1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.combiner; 20 21 import org.apache.hadoop.io.IntWritable; 22 import org.apache.hadoop.io.WritableComparable; 23 24 /** 25 * {@link MessageCombiner} that finds the minimum {@link IntWritable} 26 */ 27 public class MinimumIntMessageCombiner 28 implements MessageCombiner<WritableComparable, IntWritable> { 29 @Override 30 public void combine(WritableComparable vertexIndex, 31 IntWritable originalMessage, IntWritable messageToCombine) { 32 if (originalMessage.get() > messageToCombine.get()) { 33 originalMessage.set(messageToCombine.get()); 34 } 35 } 36 37 @Override 38 public IntWritable createInitialMessage() { 39 return new IntWritable(Integer.MAX_VALUE); 40 } 41 }