ------------------------------------------------------------ */ |
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221 /** Get dependent beans of a specific class |
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222 * @see #addBean(Object) |
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223 * @param clazz |
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224 * @return List of beans. |
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225 */ |
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226 public <T> List<T> getBeans(Class<T> clazz) |
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227 { |
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228 ArrayList<T> beans = new ArrayList<T>(); |
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229 for (Bean b:_beans) |
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230 { |
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231 if (clazz.isInstance(b._bean)) |
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232 beans.add((T)(b._bean)); |
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233 } |
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234 return beans; |
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235 } |
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236 |
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237 |
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238 /* ------------------------------------------------------------ */ |
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239 /** Get dependent beans of a specific class. |
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240 * If more than one bean of the type exist, the first is returned. |
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241 * @see #addBean(Object) |
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242 * @param clazz |
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243 * @return bean or null |
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244 */ |
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245 public <T> T getBean(Class<T> clazz) |
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246 { |
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247 for (Bean b:_beans) |
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248 { |
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249 if (clazz.isInstance(b._bean)) |
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250 return (T)b._bean; |
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251 } |
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252 |
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253 return null; |
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254 } |
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255 |
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256 /* ------------------------------------------------------------ */ |
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257 /** |
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258 * Remove all associated bean. |
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259 */ |
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260 public void removeBeans () |
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261 { |
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262 _beans.clear(); |
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263 } |
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264 |
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265 /* ------------------------------------------------------------ */ |
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266 /** |
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267 * Remove an associated bean. |
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268 */ |
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269 public boolean removeBean (Object o) |
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270 { |
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271 Iterator<Bean> i = _beans.iterator(); |
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272 while(i.hasNext()) |
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273 { |
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274 Bean b=i.next(); |
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275 if (b._bean==o) |
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276 { |
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277 _beans.remove(b); |
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278 return true; |
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279 } |
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280 } |
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281 return false; |
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282 } |
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283 |
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284 /* ------------------------------------------------------------ */ |
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285 public void dumpStdErr() |
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286 { |
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287 try |
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288 { |
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289 dump(System.err,""); |
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290 } |
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291 catch (IOException e) |
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292 { |
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293 LOG.warn("",e); |
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294 } |
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295 } |
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296 |
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297 /* ------------------------------------------------------------ */ |
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298 public String dump() |
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299 { |
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300 return dump(this); |
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301 } |
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302 |
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303 /* ------------------------------------------------------------ */ |
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304 public static String dump(Dumpable dumpable) |
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305 { |
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306 StringBuilder b = new StringBuilder(); |
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307 try |
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308 { |
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309 dumpable.dump(b,""); |
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310 } |
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311 catch (IOException e) |
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312 { |
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313 LOG.warn("",e); |
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314 } |
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315 return b.toString(); |
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316 } |
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317 |
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318 /* ------------------------------------------------------------ */ |
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319 public void dump(Appendable out) throws IOException |
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320 { |
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321 dump(out,""); |
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322 } |
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323 |
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324 /* ------------------------------------------------------------ */ |
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325 protected void dumpThis(Appendable out) throws IOException |
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326 { |
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327 out.append(String.valueOf(this)).append(" - ").append(getState()).append("\n"); |
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328 } |
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329 |
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330 /* ------------------------------------------------------------ */ |
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331 public static void dumpObject(Appendable out,Object o) throws IOException |
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332 { |
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333 try |
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334 { |
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335 if (o instanceof LifeCycle) |
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336 out.append(String.valueOf(o)).append(" - ").append((AbstractLifeCycle.getState((LifeCycle)o))).append("\n"); |
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337 else |
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338 out.append(String.valueOf(o)).append("\n"); |
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339 } |
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340 catch(Throwable th) |
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341 { |
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342 out.append(" => ").append(th.toString()).append('\n'); |
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343 } |
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344 } |
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345 |
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346 /* ------------------------------------------------------------ */ |
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347 public void dump(Appendable out,String indent) throws IOException |
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348 { |
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349 dumpThis(out); |
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350 int size=_beans.size(); |
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351 if (size==0) |
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352 return; |
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353 int i=0; |
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354 for (Bean b : _beans) |
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355 { |
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356 i++; |
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357 |
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358 out.append(indent).append(" +- "); |
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359 if (b._managed) |
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360 { |
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361 if (b._bean instanceof Dumpable) |
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362 ((Dumpable)b._bean).dump(out,indent+(i==size?" ":" | ")); |
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363 else |
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364 dumpObject(out,b._bean); |
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365 } |
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366 else |
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367 dumpObject(out,b._bean); |
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368 } |
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369 |
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370 if (i!=size) |
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371 out.append(indent).append(" |\n"); |
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372 } |
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373 |
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374 /* ------------------------------------------------------------ */ |
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375 public static void dump(Appendable out,String indent,Collection<?>... collections) throws IOException |
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376 { |
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377 if (collections.length==0) |
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378 return; |
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379 int size=0; |
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380 for (Collection<?> c : collections) |
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381 size+=c.size(); |
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382 if (size==0) |
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383 return; |
802
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|
384 |
864
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385 int i=0; |
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386 for (Collection<?> c : collections) |
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387 { |
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388 for (Object o : c) |
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389 { |
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390 i++; |
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391 out.append(indent).append(" +- "); |
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|
392 |
864
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393 if (o instanceof Dumpable) |
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394 ((Dumpable)o).dump(out,indent+(i==size?" ":" | ")); |
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395 else |
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396 dumpObject(out,o); |
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397 } |
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|
398 |
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399 if (i!=size) |
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400 out.append(indent).append(" |\n"); |
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|
401 } |
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|
402 } |
802
3428c60d7cfc
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|
403 } |