| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.giraph.function; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Allows multiple Consumers to be combined into a single Consumer, by having |
| * them all subscribe to this object, and then using this object as a group |
| * Consumer. |
| * |
| * @param <T> Argument type |
| */ |
| public class ObjectNotifier<T> implements Consumer<T>, Notifier<T> { |
| /** List of subscribers */ |
| private final List<Consumer<T>> subscribers = new ArrayList<>(); |
| |
| @Override |
| public void apply(T value) { |
| for (Consumer<T> consumer : subscribers) { |
| consumer.apply(value); |
| } |
| } |
| |
| @Override |
| public void subscribe(Consumer<T> consumer) { |
| subscribers.add(consumer); |
| } |
| |
| @Override |
| public String toString() { |
| return getClass() + " [subscribers=" + subscribers + "]"; |
| } |
| } |