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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   * 
   * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
   * 
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License. You can obtain
  * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
  * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  * 
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
  * Sun designates this particular file as subject to the "Classpath" exception
  * as provided by Sun in the GPL Version 2 section of the License file that
  * accompanied this code.  If applicable, add the following below the License
  * Header, with the fields enclosed by brackets [] replaced by your own
  * identifying information: "Portions Copyrighted [year]
  * [name of copyright owner]"
  * 
  * Contributor(s):
  * 
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
 
 /*
  * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 //----------------------------------------------------------------------------
 //
 // Module:      EventSemaphore.java
 //
 // Description: Event semaphore implementation.
 //
 // Product:     com.sun.jts.CosTransactions
 //
 // Author:      Simon Holdsworth
 //
 // Date:        March, 1997
 //
 // Copyright (c):   1995-1997 IBM Corp.
 //
 //   The source code for this program is not published or otherwise divested
 //   of its trade secrets, irrespective of what has been deposited with the
 //   U.S. Copyright Office.
 //
 //   This software contains confidential and proprietary information of
 //   IBM Corp.
 //----------------------------------------------------------------------------
 
 package com.sun.jts.CosTransactions;

The EventSemaphore interface provides operations that wait for and post an event semaphore.

This is specifically to handle the situation where the event may have been posted before the wait method is called. This behaviour is not supported by the existing wait and notify methods.

Author(s):
Simon Holdsworth, IBM Corporation
Version:
0.01
See also:
 
 //----------------------------------------------------------------------------
 // CHANGE HISTORY
 //
 // Version By     Change Description
 //   0.01  SAJH   Initial implementation.
 //-----------------------------------------------------------------------------
 
 public class EventSemaphore {
     boolean posted = false;

    
Default EventSemaphore constructor.

Parameters:
Returns:
See also:
 
     EventSemaphore() {
     }

    
Creates the event semaphore in the given posted state.

Parameters:
posted Indicates whether the semaphore should be posted.
Returns:
See also:
    EventSemaphoreboolean posted ) {
        this. = posted;
    }

    

Returns:
true if semaphore has already been posted.
    synchronized public boolean isPosted() {
        return ;
    }

    
Waits for the event to be posted.

If the event has already been posted, then the operation returns immediately.

Parameters:
Returns:
Throws:
java.lang.InterruptedException The wait was interrupted.
See also:
    synchronized public void waitEvent()
        throws InterruptedException {
        if( ! )
            wait();
    }

    
Posts the event semaphore.

All waiters are notified.

Parameters:
Returns:
See also:
    synchronized void post() {
        if( ! )
            notifyAll();
         = true;
    }

    
Clears a posted event semaphore.

Parameters:
Returns:
See also:
    synchronized void clear() {
         = false;
    }
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