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.data.loading.impl; 020 021import org.apache.hadoop.mapred.InputSplit; 022import org.apache.hadoop.mapred.JobConf; 023import org.apache.reef.annotations.audience.TaskSide; 024import org.apache.reef.tang.ExternalConstructor; 025import org.apache.reef.tang.annotations.Name; 026import org.apache.reef.tang.annotations.NamedParameter; 027import org.apache.reef.tang.annotations.Parameter; 028 029import javax.inject.Inject; 030 031/** 032 * A Tang external constructor to inject an InputSplit. 033 * by deserializing the serialized input split assigned 034 * to this evaluator 035 */ 036@TaskSide 037public class InputSplitExternalConstructor implements ExternalConstructor<InputSplit> { 038 039 private final InputSplit inputSplit; 040 041 @Inject 042 public InputSplitExternalConstructor( 043 final JobConf jobConf, 044 @Parameter(SerializedInputSplit.class) final String serializedInputSplit) { 045 this.inputSplit = WritableSerializer.deserialize(serializedInputSplit, jobConf); 046 } 047 048 @Override 049 public InputSplit newInstance() { 050 return inputSplit; 051 } 052 053 @NamedParameter 054 public static final class SerializedInputSplit implements Name<String> { 055 } 056 057}