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.comm.messages; 20 21 import org.apache.giraph.factories.MessageValueFactory; 22 import org.apache.giraph.utils.ExtendedDataInput; 23 import org.apache.giraph.utils.Factory; 24 import org.apache.giraph.utils.RepresentativeByteStructIterable; 25 import org.apache.hadoop.io.Writable; 26 27 /** 28 * Special iterable that recycles the message 29 * 30 * @param <M> Message data 31 */ 32 public class MessagesIterable<M extends Writable> 33 extends RepresentativeByteStructIterable<M> { 34 /** Message class */ 35 private final MessageValueFactory<M> messageValueFactory; 36 37 /** 38 * Constructor 39 * 40 * @param dataInputFactory Factory for data inputs 41 * @param messageValueFactory factory for creating message values 42 */ 43 public MessagesIterable( 44 Factory<? extends ExtendedDataInput> dataInputFactory, 45 MessageValueFactory<M> messageValueFactory) { 46 super(dataInputFactory); 47 this.messageValueFactory = messageValueFactory; 48 } 49 50 @Override 51 protected M createWritable() { 52 return messageValueFactory.newInstance(); 53 } 54 }