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annotate src/org/eclipse/jetty/continuation/ContinuationSupport.java @ 862:2bb375e94f64

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simplify jetty.util.IO
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 02 Oct 2016 05:17:11 -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.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 /* ------------------------------------------------------------ */
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36 /**
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37 * Get a Continuation. The type of the Continuation returned may
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38 * vary depending on the container in which the application is
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39 * deployed. It may be an implementation native to the container (eg
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40 * org.eclipse.jetty.server.AsyncContinuation) or one of the utility
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41 * implementations provided such as an internal <code>FauxContinuation</code>
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42 * or a real implementation like {@link org.eclipse.jetty.continuation.Servlet3Continuation}.
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43 * @param request The request
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44 * @return a Continuation instance
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45 */
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46 public static Continuation getContinuation(ServletRequest request)
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47 {
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48 Continuation continuation = (Continuation) request.getAttribute(Continuation.ATTRIBUTE);
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49 if (continuation!=null)
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50 return continuation;
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51
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52 throw new IllegalStateException("!(Jetty || Servlet 3.0 || ContinuationFilter)");
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53 }
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54 }