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annotate src/org/eclipse/jetty/continuation/ContinuationFilter.java @ 825:7fb7c1915788
remove jetty.util.B64Code
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 14 Sep 2016 16:38:33 -0600 |
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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.io.IOException; |
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22 |
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23 import javax.servlet.Filter; |
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24 import javax.servlet.FilterChain; |
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25 import javax.servlet.FilterConfig; |
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26 import javax.servlet.ServletContext; |
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27 import javax.servlet.ServletException; |
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28 import javax.servlet.ServletRequest; |
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29 import javax.servlet.ServletResponse; |
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30 |
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31 |
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32 |
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33 /* ------------------------------------------------------------ */ |
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34 /** |
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35 * <p>ContinuationFilter must be applied to servlet paths that make use of |
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36 * the asynchronous features provided by {@link Continuation} APIs, but that |
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37 * are deployed in servlet containers that are neither Jetty (>= 7) nor a |
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38 * compliant Servlet 3.0 container.</p> |
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39 * <p>The following init parameters may be used to configure the filter (these are mostly for testing):</p> |
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40 * <dl> |
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41 * <dt>debug</dt><dd>Boolean controlling debug output</dd> |
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42 * <dt>jetty6</dt><dd>Boolean to force use of Jetty 6 continuations</dd> |
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43 * <dt>faux</dt><dd>Boolean to force use of faux continuations</dd> |
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44 * </dl> |
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45 * <p>If the servlet container is not Jetty (either 6 or 7) nor a Servlet 3 |
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46 * container, then "faux" continuations will be used.</p> |
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47 * <p>Faux continuations will just put the thread that called {@link Continuation#suspend()} |
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48 * in wait, and will notify that thread when {@link Continuation#resume()} or |
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49 * {@link Continuation#complete()} is called.</p> |
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50 * <p>Faux continuations are not threadless continuations (they are "faux" - fake - for this reason) |
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51 * and as such they will scale less than proper continuations.</p> |
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52 */ |
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53 public class ContinuationFilter implements Filter |
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54 { |
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55 static boolean _initialized; |
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56 static boolean __debug; // shared debug status |
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57 private boolean _faux; |
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58 private boolean _jetty6; |
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59 private boolean _filtered; |
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60 ServletContext _context; |
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61 private boolean _debug; |
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62 |
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63 public void init(FilterConfig filterConfig) throws ServletException |
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64 { |
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65 boolean jetty_7_or_greater="org.eclipse.jetty.servlet".equals(filterConfig.getClass().getPackage().getName()); |
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66 _context = filterConfig.getServletContext(); |
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67 |
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68 String param=filterConfig.getInitParameter("debug"); |
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69 _debug=param!=null&&Boolean.parseBoolean(param); |
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70 if (_debug) |
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71 __debug=true; |
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72 |
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73 param=filterConfig.getInitParameter("jetty6"); |
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74 if (param==null) |
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75 param=filterConfig.getInitParameter("partial"); |
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76 if (param!=null) |
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77 _jetty6=Boolean.parseBoolean(param); |
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78 else |
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79 _jetty6=ContinuationSupport.__jetty6 && !jetty_7_or_greater; |
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80 |
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81 param=filterConfig.getInitParameter("faux"); |
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82 if (param!=null) |
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83 _faux=Boolean.parseBoolean(param); |
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84 else |
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85 _faux=!(jetty_7_or_greater || _jetty6 || _context.getMajorVersion()>=3); |
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86 |
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87 _filtered=_faux||_jetty6; |
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88 if (_debug) |
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89 _context.log("ContinuationFilter "+ |
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90 " jetty="+jetty_7_or_greater+ |
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91 " jetty6="+_jetty6+ |
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92 " faux="+_faux+ |
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93 " filtered="+_filtered+ |
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94 " servlet3="+ContinuationSupport.__servlet3); |
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95 _initialized=true; |
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96 } |
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97 |
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98 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException |
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99 { |
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100 if (_filtered) |
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101 { |
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102 Continuation c = (Continuation) request.getAttribute(Continuation.ATTRIBUTE); |
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103 FilteredContinuation fc; |
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104 if (_faux && (c==null || !(c instanceof FauxContinuation))) |
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105 { |
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106 fc = new FauxContinuation(request); |
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107 request.setAttribute(Continuation.ATTRIBUTE,fc); |
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108 } |
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109 else |
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110 fc=(FilteredContinuation)c; |
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111 |
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112 boolean complete=false; |
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113 while (!complete) |
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114 { |
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115 try |
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116 { |
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117 if (fc==null || (fc).enter(response)) |
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118 chain.doFilter(request,response); |
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119 } |
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120 catch (ContinuationThrowable e) |
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121 { |
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122 debug("faux",e); |
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123 } |
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124 finally |
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125 { |
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126 if (fc==null) |
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127 fc = (FilteredContinuation) request.getAttribute(Continuation.ATTRIBUTE); |
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128 |
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129 complete=fc==null || (fc).exit(); |
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130 } |
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131 } |
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132 } |
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133 else |
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134 { |
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135 try |
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136 { |
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137 chain.doFilter(request,response); |
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138 } |
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139 catch (ContinuationThrowable e) |
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140 { |
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141 debug("caught",e); |
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142 } |
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143 } |
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144 } |
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145 |
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146 private void debug(String string) |
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147 { |
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148 if (_debug) |
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149 { |
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150 _context.log(string); |
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151 } |
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152 } |
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153 |
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154 private void debug(String string, Throwable th) |
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155 { |
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156 if (_debug) |
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157 { |
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158 if (th instanceof ContinuationThrowable) |
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159 _context.log(string+":"+th); |
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160 else |
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161 _context.log(string,th); |
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162 } |
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163 } |
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164 |
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165 public void destroy() |
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166 { |
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167 } |
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168 |
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169 public interface FilteredContinuation extends Continuation |
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170 { |
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171 boolean enter(ServletResponse response); |
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172 boolean exit(); |
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173 } |
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174 } |