001/*
002 * Copyright (c) 2016 Chris K Wensel <chris@wensel.net>. All Rights Reserved.
003 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved.
004 *
005 * Project and contact information: http://www.cascading.org/
006 *
007 * This file is part of the Cascading project.
008 *
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *     http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 */
021
022package cascading.flow.hadoop.planner.rule.expression;
023
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.finder.SearchOrder;
030import cascading.pipe.Group;
031import cascading.tap.Tap;
032
033import static cascading.flow.planner.iso.expression.OrElementExpression.or;
034
035/**
036 *
037 */
038public class StreamedAccumulatedTapsExpressionGraph extends ExpressionGraph
039  {
040  public StreamedAccumulatedTapsExpressionGraph()
041    {
042    super( SearchOrder.Depth );
043
044    ElementExpression sink = or(
045      ElementCapture.Secondary,
046      new FlowElementExpression( Tap.class ),
047      new FlowElementExpression( Group.class )
048    );
049
050    this.arc(
051      new FlowElementExpression( ElementCapture.Primary, Tap.class ),
052      PathScopeExpression.ALL_NON_BLOCKING,
053      sink
054    );
055
056    this.arc(
057      new FlowElementExpression( Tap.class ),
058      PathScopeExpression.ALL_BLOCKING, // if ANY_BLOCKING DualStreamedAccumulatedMergePipelineAssert will fire
059      sink
060    );
061    }
062  }