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/*******************************************************************************
* Copyright (c) 2011, 2015 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* William Chen (Wind River)- [345387]Open the remote files with a proper editor
*******************************************************************************/
package org.eclipse.tcf.te.tcf.core.concurrent;
import java.util.concurrent.TimeoutException;
/**
* A helper class used to synchronize producer and consumer threads. It is used
* to join a thread with its asynchronous call backs or listeners. Usually it is
* used in a case in which the thread have to wait for the end of an
* asynchronously called method.
* <p>
* The following is an example:
* <p>
*
* <pre>
* final Rendezvous rendezvous = new Rendezvous();
* service.open(path, IFileSystem.TCF_O_READ, null, new DoneOpen() {
* public void doneOpen(IToken token, FileSystemException error, IFileHandle hdl) {
* ...
* rendezvous.arrive();
* }
* });
* try{
* renderzvous.waiting(1000); //Waiting for 1 second.
* }catch(InterruptedException e){
* // Waiting has timed out.
* ...
* }
* </pre>
*
* The call renderzvous.waiting(1000) won't return until renderzvous.arrive() is
* called in the doneOpen(), or the waiting has timed out.
* <p>
* A rendezvous can be reused once it is reset:
* <p>
*
* <pre>
* renderzvous.reset();
* service.open(path, IFileSystem.TCF_O_READ, null, new DoneOpen() {
* public void doneOpen(IToken token, FileSystemException error, IFileHandle hdl) {
* ...
* rendezvous.arrive();
* }
* });
* try{
* renderzvous.waiting(2000); //Waiting for 2 seconds.
* }catch(InterruptedException e){
* // Waiting has timed out.
* ...
* }
* </pre>
*
*/
public class Rendezvous {
// Flag indicating if the other thread has arrived.
private boolean arrived;
/**
* Called to unblock the thread that is waiting on this rendezvous.
*/
public synchronized void arrive() {
arrived = true;
notifyAll();
}
/**
* Called to block the current thread until it is woken up by
* another thread or until it is timed out.
*
* @param timeout The timeout time.
* @throws TimeoutException The waiting has timed out.
*/
public synchronized void waiting(long timeout) throws TimeoutException {
long now = System.currentTimeMillis();
while (!arrived && (timeout <= 0 || System.currentTimeMillis() - now < timeout)) {
try {
wait(timeout);
} catch (InterruptedException e) {
}
}
if (!arrived)
throw new TimeoutException();
}
/**
* Called to block the current thread until it is woken up by another
* thread.
*/
public synchronized void waiting() throws TimeoutException {
waiting(0);
}
/**
* Reset the rendezvous so that it is reusable.
*/
public synchronized void reset() {
arrived = false;
}
}
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