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.flow.stream.element; 022 023import cascading.CascadingException; 024import cascading.flow.FlowProcess; 025import cascading.flow.stream.duct.Duct; 026import cascading.flow.stream.duct.Reducing; 027import cascading.operation.GroupAssertion; 028import cascading.pipe.Every; 029import cascading.pipe.OperatorException; 030import cascading.tuple.Fields; 031import cascading.tuple.TupleEntry; 032 033/** 034 * 035 */ 036public class GroupAssertionEveryStage extends EveryStage<TupleEntry> implements Reducing<TupleEntry, TupleEntry> 037 { 038 private GroupAssertion groupAssertion; 039 private Reducing reducing; 040 041 public GroupAssertionEveryStage( FlowProcess flowProcess, Every every ) 042 { 043 super( flowProcess, every ); 044 } 045 046 @Override 047 protected Fields getIncomingPassThroughFields() 048 { 049 return incomingScopes.get( 0 ).getIncomingAggregatorPassThroughFields(); 050 } 051 052 @Override 053 protected Fields getIncomingArgumentsFields() 054 { 055 return incomingScopes.get( 0 ).getIncomingAggregatorArgumentFields(); 056 } 057 058 @Override 059 protected Fields getOutgoingSelector() 060 { 061 return outgoingScopes.get( 0 ).getOutGroupingSelector(); 062 } 063 064 @Override 065 public void initialize() 066 { 067 super.initialize(); 068 069 groupAssertion = every.getGroupAssertion(); 070 071 reducing = (Reducing) getNext(); 072 } 073 074 @Override 075 public void startGroup( Duct previous, TupleEntry groupEntry ) 076 { 077 operationCall.setGroup( groupEntry ); 078 operationCall.setArguments( null ); // zero it out 079 operationCall.setOutputCollector( null ); // zero it out 080 081 try 082 { 083 groupAssertion.start( flowProcess, operationCall ); 084 } 085 catch( CascadingException exception ) 086 { 087 handleException( exception, groupEntry ); 088 } 089 catch( Throwable throwable ) 090 { 091 handleException( new OperatorException( every, "operator Every failed starting operation: " + every.getOperation(), throwable ), groupEntry ); 092 } 093 094 reducing.startGroup( this, groupEntry ); 095 } 096 097 @Override 098 public void receive( Duct previous, TupleEntry tupleEntry ) 099 { 100 try 101 { 102 argumentsEntry.setTuple( argumentsBuilder.makeResult( tupleEntry.getTuple(), null ) ); 103 operationCall.setArguments( argumentsEntry ); 104 105 groupAssertion.aggregate( flowProcess, operationCall ); 106 } 107 catch( CascadingException exception ) 108 { 109 handleException( exception, argumentsEntry ); 110 } 111 catch( Throwable throwable ) 112 { 113 handleException( new OperatorException( every, "operator Every failed executing operation: " + every.getOperation(), throwable ), argumentsEntry ); 114 } 115 116 next.receive( this, tupleEntry ); 117 } 118 119 @Override 120 public void completeGroup( Duct previous, TupleEntry incomingEntry ) 121 { 122 this.incomingEntry = incomingEntry; 123 operationCall.setArguments( null ); 124 125 try 126 { 127 groupAssertion.doAssert( flowProcess, operationCall ); // collector calls next 128 129 reducing.completeGroup( this, incomingEntry ); 130 } 131 catch( CascadingException exception ) 132 { 133 handleException( exception, incomingEntry ); 134 } 135 catch( Throwable throwable ) 136 { 137 handleException( new OperatorException( every, "operator Every failed completing operation: " + every.getOperation(), throwable ), incomingEntry ); 138 } 139 } 140 }