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.runtime.common.utils;
020
021import org.apache.reef.wake.EventHandler;
022
023import java.util.ArrayList;
024import java.util.Collection;
025import java.util.List;
026
027/**
028 * Handler for BroadCastEvent which sends event to all handlers in the list.
029 */
030public class BroadCastEventHandler<E> implements EventHandler<E> {
031  private final List<EventHandler<E>> handlers;
032
033  public BroadCastEventHandler(final Collection<EventHandler<E>> handlers) {
034    this.handlers = new ArrayList<>(handlers);
035  }
036
037  @Override
038  public void onNext(final E event) {
039    for (final EventHandler<E> handler : handlers) {
040      handler.onNext(event);
041    }
042  }
043
044  public void addEventHandler(final EventHandler<E> eventHandler) {
045    this.handlers.add(eventHandler);
046  }
047
048}