001/* 002 * Copyright (c) 2007-2017 Xplenty, 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.scheme.Scheme; 028import cascading.tap.Tap; 029import cascading.tap.hadoop.util.MeasuredRecordReader; 030import cascading.tuple.TupleEntrySchemeIterator; 031import cascading.util.CloseableIterator; 032import org.apache.hadoop.conf.Configuration; 033import org.apache.hadoop.mapred.RecordReader; 034 035/** 036 * 037 */ 038public class HadoopTupleEntrySchemeIterator extends TupleEntrySchemeIterator<Configuration, RecordReader> 039 { 040 private MeasuredRecordReader measuredRecordReader; 041 042 public HadoopTupleEntrySchemeIterator( FlowProcess<? extends Configuration> flowProcess, Tap parentTap, RecordReader recordReader ) throws IOException 043 { 044 this( flowProcess, parentTap.getScheme(), makeIterator( flowProcess, parentTap, recordReader ) ); 045 } 046 047 public HadoopTupleEntrySchemeIterator( FlowProcess<? extends Configuration> flowProcess, Scheme scheme, CloseableIterator<RecordReader> closeableIterator ) 048 { 049 super( flowProcess, scheme, closeableIterator, flowProcess.getStringProperty( MultiInputSplit.CASCADING_SOURCE_PATH ) ); 050 } 051 052 private static CloseableIterator<RecordReader> makeIterator( FlowProcess<? extends Configuration> flowProcess, Tap parentTap, RecordReader recordReader ) throws IOException 053 { 054 if( recordReader != null ) 055 return new RecordReaderIterator( recordReader ); 056 057 return new MultiRecordReaderIterator( flowProcess, parentTap ); 058 } 059 060 @Override 061 protected RecordReader wrapInput( RecordReader recordReader ) 062 { 063 if( measuredRecordReader == null ) 064 measuredRecordReader = new MeasuredRecordReader( getFlowProcess(), SliceCounters.Read_Duration ); 065 066 measuredRecordReader.setRecordReader( recordReader ); 067 068 return measuredRecordReader; 069 } 070 }