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 */ 020 021 package cascading.flow.stream; 022 023 import cascading.CascadingException; 024 import cascading.flow.FlowProcess; 025 import cascading.operation.GroupAssertion; 026 import cascading.pipe.Every; 027 import cascading.pipe.OperatorException; 028 import cascading.tuple.Fields; 029 import cascading.tuple.TupleEntry; 030 031 /** 032 * 033 */ 034 public class GroupAssertionEveryStage extends EveryStage<TupleEntry> implements Reducing<TupleEntry, TupleEntry> 035 { 036 private GroupAssertion groupAssertion; 037 private Reducing reducing; 038 039 public GroupAssertionEveryStage( FlowProcess flowProcess, Every every ) 040 { 041 super( flowProcess, every ); 042 } 043 044 @Override 045 protected Fields getIncomingPassThroughFields() 046 { 047 return incomingScopes.get( 0 ).getIncomingAggregatorPassThroughFields(); 048 } 049 050 @Override 051 protected Fields getIncomingArgumentsFields() 052 { 053 return incomingScopes.get( 0 ).getIncomingAggregatorArgumentFields(); 054 } 055 056 @Override 057 protected Fields getOutgoingSelector() 058 { 059 return outgoingScopes.get( 0 ).getOutGroupingSelector(); 060 } 061 062 @Override 063 public void initialize() 064 { 065 super.initialize(); 066 067 groupAssertion = every.getGroupAssertion(); 068 069 reducing = (Reducing) getNext(); 070 } 071 072 @Override 073 public void startGroup( Duct previous, TupleEntry groupEntry ) 074 { 075 operationCall.setGroup( groupEntry ); 076 operationCall.setArguments( null ); // zero it out 077 operationCall.setOutputCollector( null ); // zero it out 078 079 try 080 { 081 groupAssertion.start( flowProcess, operationCall ); 082 } 083 catch( CascadingException exception ) 084 { 085 handleException( exception, groupEntry ); 086 } 087 catch( Throwable throwable ) 088 { 089 handleException( new OperatorException( every, "operator Every failed starting operation: " + every.getOperation(), throwable ), groupEntry ); 090 } 091 092 reducing.startGroup( this, groupEntry ); 093 } 094 095 @Override 096 public void receive( Duct previous, TupleEntry tupleEntry ) 097 { 098 try 099 { 100 argumentsEntry.setTuple( argumentsBuilder.makeResult( tupleEntry.getTuple(), null ) ); 101 operationCall.setArguments( argumentsEntry ); 102 103 groupAssertion.aggregate( flowProcess, operationCall ); 104 } 105 catch( CascadingException exception ) 106 { 107 handleException( exception, argumentsEntry ); 108 } 109 catch( Throwable throwable ) 110 { 111 handleException( new OperatorException( every, "operator Every failed executing operation: " + every.getOperation(), throwable ), argumentsEntry ); 112 } 113 114 next.receive( this, tupleEntry ); 115 } 116 117 @Override 118 public void completeGroup( Duct previous, TupleEntry incomingEntry ) 119 { 120 this.incomingEntry = incomingEntry; 121 operationCall.setArguments( null ); 122 123 try 124 { 125 groupAssertion.doAssert( flowProcess, operationCall ); // collector calls next 126 127 reducing.completeGroup( this, incomingEntry ); 128 } 129 catch( CascadingException exception ) 130 { 131 handleException( exception, incomingEntry ); 132 } 133 catch( Throwable throwable ) 134 { 135 handleException( new OperatorException( every, "operator Every failed completing operation: " + every.getOperation(), throwable ), incomingEntry ); 136 } 137 } 138 }