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annotate src/org/eclipse/jetty/continuation/Continuation.java @ 857:c20e2a4908d1

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author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 21 Sep 2016 14:54:44 -0600
parents 3428c60d7cfc
children 1fc8ee20cb18
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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 javax.servlet.Filter;
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22 import javax.servlet.FilterChain;
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23 import javax.servlet.Servlet;
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24 import javax.servlet.ServletRequest;
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25 import javax.servlet.ServletResponse;
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26 import javax.servlet.ServletResponseWrapper;
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27
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28 /* ------------------------------------------------------------ */
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29 /**
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30 * Continuation.
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31 *
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32 * A continuation is a mechanism by which a HTTP Request can be suspended and
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33 * restarted after a timeout or an asynchronous event has occurred.
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34 * <p>
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35 * The continuation mechanism is a portable mechanism that will work
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36 * asynchronously without additional configuration of all jetty-7,
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37 * jetty-8 and Servlet 3.0 containers. With the addition of
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38 * the {@link ContinuationFilter}, the mechanism will also work
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39 * asynchronously on jetty-6 and non-asynchronously on any
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40 * servlet 2.5 container.
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41 * <p>
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42 * The Continuation API is a simplification of the richer async API
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43 * provided by the servlet-3.0 and an enhancement of the continuation
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44 * API that was introduced with jetty-6.
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45 * </p>
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46 * <h1>Continuation Usage</h1>
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47 * <p>
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48 * A continuation object is obtained for a request by calling the
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49 * factory method {@link ContinuationSupport#getContinuation(ServletRequest)}.
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50 * The continuation type returned will depend on the servlet container
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51 * being used.
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52 * </p>
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53 * <p>
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54 * There are two distinct style of operation of the continuation API.
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55 * </p>
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56 * <h3>Suspend/Resume Usage</h3>
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57 * <p>The suspend/resume style is used when a servlet and/or
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58 * filter is used to generate the response after a asynchronous wait that is
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59 * terminated by an asynchronous handler.
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60 * </p>
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61 * <pre>
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62 * <b>Filter/Servlet:</b>
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63 * // if we need to get asynchronous results
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64 * Object results = request.getAttribute("results);
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65 * if (results==null)
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66 * {
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67 * Continuation continuation = ContinuationSupport.getContinuation(request);
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68 * continuation.suspend();
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69 * myAsyncHandler.register(continuation);
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70 * return; // or continuation.undispatch();
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71 * }
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72 *
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73 * async wait ...
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74 *
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75 * <b>Async Handler:</b>
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76 * // when the waited for event happens
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77 * continuation.setAttribute("results",event);
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78 * continuation.resume();
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79 *
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80 * <b>Filter/Servlet:</b>
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81 * // when the request is redispatched
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82 * if (results==null)
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83 * {
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84 * ... // see above
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85 * }
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86 * else
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87 * {
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88 * response.getOutputStream().write(process(results));
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89 * }
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90 * </pre>
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91 * <h3>Suspend/Complete Usage</h3>
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92 * <p>
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93 * The suspend/complete style is used when an asynchronous handler is used to
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94 * generate the response:
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95 * </p>
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96 * <pre>
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97 * <b>Filter/Servlet:</b>
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98 * // when we want to enter asynchronous mode
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99 * Continuation continuation = ContinuationSupport.getContinuation(request);
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100 * continuation.suspend(response); // response may be wrapped
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101 * myAsyncHandler.register(continuation);
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102 * return; // or continuation.undispatch();
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103 *
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104 * <b>Wrapping Filter:</b>
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105 * // any filter that had wrapped the response should be implemented like:
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106 * try
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107 * {
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108 * chain.doFilter(request,wrappedResponse);
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109 * }
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110 * finally
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111 * {
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112 * if (!continuation.isResponseWrapped())
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113 * wrappedResponse.finish()
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114 * else
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115 * continuation.addContinuationListener(myCompleteListener)
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116 * }
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117 *
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118 * async wait ...
