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annotate src/org/eclipse/jetty/continuation/ContinuationSupport.java @ 805:fc3e366caa51

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add jetty-dir.css
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 22:46:38 -0600
parents 3428c60d7cfc
children dfa742c663f9
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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.continuation;
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20
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21 import java.lang.reflect.Constructor;
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22 import javax.servlet.ServletRequest;
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23 import javax.servlet.ServletRequestWrapper;
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24 import javax.servlet.ServletResponse;
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25
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26 /* ------------------------------------------------------------ */
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27 /** ContinuationSupport.
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28 *
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29 * Factory class for accessing Continuation instances, which with either be
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30 * native to the container (jetty >= 6), a servlet 3.0 or a faux continuation.
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31 *
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32 */
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33 public class ContinuationSupport
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34 {
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35 static final boolean __jetty6;
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36 static final boolean __servlet3;
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37 static final Class<?> __waitingContinuation;
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38 static final Constructor<? extends Continuation> __newServlet3Continuation;
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39 static final Constructor<? extends Continuation> __newJetty6Continuation;
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40 static
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41 {
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42 boolean servlet3Support=false;
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43 Constructor<? extends Continuation>s3cc=null;
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44 try
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45 {
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46 boolean servlet3=ServletRequest.class.getMethod("startAsync")!=null;
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47 if (servlet3)
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48 {
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49 Class<? extends Continuation> s3c = ContinuationSupport.class.getClassLoader().loadClass("org.eclipse.jetty.continuation.Servlet3Continuation").asSubclass(Continuation.class);
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50 s3cc=s3c.getConstructor(ServletRequest.class);
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51 servlet3Support=true;
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52 }
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53 }
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54 catch (Exception e)
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55 {}
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56 finally
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57 {
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58 __servlet3=servlet3Support;
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59 __newServlet3Continuation=s3cc;
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60 }
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61
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62 boolean jetty6Support=false;
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63 Constructor<? extends Continuation>j6cc=null;
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64 try
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65 {
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66 Class<?> jetty6ContinuationClass = ContinuationSupport.class.getClassLoader().loadClass("org.mortbay.util.ajax.Continuation");
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67 boolean jetty6=jetty6ContinuationClass!=null;
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68 if (jetty6)
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69 {
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70 Class<? extends Continuation> j6c = ContinuationSupport.class.getClassLoader().loadClass("org.eclipse.jetty.continuation.Jetty6Continuation").asSubclass(Continuation.class);
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71 j6cc=j6c.getConstructor(ServletRequest.class, jetty6ContinuationClass);
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72 jetty6Support=true;
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73 }
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74 }
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75 catch (Exception e)
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76 {}
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77 finally
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78 {
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79 __jetty6=jetty6Support;
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80 __newJetty6Continuation=j6cc;
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81 }
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82
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83 Class<?> waiting=null;
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84 try
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85 {
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86 waiting=ContinuationSupport.class.getClassLoader().loadClass("org.mortbay.util.ajax.WaitingContinuation");
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87 }
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88 catch (Exception e)
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89 {
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90 }
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91 finally
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92 {
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93 __waitingContinuation=waiting;
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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 * Get a Continuation. The type of the Continuation returned may
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100 * vary depending on the container in which the application is
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101 * deployed. It may be an implementation native to the container (eg
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102 * org.eclipse.jetty.server.AsyncContinuation) or one of the utility
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103 * implementations provided such as an internal <code>FauxContinuation</code>
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104 * or a real implementation like {@link org.eclipse.jetty.continuation.Servlet3Continuation}.
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105 * @param request The request
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106 * @return a Continuation instance
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107 */
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108 public static Continuation getContinuation(ServletRequest request)
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109 {
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110 Continuation continuation = (Continuation) request.getAttribute(Continuation.ATTRIBUTE);
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111 if (continuation!=null)
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112 return continuation;
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113
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114 while (request instanceof ServletRequestWrapper)
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115 request=((ServletRequestWrapper)request).getRequest();
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116
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117 if (__servlet3 )
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118 {
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119 try
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120 {
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121 continuation=__newServlet3Continuation.newInstance(request);
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122 request.setAttribute(Continuation.ATTRIBUTE,continuation);
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123 return continuation;
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124 }
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125 catch(Exception e)
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126 {
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127 throw new RuntimeException(e);
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128 }
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129 }
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130
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131 if (__jetty6)
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132 {
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133 Object c=request.getAttribute("org.mortbay.jetty.ajax.Continuation");
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134 try
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135 {
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136 if (c==null || __waitingContinuation==null || __waitingContinuation.isInstance(c))
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137 continuation=new FauxContinuation(request);
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138 else
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139 continuation= __newJetty6Continuation.newInstance(request,c);
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140 request.setAttribute(Continuation.ATTRIBUTE,continuation);
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141 return continuation;
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142 }
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143 catch(Exception e)
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144 {
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145 throw new RuntimeException(e);
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146 }
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147 }
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148
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149 throw new IllegalStateException("!(Jetty || Servlet 3.0 || ContinuationFilter)");
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150 }
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151
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152 /* ------------------------------------------------------------ */
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153 /**
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154 * @param request the servlet request
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155 * @param response the servlet response
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156 * @deprecated use {@link #getContinuation(ServletRequest)}
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157 * @return the continuation
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158 */
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159 @Deprecated
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160 public static Continuation getContinuation(final ServletRequest request, final ServletResponse response)
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161 {
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162 return getContinuation(request);
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163 }
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164 }