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/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 **********************************************************************************************************************/

package eu.stratosphere.pact.runtime.iterative.concurrent;

import java.util.concurrent.CountDownLatch;

/**
 * Resettable barrier to synchronize {@link IterationHeadPactTask} and {@link IterationTailPactTask} in case of
 * iterations that contain a separate solution set tail.
 */
public class SolutionSetUpdateBarrier {

	private CountDownLatch latch;

	public void setup() {
		latch = new CountDownLatch(1);
	}

	/**
	 * Waits (blocking) on barrier.
	 *
	 * @throws InterruptedException
	 */
	public void waitForSolutionSetUpdate() throws InterruptedException {
		latch.await();
	}

	/**
	 * Releases the waiting thread.
	 */
	public void notifySolutionSetUpdate() {
		latch.countDown();
	}
}