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119 *
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120 * <b>Async Handler:</b>
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121 * // when the async event happens
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122 * continuation.getServletResponse().getOutputStream().write(process(event));
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123 * continuation.complete()
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124 * </pre>
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125 *
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126 * <h1>Continuation Timeout</h1>
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127 * <p>
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128 * If a continuation is suspended, but neither {@link #complete()} or {@link #resume()} is
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129 * called during the period set by {@link #setTimeout(long)}, then the continuation will
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130 * expire and {@link #isExpired()} will return true.
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131 * </p>
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132 * <p>
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133 * When a continuation expires, the {@link ContinuationListener#onTimeout(Continuation)}
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134 * method is called on any {@link ContinuationListener} that has been registered via the
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135 * {@link #addContinuationListener(ContinuationListener)} method. The onTimeout handlers
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136 * may write a response and call {@link #complete()}. If {@link #complete()} is not called,
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137 * then the container will redispatch the request as if {@link #resume()} had been called,
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138 * except that {@link #isExpired()} will be true and {@link #isResumed()} will be false.
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139 * </p>
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140 *
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141 * @see ContinuationSupport
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142 * @see ContinuationListener
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143 *
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144 */
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145 public interface Continuation
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146 {
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147 public final static String ATTRIBUTE = "org.eclipse.jetty.continuation";
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148
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149 /* ------------------------------------------------------------ */
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150 /**
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151 * Set the continuation timeout.
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152 *
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153 * @param timeoutMs
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154 * The time in milliseconds to wait before expiring this
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155 * continuation after a call to {@link #suspend()} or {@link #suspend(ServletResponse)}.
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156 * A timeout of <=0 means the continuation will never expire.
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157 */
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158 void setTimeout(long timeoutMs);
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159
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160 /* ------------------------------------------------------------ */
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161 /**
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162 * Suspend the processing of the request and associated
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163 * {@link ServletResponse}.
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164 *
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165 * <p>
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166 * After this method has been called, the lifecycle of the request will be
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167 * extended beyond the return to the container from the
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168 * {@link Servlet#service(ServletRequest, ServletResponse)} method and
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169 * {@link Filter#doFilter(ServletRequest, ServletResponse, FilterChain)}
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170 * calls. When a suspended request is returned to the container after
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171 * a dispatch, then the container will not commit the associated response
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172 * (unless an exception other than {@link ContinuationThrowable} is thrown).
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173 * </p>
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174 *
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175 * <p>
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176 * When the thread calling the filter chain and/or servlet has returned to
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177 * the container with a suspended request, the thread is freed for other
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178 * tasks and the request is held until either:
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179 * <ul>
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180 * <li>a call to {@link #resume()}.</li>
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181 * <li>a call to {@link #complete()}.</li>
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182 * <li>the timeout expires.</li>
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183 * </ul>
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184 * <p>
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185 * Typically suspend with no arguments is uses when a call to {@link #resume()}
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186 * is expected. If a call to {@link #complete()} is expected, then the
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187 * {@link #suspend(ServletResponse)} method should be used instead of this method.
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188 * </p>
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189 *
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190 * @exception IllegalStateException
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191 * If the request cannot be suspended
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192 */
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193 void suspend();
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194
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195
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196 /* ------------------------------------------------------------ */
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197 /**
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198 * Suspend the processing of the request and associated
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199 * {@link ServletResponse}.
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200 *
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201 * <p>
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202 * After this method has been called, the lifecycle of the request will be
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203 * extended beyond the return to the container from the
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204 * {@link Servlet#service(ServletRequest, ServletResponse)} method and
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205 * {@link Filter#doFilter(ServletRequest, ServletResponse, FilterChain)}
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206 * calls. When a suspended request is returned to the container after
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207 * a dispatch, then the container will not commit the associated response
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208 * (unless an exception other than {@link ContinuationThrowable} is thrown).
