001/* 002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.tap.hadoop.io; 022 023import java.io.IOException; 024 025import cascading.flow.FlowProcess; 026import cascading.flow.SliceCounters; 027import cascading.tap.Tap; 028import cascading.tap.hadoop.util.MeasuredOutputCollector; 029import cascading.tuple.TupleEntrySchemeCollector; 030import org.apache.hadoop.conf.Configuration; 031import org.apache.hadoop.mapred.OutputCollector; 032import org.apache.hadoop.mapred.RecordReader; 033 034/** 035 * Class HadoopTupleEntrySchemeCollector is a kind of {@link cascading.tuple.TupleEntryCollector} that writes tuples to the resource managed by 036 * a particular {@link cascading.tap.Tap} instance. 037 */ 038public class HadoopTupleEntrySchemeCollector extends TupleEntrySchemeCollector<Configuration, OutputCollector> 039 { 040 private MeasuredOutputCollector measuredOutputCollector; 041 042 public HadoopTupleEntrySchemeCollector( FlowProcess<? extends Configuration> flowProcess, Tap<Configuration, RecordReader, OutputCollector> tap ) throws IOException 043 { 044 super( flowProcess, tap.getScheme(), makeCollector( flowProcess, tap, null ), tap.getIdentifier() ); 045 } 046 047 public HadoopTupleEntrySchemeCollector( FlowProcess<? extends Configuration> flowProcess, Tap<Configuration, RecordReader, OutputCollector> tap, OutputCollector outputCollector ) throws IOException 048 { 049 super( flowProcess, tap.getScheme(), makeCollector( flowProcess, tap, outputCollector ), tap.getIdentifier() ); 050 } 051 052 private static OutputCollector makeCollector( FlowProcess<? extends Configuration> flowProcess, Tap<Configuration, RecordReader, OutputCollector> tap, OutputCollector outputCollector ) throws IOException 053 { 054 if( outputCollector != null ) 055 return outputCollector; 056 057 return new TapOutputCollector( flowProcess, tap ); 058 } 059 060 @Override 061 protected OutputCollector<?, ?> wrapOutput( OutputCollector outputCollector ) 062 { 063 if( measuredOutputCollector == null ) 064 measuredOutputCollector = new MeasuredOutputCollector( getFlowProcess(), SliceCounters.Write_Duration ); 065 066 measuredOutputCollector.setOutputCollector( outputCollector ); 067 068 return measuredOutputCollector; 069 } 070 }