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annotate src/org/eclipse/jetty/server/handler/HandlerCollection.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -0600
parents 3428c60d7cfc
children 22a4e93ed20e
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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.server.handler;
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20
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21 import java.io.IOException;
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22 import java.util.concurrent.CountDownLatch;
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23
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24 import javax.servlet.ServletException;
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25 import javax.servlet.http.HttpServletRequest;
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26 import javax.servlet.http.HttpServletResponse;
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27
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28 import org.eclipse.jetty.server.Handler;
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29 import org.eclipse.jetty.server.Request;
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30 import org.eclipse.jetty.server.Server;
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31 import org.eclipse.jetty.util.LazyList;
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32 import org.eclipse.jetty.util.MultiException;
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33
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34 /* ------------------------------------------------------------ */
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35 /** A collection of handlers.
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36 * <p>
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37 * The default implementations calls all handlers in list order,
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38 * regardless of the response status or exceptions. Derived implementation
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39 * may alter the order or the conditions of calling the contained
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40 * handlers.
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41 * <p>
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42 *
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43 * @org.apache.xbean.XBean
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44 */
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45 public class HandlerCollection extends AbstractHandlerContainer
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46 {
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47 private final boolean _mutableWhenRunning;
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48 private volatile Handler[] _handlers;
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49 private boolean _parallelStart=false;
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50
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51 /* ------------------------------------------------------------ */
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52 public HandlerCollection()
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53 {
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54 _mutableWhenRunning=false;
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55 }
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56
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57 /* ------------------------------------------------------------ */
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58 public HandlerCollection(boolean mutableWhenRunning)
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59 {
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60 _mutableWhenRunning=mutableWhenRunning;
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61 }
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62
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63 /* ------------------------------------------------------------ */
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64 /**
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65 * @return Returns the handlers.
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66 */
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67 public Handler[] getHandlers()
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68 {
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69 return _handlers;
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70 }
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71
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72 /* ------------------------------------------------------------ */
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73 /**
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74 *
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75 * @param handlers The handlers to set.
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76 */
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77 public void setHandlers(Handler[] handlers)
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78 {
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79 if (!_mutableWhenRunning && isStarted())
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80 throw new IllegalStateException(STARTED);
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81
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82 Handler [] old_handlers = _handlers==null?null:_handlers.clone();
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83 _handlers = handlers;
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84
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85 Server server = getServer();
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86 MultiException mex = new MultiException();
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87 for (int i=0;handlers!=null && i<handlers.length;i++)
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88 {
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89 if (handlers[i].getServer()!=server)
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90 handlers[i].setServer(server);
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91 }
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92
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93 if (getServer()!=null)
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94 getServer().getContainer().update(this, old_handlers, handlers, "handler");
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95
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96 // stop old handlers
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97 for (int i=0;old_handlers!=null && i<old_handlers.length;i++)
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98 {
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99 if (old_handlers[i]!=null)
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100 {
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101 try
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102 {
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103 if (old_handlers[i].isStarted())
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104 old_handlers[i].stop();
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105 }
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106 catch (Throwable e)
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107 {
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108 mex.add(e);
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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 mex.ifExceptionThrowRuntime();
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114 }
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115
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116
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117
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118 /* ------------------------------------------------------------ */
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119 /** Get the parrallelStart.
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120 * @return true if the contained handlers are started in parallel.
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121 */
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122 public boolean isParallelStart()
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123 {
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124 return _parallelStart;
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125 }
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126
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127
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128
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129 /* ------------------------------------------------------------ */
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130 /** Set the parallelStart.
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131 * @param parallelStart If true, contained handlers are started in parallel.