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209 * </p>
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210 * <p>
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211 * When the thread calling the filter chain and/or servlet has returned to
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212 * the container with a suspended request, the thread is freed for other
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213 * tasks and the request is held until either:
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214 * <ul>
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215 * <li>a call to {@link #resume()}.</li>
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216 * <li>a call to {@link #complete()}.</li>
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217 * <li>the timeout expires.</li>
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218 * </ul>
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219 * <p>
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220 * Typically suspend with a response argument is uses when a call to {@link #complete()}
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221 * is expected. If a call to {@link #resume()} is expected, then the
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222 * {@link #suspend()} method should be used instead of this method.
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223 * </p>
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224 * <p>
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225 * Filters that may wrap the response object should check {@link #isResponseWrapped()}
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226 * to decide if they should destroy/finish the wrapper. If {@link #isResponseWrapped()}
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227 * returns true, then the wrapped request has been passed to the asynchronous
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228 * handler and the wrapper should not be destroyed/finished until after a call to
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229 * {@link #complete()} (potentially using a {@link ContinuationListener#onComplete(Continuation)}
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230 * listener).
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231 *
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232 * @param response The response to return via a call to {@link #getServletResponse()}
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233 * @exception IllegalStateException
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234 * If the request cannot be suspended
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235 */
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236 void suspend(ServletResponse response);
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237
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238 /* ------------------------------------------------------------ */
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239 /**
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240 * Resume a suspended request.
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241 *
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242 * <p>
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243 * This method can be called by any thread that has been passed a reference
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244 * to a continuation. When called the request is redispatched to the
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245 * normal filter chain and servlet processing with {@link #isInitial()} false.
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246 * </p>
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247 * <p>
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248 * If resume is called before a suspended request is returned to the
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249 * container (ie the thread that called {@link #suspend()} is still
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250 * within the filter chain and/or servlet service method), then the resume
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251 * does not take effect until the call to the filter chain and/or servlet
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252 * returns to the container. In this case both {@link #isSuspended()} and
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253 * {@link #isResumed()} return true. Multiple calls to resume are ignored.
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254 * </p>
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255 * <p>
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256 * Typically resume() is used after a call to {@link #suspend()} with
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257 * no arguments. The dispatch after a resume call will use the original
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258 * request and response objects, even if {@link #suspend(ServletResponse)}
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259 * had been passed a wrapped response.
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260 * </p>
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261 *
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262 * @see #suspend()
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263 * @exception IllegalStateException if the request is not suspended.
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264 *
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265 */
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266 void resume();
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267
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268 /* ------------------------------------------------------------ */
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269 /**
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270 * Complete a suspended request.
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271 *
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272 * <p>
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273 * This method can be called by any thread that has been passed a reference
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274 * to a suspended request. When a request is completed, the associated
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275 * response object committed and flushed. The request is not redispatched.
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276 * </p>
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277 *
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278 * <p>
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279 * If complete is called before a suspended request is returned to the
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280 * container (ie the thread that called {@link #suspend()} is still
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281 * within the filter chain and/or servlet service method), then the complete
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282 * does not take effect until the call to the filter chain and/or servlet
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283 * returns to the container. In this case both {@link #isSuspended()} and
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284 * {@link #isResumed()} return true.
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285 * </p>
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286 *
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287 * <p>
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288 * Typically resume() is used after a call to {@link #suspend(ServletResponse)} with
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289 * a possibly wrapped response. The async handler should use the response
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290 * provided by {@link #getServletResponse()} to write the response before
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291 * calling {@link #complete()}. If the request was suspended with a
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292 * call to {@link #suspend()} then no response object will be available via
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293 * {@link #getServletResponse()}.
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294 * </p>
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295 *
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296 * <p>
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297 * Once complete has been called and any thread calling the filter chain
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298 * and/or servlet chain has returned to the container, the request lifecycle
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299 * is complete. The container is able to recycle request objects, so it is
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300 * not valid hold a request or continuation reference after the end of the
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301 * life cycle.
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302 *
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303 * @see #suspend()
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304 * @exception IllegalStateException
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305 * if the request is not suspended.
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306 *
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307 */
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308 void complete();
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309
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310 /* ------------------------------------------------------------ */
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311 /**
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312 * @return true after {@link #suspend()} has been called and before the
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313 * request has been redispatched due to being resumed, completed or
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314 * timed out.
