001/* 002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. All Rights Reserved. 003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved. 004 * 005 * Project and contact information: http://www.cascading.org/ 006 * 007 * This file is part of the Cascading project. 008 * 009 * Licensed under the Apache License, Version 2.0 (the "License"); 010 * you may not use this file except in compliance with the License. 011 * You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, software 016 * distributed under the License is distributed on an "AS IS" BASIS, 017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 018 * See the License for the specific language governing permissions and 019 * limitations under the License. 020 */ 021 022package cascading.flow.hadoop.stream.element; 023 024import cascading.flow.FlowProcess; 025import cascading.flow.hadoop.HadoopCoGroupClosure; 026import cascading.flow.hadoop.HadoopFlowProcess; 027import cascading.flow.hadoop.stream.HadoopGroupGate; 028import cascading.flow.stream.duct.Duct; 029import cascading.flow.stream.graph.IORole; 030import cascading.flow.stream.graph.StreamGraph; 031import cascading.pipe.CoGroup; 032import cascading.tuple.Tuple; 033import cascading.tuple.io.IndexTuple; 034import cascading.tuple.io.KeyIndexTuple; 035import cascading.tuple.io.ValueIndexTuple; 036import org.apache.hadoop.mapred.OutputCollector; 037 038/** 039 * 040 */ 041public class HadoopCoGroupGate extends HadoopGroupGate 042 { 043 IndexTuple keyTuple = new KeyIndexTuple(); 044 IndexTuple valueTuple = new ValueIndexTuple(); 045 046 public HadoopCoGroupGate( FlowProcess flowProcess, CoGroup coGroup, IORole role ) 047 { 048 super( flowProcess, coGroup, role ); 049 } 050 051 @Override 052 public void bind( StreamGraph streamGraph ) 053 { 054 super.bind( streamGraph ); 055 } 056 057 @Override 058 protected HadoopCoGroupClosure createClosure() 059 { 060 return new HadoopCoGroupClosure( flowProcess, splice.getNumSelfJoins(), keyFields, valuesFields ); 061 } 062 063 @Override 064 protected void wrapGroupingAndCollect( Duct previous, int ordinal, Tuple valuesTuple, Tuple groupKey ) throws java.io.IOException 065 { 066 keyTuple.setIndex( ordinal ); 067 keyTuple.setTuple( groupKey ); 068 069 valueTuple.setIndex( ordinal ); 070 valueTuple.setTuple( valuesTuple ); 071 072 collector.collect( keyTuple, valueTuple ); 073 } 074 075 @Override 076 protected Tuple unwrapGrouping( Tuple key ) 077 { 078 return ( (IndexTuple) key ).getTuple(); 079 } 080 081 protected OutputCollector createOutputCollector() 082 { 083 return ( (HadoopFlowProcess) flowProcess ).getOutputCollector(); 084 } 085 }