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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  }