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.expression;
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.rule.RuleExpression;
029import cascading.pipe.Boundary;
030import cascading.pipe.HashJoin;
031import cascading.pipe.Pipe;
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 BalanceSplitSplitToStreamedHashJoinExpression extends RuleExpression
040  {
041  private static final FlowElementExpression SHARED_SPLIT = new FlowElementExpression( Pipe.class, TypeExpression.Topo.Split );
042  public static final FlowElementExpression SHARED_HASHJOIN = new FlowElementExpression( HashJoin.class );
043
044  public BalanceSplitSplitToStreamedHashJoinExpression()
045    {
046    super(
047      new ExpressionGraph(
048        and(
049          ElementCapture.Primary,
050          not( and( new FlowElementExpression( Pipe.class, TypeExpression.Topo.Split ), not( new FlowElementExpression( Boundary.class ) ) ) ),
051          not( new FlowElementExpression( HashJoin.class ) ) ) ),
052
053      new ExpressionGraph()
054        .arcs( SHARED_SPLIT, SHARED_HASHJOIN )
055        .arcs( SHARED_SPLIT, new FlowElementExpression( Pipe.class, TypeExpression.Topo.Split ), SHARED_HASHJOIN ),
056
057      new ExpressionGraph()
058        .arc(
059          and( ElementCapture.Secondary, new FlowElementExpression( Pipe.class ), not( new FlowElementExpression( Boundary.class ) ) ),
060          PathScopeExpression.NON_BLOCKING,
061          new FlowElementExpression( ElementCapture.Primary, HashJoin.class )
062        )
063    );
064    }
065  }