Mercurial Hosting > luan
annotate src/org/eclipse/jetty/continuation/ContinuationSupport.java @ 821:292f2e31ab41
remove ErrorHandler.ErrorPageMapper
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 14 Sep 2016 00:48:03 -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 } |