    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.planner.rule.expressiongraph;
    022
    023import cascading.flow.planner.iso.expression.ElementCapture;
    024import cascading.flow.planner.iso.expression.ElementExpression;
    025import cascading.flow.planner.iso.expression.ExpressionGraph;
    026import cascading.flow.planner.iso.expression.FlowElementExpression;
    027import cascading.flow.planner.iso.expression.OrElementExpression;
    028import cascading.flow.planner.iso.expression.PathScopeExpression;
    029import cascading.flow.planner.iso.finder.SearchOrder;
    030import cascading.pipe.Group;
    031import cascading.pipe.HashJoin;
    032import cascading.tap.Tap;
    033
    034/**
    035 *
    036 */
    037public class NonBlockedBlockedJoinExpressionGraph extends ExpressionGraph
    038  {
    039  public NonBlockedBlockedJoinExpressionGraph()
    040    {
    041    super( SearchOrder.ReverseDepth );
    042
    043    ElementExpression source = OrElementExpression.or( ElementCapture.Primary, new FlowElementExpression( Tap.class ), new FlowElementExpression( Group.class ) );
    044    ElementExpression sink = new FlowElementExpression( ElementCapture.Secondary, HashJoin.class );
    045
    046    this.arc(
    047      source,
    048      PathScopeExpression.ANY_NON_BLOCKING,
    049      sink
    050    );
    051
    052    this.arc(
    053      source,
    054      PathScopeExpression.ANY_BLOCKING,
    055      sink
    056    );
    057    }
    058  }