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.tez.planner.rule.expressiongraph; 023 024import cascading.flow.planner.iso.expression.ElementCapture; 025import cascading.flow.planner.iso.expression.ExpressionGraph; 026import cascading.flow.planner.iso.expression.FlowElementExpression; 027import cascading.flow.planner.iso.expression.PathScopeExpression; 028import cascading.flow.planner.iso.expression.TypeExpression.Topo; 029import cascading.flow.planner.iso.finder.SearchOrder; 030import cascading.flow.planner.rule.elementexpression.BoundariesElementExpression; 031import cascading.tap.Tap; 032 033import static cascading.flow.planner.iso.expression.AndElementExpression.and; 034import static cascading.flow.planner.iso.expression.NotElementExpression.not; 035 036/** 037 * 038 */ 039public class TopDownSplitJoinBoundariesExpressionGraph extends ExpressionGraph 040 { 041 public TopDownSplitJoinBoundariesExpressionGraph() 042 { 043 super( SearchOrder.Topological ); 044 045 this.arc( 046 new BoundariesElementExpression( Topo.Split ), 047 048 PathScopeExpression.ANY, 049 050 // don't capture a contracted graph having a tap split to a splice tap (two taps with two edges) 051 // this interferes if there is a logical split and merge 052 and( 053 ElementCapture.Primary, 054 new BoundariesElementExpression( Topo.Splice ), 055 not( new FlowElementExpression( Tap.class ) ) 056 ) 057 ); 058 } 059 }