    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  }