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annotate src/org/eclipse/jetty/server/handler/HotSwapHandler.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
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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
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23 import javax.servlet.ServletException;
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24 import javax.servlet.http.HttpServletRequest;
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25 import javax.servlet.http.HttpServletResponse;
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26
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27 import org.eclipse.jetty.server.Handler;
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28 import org.eclipse.jetty.server.Request;
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29 import org.eclipse.jetty.server.Server;
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30
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31 /* ------------------------------------------------------------ */
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32 /**
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33 * A <code>HandlerContainer</code> that allows a hot swap of a wrapped handler.
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34 *
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35 */
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36 public class HotSwapHandler extends AbstractHandlerContainer
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37 {
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38 private volatile Handler _handler;
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39
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40 /* ------------------------------------------------------------ */
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41 /**
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42 *
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43 */
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44 public HotSwapHandler()
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45 {
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46 }
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47
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48 /* ------------------------------------------------------------ */
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49 /**
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50 * @return Returns the handlers.
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51 */
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52 public Handler getHandler()
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53 {
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54 return _handler;
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55 }
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56
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57 /* ------------------------------------------------------------ */
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58 /**
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59 * @return Returns the handlers.
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60 */
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61 public Handler[] getHandlers()
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62 {
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63 return new Handler[]
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64 { _handler };
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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 * @param handler
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70 * Set the {@link Handler} which should be wrapped.
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71 */
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72 public void setHandler(Handler handler)
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73 {
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74 if (handler == null)
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75 throw new IllegalArgumentException("Parameter handler is null.");
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76 try
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77 {
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78 Handler old_handler = _handler;
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79 _handler = handler;
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80 Server server = getServer();
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81 handler.setServer(server);
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82 addBean(handler);
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83
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84 // if there is an old handler and it was started, stop it
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85 if (old_handler != null)
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86 {
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87 removeBean(old_handler);
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88 }
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89
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90 }
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91 catch (Exception e)
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92 {
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93 throw new RuntimeException(e);
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94 }
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95 }
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96
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97 /* ------------------------------------------------------------ */
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98 /*
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99 * @see org.eclipse.thread.AbstractLifeCycle#doStart()
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100 */
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101 @Override
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102 protected void doStart() throws Exception
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103 {
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104 super.doStart();
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105 }
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106
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107 /* ------------------------------------------------------------ */
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108 /*
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109 * @see org.eclipse.thread.AbstractLifeCycle#doStop()
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110 */
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111 @Override
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112 protected void doStop() throws Exception
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113 {
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114 super.doStop();
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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 * @see org.eclipse.jetty.server.server.EventHandler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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120 */
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121 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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122 {
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123 if (_handler != null && isStarted())
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124 {
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125 _handler.handle(target,baseRequest,request,response);
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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 @Override
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131 public void setServer(Server server)
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132 {
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133 Server old_server = getServer();
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134 if (server == old_server)
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135 return;
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136
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137 if (isRunning())
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138 throw new IllegalStateException(RUNNING);
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139
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140 super.setServer(server);
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141
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142 Handler h = getHandler();
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143 if (h != null)
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144 h.setServer(server);
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145 }
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146
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147 /* ------------------------------------------------------------ */
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148 @SuppressWarnings(
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149 { "rawtypes", "unchecked" })
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150 @Override
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151 protected Object expandChildren(Object list, Class byClass)
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152 {
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153 return expandHandler(_handler,list,byClass);
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154 }
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155
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156 /* ------------------------------------------------------------ */
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157 @Override
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158 public void destroy()
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159 {
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160 if (!isStopped())
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161 throw new IllegalStateException("!STOPPED");
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162 Handler child = getHandler();
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163 if (child != null)
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164 {
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165 setHandler(null);
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166 child.destroy();
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167 }
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168 super.destroy();
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169 }
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170 }