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1   //========================================================================
2   //$Id: ContinuationSupport.java,v 1.1 2005/11/14 17:45:56 gregwilkins Exp $
3   //Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
4   //------------------------------------------------------------------------
5   //Licensed under the Apache License, Version 2.0 (the "License");
6   //you may not use this file except in compliance with the License.
7   //You may obtain a copy of the License at 
8   //http://www.apache.org/licenses/LICENSE-2.0
9   //Unless required by applicable law or agreed to in writing, software
10  //distributed under the License is distributed on an "AS IS" BASIS,
11  //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  //See the License for the specific language governing permissions and
13  //limitations under the License.
14  //========================================================================
15  
16  package org.mortbay.util.ajax;
17  
18  import javax.servlet.http.HttpServletRequest;
19  
20  /* ------------------------------------------------------------ */
21  /** ContinuationSupport.
22   * Conveniance class to avoid classloading visibility issues.
23   * @author gregw
24   *
25   */
26  public class ContinuationSupport
27  {
28      public static Continuation getContinuation(HttpServletRequest request, Object lock)
29      {
30          Continuation continuation = (Continuation) request.getAttribute("org.mortbay.jetty.ajax.Continuation");
31          if (continuation==null)
32              continuation=new WaitingContinuation(lock);
33          else if (continuation instanceof WaitingContinuation  && lock!=null)
34              ((WaitingContinuation)continuation).setMutex(lock);
35          return continuation;
36      }
37  }