    001/*
    002 * Copyright (c) 2007-2016 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
    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 BalanceSplitToStreamedHashJoinExpression 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 BalanceSplitToStreamedHashJoinExpression()
    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, 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  }