Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.network.group.impl.utils;
020
021import java.util.concurrent.CountDownLatch;
022
023public class ResettingCountDownLatch {
024  private CountDownLatch latch;
025
026  public ResettingCountDownLatch(final int initialCount) {
027    latch = new CountDownLatch(initialCount);
028  }
029
030  /**
031   *
032   */
033  public void await() {
034    try {
035      latch.await();
036    } catch (final InterruptedException e) {
037      throw new RuntimeException("InterruptedException while waiting for latch", e);
038    }
039  }
040
041  public void awaitAndReset(final int resetCount) {
042    try {
043      latch.await();
044      latch = new CountDownLatch(resetCount);
045    } catch (final InterruptedException e) {
046      throw new RuntimeException("InterruptedException while waiting for latch", e);
047    }
048  }
049
050  /**
051   *
052   */
053  public void countDown() {
054    latch.countDown();
055  }
056
057}