com.sun.jts.CosTransactions.EventSemaphore Maven / Gradle / Ivy
Show all versions of payara-client Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2015 Oracle and/or its affiliates. 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_1_1.html
* or packager/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 packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [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.
*/
// Portions Copyright [2016-2021] [Payara Foundation]
//----------------------------------------------------------------------------
//
// 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.
*
* @version 0.01
*
* @author Simon Holdsworth, IBM Corporation
*
* @see
*/
//----------------------------------------------------------------------------
// CHANGE HISTORY
//
// Version By Change Description
// 0.01 SAJH Initial implementation.
//-----------------------------------------------------------------------------
public class EventSemaphore {
boolean posted = false;
/**Default EventSemaphore constructor.
*
* @param
*
* @return
*
* @see
*/
EventSemaphore() {
}
/**
* @return true if semaphore has already been posted.
*/
synchronized public boolean isPosted() {
return posted;
}
/**Waits for the event to be posted.
*
* If the event has already been posted, then the operation returns immediately.
*
* @param
*
* @return
*
* @exception InterruptedException The wait was interrupted.
*
* @see
*/
synchronized public void waitEvent()
throws InterruptedException {
if( !posted )
wait();
}
/**Waits for the event to be posted. Release the thread waiting after the CMT
* Timeout period if no event has been posted during this timeout interval.
*
* If the event has already been posted, then the operation returns immediately.
*
* @param cmtTimeout - container managed transaction timeout
*
* @return
*
* @exception InterruptedException The wait was interrupted.
*
* @see
*/
synchronized public void waitTimeoutEvent(int cmtTimeout)
throws InterruptedException {
if (!posted) {
long timeout = (System.currentTimeMillis() / 1000) + cmtTimeout;
while (!posted && timeout - (System.currentTimeMillis() / 1000) > 0) {
wait(timeout - (System.currentTimeMillis() / 1000));
}
}
}
/**Posts the event semaphore.
*
* All waiters are notified.
*
* @param
*
* @return
*
* @see
*/
synchronized void post() {
if( !posted )
notifyAll();
posted = true;
}
}