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315 */
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316 boolean isSuspended();
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317
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318 /* ------------------------------------------------------------ */
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319 /**
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320 * @return true if the request has been redispatched by a call to
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321 * {@link #resume()}. Returns false after any subsequent call to
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322 * suspend
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323 */
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324 boolean isResumed();
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325
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326 /* ------------------------------------------------------------ */
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327 /**
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328 * @return true after a request has been redispatched as the result of a
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329 * timeout. Returns false after any subsequent call to suspend.
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330 */
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331 boolean isExpired();
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332
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333 /* ------------------------------------------------------------ */
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334 /**
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335 * @return true while the request is within the initial dispatch to the
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336 * filter chain and/or servlet. Will return false once the calling
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337 * thread has returned to the container after suspend has been
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338 * called and during any subsequent redispatch.
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339 */
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340 boolean isInitial();
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341
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342 /* ------------------------------------------------------------ */
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343 /**
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344 * Is the suspended response wrapped.
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345 * <p>
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346 * Filters that wrap the response object should check this method to
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347 * determine if they should destroy/finish the wrapped response. If
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348 * the request was suspended with a call to {@link #suspend(ServletResponse)}
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349 * that passed the wrapped response, then the filter should register
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350 * a {@link ContinuationListener} to destroy/finish the wrapped response
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351 * during a call to {@link ContinuationListener#onComplete(Continuation)}.
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352 * @return True if {@link #suspend(ServletResponse)} has been passed a
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353 * {@link ServletResponseWrapper} instance.
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354 */
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355 boolean isResponseWrapped();
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356
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357
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358 /* ------------------------------------------------------------ */
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359 /**
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360 * Get the suspended response.
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361 * @return the {@link ServletResponse} passed to {@link #suspend(ServletResponse)}.
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362 */
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363 ServletResponse getServletResponse();
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364
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365 /* ------------------------------------------------------------ */
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366 /**
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367 * Add a ContinuationListener.
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368 *
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369 * @param listener
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370 */
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371 void addContinuationListener(ContinuationListener listener);
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372
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373 /* ------------------------------------------------------------ */
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374 /** Set a request attribute.
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375 * This method is a convenience method to call the {@link ServletRequest#setAttribute(String, Object)}
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376 * method on the associated request object.
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377 * This is a thread safe call and may be called by any thread.
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378 * @param name the attribute name
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379 * @param attribute the attribute value
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380 */
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381 public void setAttribute(String name, Object attribute);
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382
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383 /* ------------------------------------------------------------ */
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384 /** Get a request attribute.
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385 * This method is a convenience method to call the {@link ServletRequest#getAttribute(String)}
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386 * method on the associated request object.
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387 * This is a thread safe call and may be called by any thread.
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388 * @param name the attribute name
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389 * @return the attribute value
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390 */
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391 public Object getAttribute(String name);
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392
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393 /* ------------------------------------------------------------ */
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394 /** Remove a request attribute.
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395 * This method is a convenience method to call the {@link ServletRequest#removeAttribute(String)}
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396 * method on the associated request object.
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397 * This is a thread safe call and may be called by any thread.
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398 * @param name the attribute name
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399 */
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400 public void removeAttribute(String name);
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401
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402 /* ------------------------------------------------------------ */
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403 /**
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404 * Undispatch the request.
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405 * <p>
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406 * This method can be called on a suspended continuation in order
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407 * to exit the dispatch to the filter/servlet by throwing a {@link ContinuationThrowable}
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408 * which is caught either by the container or the {@link ContinuationFilter}.
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409 * This is an alternative to simply returning from the dispatch in the case
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410 * where filters in the filter chain may not be prepared to handle a suspended
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411 * request.
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412 * </p>
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413 * This method should only be used as a last resort and a normal return is a prefereable
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414 * solution if filters can be updated to handle that case.
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415 *
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416 * @throws ContinuationThrowable thrown if the request is suspended. The instance of the
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417 * exception may be reused on subsequent calls, so the stack frame may not be accurate.
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418 */
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419 public void undispatch() throws ContinuationThrowable;
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420 }