| /* |
| * Copyright (c) 2008, 2009, 2011, 2012 Eike Stepper (Berlin, Germany) 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: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.concurrent; |
| |
| import org.eclipse.net4j.util.WrappedException; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public final class ResultSynchronizer<RESULT> implements ISynchronizer<RESULT> |
| { |
| private RESULT result; |
| |
| private Object consumerLock = new Object(); |
| |
| private CountDownLatch producerLatch = new CountDownLatch(1); |
| |
| public ResultSynchronizer() |
| { |
| } |
| |
| public RESULT get(long timeout) |
| { |
| try |
| { |
| final long stop = System.currentTimeMillis() + timeout; |
| synchronized (consumerLock) |
| { |
| while (result == null) |
| { |
| try |
| { |
| final long remaining = stop - System.currentTimeMillis(); |
| if (remaining <= 0) |
| { |
| return null; |
| } |
| |
| consumerLock.wait(Math.min(remaining, 100L)); |
| } |
| catch (InterruptedException ex) |
| { |
| throw WrappedException.wrap(ex); |
| } |
| } |
| |
| return result; |
| } |
| } |
| finally |
| { |
| producerLatch.countDown(); |
| } |
| } |
| |
| public void put(RESULT result) |
| { |
| synchronized (consumerLock) |
| { |
| this.result = result; |
| consumerLock.notifyAll(); |
| } |
| } |
| |
| public boolean put(RESULT result, long timeout) |
| { |
| synchronized (consumerLock) |
| { |
| this.result = result; |
| consumerLock.notifyAll(); |
| } |
| |
| try |
| { |
| if (!producerLatch.await(timeout, TimeUnit.MILLISECONDS)) |
| { |
| return false; |
| } |
| } |
| catch (InterruptedException ex) |
| { |
| return false; |
| } |
| |
| return true; |
| } |
| } |