annotate src/org/eclipse/jetty/server/handler/HandlerCollection.java @ 850:4afdd0091511

remove MovedContextHandler
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 19:39:15 -0600
parents 22a4e93ed20e
children 6b210bb66c63
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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 // stop old handlers
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94 for (int i=0;old_handlers!=null && i<old_handlers.length;i++)
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95 {
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96 if (old_handlers[i]!=null)
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97 {
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98 try
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99 {
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100 if (old_handlers[i].isStarted())
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101 old_handlers[i].stop();
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102 }
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103 catch (Throwable e)
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104 {
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105 mex.add(e);
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106 }
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107 }
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108 }
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109
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110 mex.ifExceptionThrowRuntime();
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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 /** Get the parrallelStart.
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117 * @return true if the contained handlers are started in parallel.
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118 */
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119 public boolean isParallelStart()
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120 {
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121 return _parallelStart;
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122 }
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123
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124
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125
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126 /* ------------------------------------------------------------ */
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127 /** Set the parallelStart.
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128 * @param parallelStart If true, contained handlers are started in parallel.
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129 */
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130 public void setParallelStart(boolean parallelStart)
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131 {
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132 this._parallelStart = parallelStart;
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133 }
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134
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135
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136 /* ------------------------------------------------------------ */
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137 /**
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138 * @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse)
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139 */
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140 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
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141 throws IOException, ServletException
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142 {
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143 if (_handlers!=null && isStarted())
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144 {
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145 MultiException mex=null;
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146
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147 for (int i=0;i<_handlers.length;i++)
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148 {
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149 try
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150 {
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151 _handlers[i].handle(target,baseRequest, request, response);
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152 }
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153 catch(IOException e)
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154 {
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155 throw e;
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156 }
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157 catch(RuntimeException e)
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158 {
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159 throw e;
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160 }
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161 catch(Exception e)
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162 {
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163 if (mex==null)
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164 mex=new MultiException();
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165 mex.add(e);
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166 }
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167 }
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168 if (mex!=null)
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169 {
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170 if (mex.size()==1)
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171 throw new ServletException(mex.getThrowable(0));
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172 else
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173 throw new ServletException(mex);
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174 }
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175
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176 }
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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 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStart()
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182 */
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183 @Override
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184 protected void doStart() throws Exception
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185 {
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186 final MultiException mex=new MultiException();
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187 if (_handlers!=null)
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188 {
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189 if (_parallelStart)
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190 {
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191 final CountDownLatch latch = new CountDownLatch(_handlers.length);
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192 final ClassLoader loader = Thread.currentThread().getContextClassLoader();
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193 for (int i=0;i<_handlers.length;i++)
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194 {
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195 final int h=i;
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196 getServer().getThreadPool().dispatch(
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197 new Runnable()
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198 {
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199 public void run()
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200 {
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201 ClassLoader orig = Thread.currentThread().getContextClassLoader();
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202 try
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203 {
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204 Thread.currentThread().setContextClassLoader(loader);
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205 _handlers[h].start();
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206 }
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207 catch(Throwable e)
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208 {
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209 mex.add(e);
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210 }
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211 finally
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212 {
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213 Thread.currentThread().setContextClassLoader(orig);
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214 latch.countDown();
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215 }
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216 }
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217 }
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218 );
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219 }
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220 latch.await();
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221 }
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222 else
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223 {
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224 for (int i=0;i<_handlers.length;i++)
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225 {
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226 try{_handlers[i].start();}
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227 catch(Throwable e){mex.add(e);}
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228 }
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229 }
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230 }
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231 super.doStart();
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232 mex.ifExceptionThrow();
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233 }
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234
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235 /* ------------------------------------------------------------ */
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236 /*
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237 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStop()
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238 */
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239 @Override
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240 protected void doStop() throws Exception
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241 {
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242 MultiException mex=new MultiException();
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243 try { super.doStop(); } catch(Throwable e){mex.add(e);}
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244 if (_handlers!=null)
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245 {
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246 for (int i=_handlers.length;i-->0;)
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247 try{_handlers[i].stop();}catch(Throwable e){mex.add(e);}
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248 }
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249 mex.ifExceptionThrow();
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250 }
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251
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252 /* ------------------------------------------------------------ */
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253 @Override
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254 public void setServer(Server server)
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255 {
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256 if (isStarted())
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257 throw new IllegalStateException(STARTED);
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258
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259 Server old_server=getServer();
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260
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261 super.setServer(server);
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262
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263 Handler[] h=getHandlers();
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264 for (int i=0;h!=null && i<h.length;i++)
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265 h[i].setServer(server);
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266
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267 }
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268
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269 /* ------------------------------------------------------------ */
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270 /* Add a handler.
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271 * This implementation adds the passed handler to the end of the existing collection of handlers.
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272 * @see org.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.Handler)
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273 */
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274 public void addHandler(Handler handler)
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275 {
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276 setHandlers((Handler[])LazyList.addToArray(getHandlers(), handler, Handler.class));
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277 }
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278
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279 /* ------------------------------------------------------------ */
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280 public void removeHandler(Handler handler)
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281 {
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282 Handler[] handlers = getHandlers();
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283
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284 if (handlers!=null && handlers.length>0 )
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285 setHandlers((Handler[])LazyList.removeFromArray(handlers, handler));
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286 }
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287
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288 /* ------------------------------------------------------------ */
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289 @Override
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290 protected Object expandChildren(Object list, Class byClass)
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291 {
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292 Handler[] handlers = getHandlers();
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293 for (int i=0;handlers!=null && i<handlers.length;i++)
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294 list=expandHandler(handlers[i], list, byClass);
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295 return list;
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296 }
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297
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298 /* ------------------------------------------------------------ */
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299 @Override
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300 public void destroy()
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301 {
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302 if (!isStopped())
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303 throw new IllegalStateException("!STOPPED");
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304 Handler[] children=getChildHandlers();
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305 setHandlers(null);
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306 for (Handler child: children)
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307 child.destroy();
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308 super.destroy();
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309 }
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310 }