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annotate src/org/eclipse/jetty/continuation/ContinuationFilter.java @ 825:7fb7c1915788

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remove jetty.util.B64Code
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 14 Sep 2016 16:38:33 -0600
parents 3428c60d7cfc
children
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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 }