001/*
002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. 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.hadoop.planner.rule.expression;
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.PathScopeExpression;
028import cascading.flow.planner.iso.finder.SearchOrder;
029import cascading.pipe.Group;
030import cascading.pipe.HashJoin;
031import cascading.pipe.Merge;
032import cascading.tap.Tap;
033
034import static cascading.flow.planner.iso.expression.OrElementExpression.or;
035
036/**
037 *
038 */
039public class StreamedAccumulatedTapsHashJoinExpressionGraph extends ExpressionGraph
040  {
041  public StreamedAccumulatedTapsHashJoinExpressionGraph()
042    {
043    super( SearchOrder.Depth );
044
045    FlowElementExpression split = new FlowElementExpression( Tap.class );
046
047    ElementExpression join = new FlowElementExpression( HashJoin.class );
048
049    ElementExpression merge = new FlowElementExpression( Merge.class );
050
051    ElementExpression sink = or(
052      ElementCapture.Secondary,
053      new FlowElementExpression( Tap.class ),
054      new FlowElementExpression( Group.class )
055    );
056
057    this.arc(
058      new FlowElementExpression( ElementCapture.Primary, Tap.class ),
059      PathScopeExpression.ALL_NON_BLOCKING,
060      join
061    );
062
063    this.arc(
064      split,
065      PathScopeExpression.ALL_BLOCKING, // if ANY_BLOCKING DualStreamedAccumulatedMergePipelineAssert will fire
066      join
067    );
068
069    this.arc(
070      join,
071      PathScopeExpression.ANY,
072      merge
073    );
074
075    this.arc(
076      split,
077      PathScopeExpression.NO_CAPTURE,
078      merge
079    );
080
081    this.arc(
082      merge,
083      PathScopeExpression.ANY,
084      sink
085    );
086    }
087  }