    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.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.tap.Tap;
    031
    032import static cascading.flow.planner.iso.expression.OrElementExpression.or;
    033
    034/**
    035 *
    036 */
    037public class StreamedAccumulatedTapsExpressionGraph extends ExpressionGraph
    038  {
    039  public StreamedAccumulatedTapsExpressionGraph()
    040    {
    041    super( SearchOrder.Depth );
    042
    043    ElementExpression sink = or(
    044      ElementCapture.Secondary,
    045      new FlowElementExpression( Tap.class ),
    046      new FlowElementExpression( Group.class )
    047    );
    048
    049    this.arc(
    050      new FlowElementExpression( ElementCapture.Primary, Tap.class ),
    051      PathScopeExpression.ALL_NON_BLOCKING,
    052      sink
    053    );
    054
    055    this.arc(
    056      new FlowElementExpression( Tap.class ),
    057      PathScopeExpression.ANY_BLOCKING,
    058      sink
    059    );
    060    }
    061  }