001/*
002 * Copyright (c) 2007-2022 The Cascading Authors. All Rights Reserved.
003 *
004 * Project and contact information: https://cascading.wensel.net/
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.AnnotationExpression;
024import cascading.flow.planner.iso.expression.ElementCapture;
025import cascading.flow.planner.iso.expression.ElementExpression;
026import cascading.flow.planner.iso.expression.ExpressionGraph;
027import cascading.flow.planner.iso.expression.FlowElementExpression;
028import cascading.flow.planner.iso.expression.PathScopeExpression;
029import cascading.flow.planner.iso.expression.TypeExpression;
030import cascading.flow.planner.iso.finder.SearchOrder;
031import cascading.flow.planner.rule.elementexpression.BoundariesElementExpression;
032import cascading.flow.stream.graph.IORole;
033import cascading.pipe.Boundary;
034import cascading.pipe.Group;
035import cascading.pipe.HashJoin;
036import cascading.pipe.Merge;
037import cascading.tap.Tap;
038
039import static cascading.flow.planner.iso.expression.AndElementExpression.and;
040import static cascading.flow.planner.iso.expression.NotElementExpression.not;
041import static cascading.flow.planner.iso.expression.OrElementExpression.or;
042
043/**
044 *
045 */
046public class BottomUpConsecutiveBoundariesExpressionGraph extends ExpressionGraph
047  {
048  public BottomUpConsecutiveBoundariesExpressionGraph()
049    {
050    super( SearchOrder.ReverseTopological );
051
052    ElementExpression head = or(
053      new FlowElementExpression( Boundary.class ),
054      new FlowElementExpression( Tap.class ),
055      new FlowElementExpression( Group.class, TypeExpression.Topo.LinearOut ),
056      new FlowElementExpression( Merge.class, TypeExpression.Topo.LinearOut )
057    );
058
059    FlowElementExpression shared = new FlowElementExpression( ElementCapture.Secondary, HashJoin.class );
060
061    ElementExpression tail = or(
062      ElementCapture.Primary,
063      and(
064        new BoundariesElementExpression( TypeExpression.Topo.LinearIn ),
065        not( new AnnotationExpression( IORole.sink ) )
066      ),
067      new BoundariesElementExpression( TypeExpression.Topo.Splice )
068    );
069
070    this.arc(
071      head,
072
073      PathScopeExpression.ANY,
074
075      shared
076    );
077
078    this.arc(
079      shared,
080
081      PathScopeExpression.ANY,
082
083      tail
084    );
085    }
086  }