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132 */
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133 public void setParallelStart(boolean parallelStart)
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134 {
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135 this._parallelStart = parallelStart;
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136 }
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137
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138
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139 /* ------------------------------------------------------------ */
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140 /**
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141 * @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse)
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142 */
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143 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
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144 throws IOException, ServletException
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145 {
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146 if (_handlers!=null && isStarted())
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147 {
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148 MultiException mex=null;
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149
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150 for (int i=0;i<_handlers.length;i++)
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151 {
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152 try
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153 {
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154 _handlers[i].handle(target,baseRequest, request, response);
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155 }
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156 catch(IOException e)
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157 {
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158 throw e;
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159 }
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160 catch(RuntimeException e)
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161 {
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162 throw e;
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163 }
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164 catch(Exception e)
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165 {
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166 if (mex==null)
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167 mex=new MultiException();
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168 mex.add(e);
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169 }
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170 }
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171 if (mex!=null)
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172 {
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173 if (mex.size()==1)
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174 throw new ServletException(mex.getThrowable(0));
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175 else
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176 throw new ServletException(mex);
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177 }
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178
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179 }
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180 }
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181
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182 /* ------------------------------------------------------------ */
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183 /*
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184 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStart()
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185 */
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186 @Override
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187 protected void doStart() throws Exception
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188 {
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189 final MultiException mex=new MultiException();
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190 if (_handlers!=null)
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191 {
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192 if (_parallelStart)
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193 {
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194 final CountDownLatch latch = new CountDownLatch(_handlers.length);
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195 final ClassLoader loader = Thread.currentThread().getContextClassLoader();
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196 for (int i=0;i<_handlers.length;i++)
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197 {
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198 final int h=i;
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199 getServer().getThreadPool().dispatch(
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200 new Runnable()
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201 {
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202 public void run()
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203 {
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204 ClassLoader orig = Thread.currentThread().getContextClassLoader();
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205 try
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206 {
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207 Thread.currentThread().setContextClassLoader(loader);
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208 _handlers[h].start();
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209 }
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210 catch(Throwable e)
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211 {
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212 mex.add(e);
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213 }
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214 finally
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215 {
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216 Thread.currentThread().setContextClassLoader(orig);
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217 latch.countDown();
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218 }
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219 }
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220 }
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221 );
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222 }
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223 latch.await();
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224 }
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225 else
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226 {
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227 for (int i=0;i<_handlers.length;i++)
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228 {
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229 try{_handlers[i].start();}
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230 catch(Throwable e){mex.add(e);}
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231 }
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232 }
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233 }
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234 super.doStart();
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235 mex.ifExceptionThrow();
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236 }
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237
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238 /* ------------------------------------------------------------ */
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239 /*
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240 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStop()
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241 */
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242 @Override
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243 protected void doStop() throws Exception
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244 {
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245 MultiException mex=new MultiException();
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246 try { super.doStop(); } catch(Throwable e){mex.add(e);}
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247 if (_handlers!=null)
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248 {
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249 for (int i=_handlers.length;i-->0;)
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250 try{_handlers[i].stop();}catch(Throwable e){mex.add(e);}
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251 }
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252 mex.ifExceptionThrow();
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253 }
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254
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255 /* ------------------------------------------------------------ */
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256 @Override
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257 public void setServer(Server server)
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258 {
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259 if (isStarted())
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260 throw new IllegalStateException(STARTED);
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261
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262 Server old_server=getServer();
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263
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264 super.setServer(server);
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265
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266 Handler[] h=getHandlers();
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267 for (int i=0;h!=null && i<h.length;i++)
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268 h[i].setServer(server);
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269
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270 if (server!=null && server!=old_server)
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271 server.getContainer().update(this, null,_handlers, "handler");
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272
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273 }
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274
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275 /* ------------------------------------------------------------ */
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276 /* Add a handler.
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277 * This implementation adds the passed handler to the end of the existing collection of handlers.
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278 * @see org.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.Handler)
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279 */
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280 public void addHandler(Handler handler)
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281 {
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282 setHandlers((Handler[])LazyList.addToArray(getHandlers(), handler, Handler.class));
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283 }
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284
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285 /* ------------------------------------------------------------ */
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286 public void removeHandler(Handler handler)
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287 {
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288 Handler[] handlers = getHandlers();
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289
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290 if (handlers!=null && handlers.length>0 )
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291 setHandlers((Handler[])LazyList.removeFromArray(handlers, handler));
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292 }
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293
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294 /* ------------------------------------------------------------ */
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295 @Override
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296 protected Object expandChildren(Object list, Class byClass)
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297 {
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298 Handler[] handlers = getHandlers();
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299 for (int i=0;handlers!=null && i<handlers.length;i++)
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300 list=expandHandler(handlers[i], list, byClass);
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301 return list;
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302 }
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303
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304 /* ------------------------------------------------------------ */
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305 @Override
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306 public void destroy()
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307 {
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308 if (!isStopped())
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309 throw new IllegalStateException("!STOPPED");
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310 Handler[] children=getChildHandlers();
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311 setHandlers(null);
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312 for (Handler child: children)
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313 child.destroy();
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314 super.destroy();
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315 }
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316 }