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.flow.tez.planner.rule.expressiongraph; 022 023import cascading.flow.planner.iso.expression.ElementCapture; 024import cascading.flow.planner.iso.expression.ExpressionGraph; 025import cascading.flow.planner.iso.expression.FlowElementExpression; 026import cascading.flow.planner.iso.expression.PathScopeExpression; 027import cascading.flow.planner.iso.expression.TypeExpression; 028import cascading.flow.planner.iso.finder.SearchOrder; 029import cascading.pipe.Boundary; 030import cascading.pipe.Group; 031import cascading.pipe.HashJoin; 032import cascading.pipe.Merge; 033import cascading.tap.Tap; 034 035import static cascading.flow.planner.iso.expression.OrElementExpression.or; 036 037/** 038 * Captures the source when the pipeline only has a single source and its streamed. 039 */ 040public class StreamedSelfJoinSourcesExpressionGraph extends ExpressionGraph 041 { 042 public StreamedSelfJoinSourcesExpressionGraph() 043 { 044 super( SearchOrder.Depth, true ); 045 046 FlowElementExpression intermediate = new FlowElementExpression( HashJoin.class, TypeExpression.Topo.Linear ); 047 048 this.arc( 049 or( ElementCapture.Primary, 050 new FlowElementExpression( Tap.class, TypeExpression.Topo.LinearOut ), 051 new FlowElementExpression( Boundary.class, TypeExpression.Topo.LinearOut ), 052 new FlowElementExpression( Group.class, TypeExpression.Topo.LinearOut ) 053 ), 054 PathScopeExpression.ALL, 055 intermediate 056 ); 057 058 this.arc( 059 intermediate, 060 PathScopeExpression.ALL, 061 or( 062 new FlowElementExpression( Tap.class ), 063 new FlowElementExpression( Boundary.class ), 064 new FlowElementExpression( Merge.class ), 065 new FlowElementExpression( Group.class ) 066 ) 067 ); 068 } 069 }