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// Portions Copyright [2016] [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() {
}
/**Creates the event semaphore in the given posted state.
*
* @param posted Indicates whether the semaphore should be posted.
*
* @return
*
* @see
*/
EventSemaphore( boolean posted ) {
this.posted = posted;
}
/**
* @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;
}
/**Clears a posted event semaphore.
*
* @param
*
* @return
*
* @see
*/
synchronized void clear() {
posted = false;
}
}