    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.tez.planner.rule.assertion;
    022
    023import cascading.flow.hadoop.planner.rule.expression.DualStreamedAccumulatedExpression;
    024import cascading.flow.planner.rule.RuleAssert;
    025
    026import static cascading.flow.planner.rule.PlanPhase.PostNodes;
    027
    028/**
    029 * Throws a planner failure if a Tap, both accumulating and streamed, flows into a single merge within a given
    030 * pipeline.
    031 * <p/>
    032 * The optimization is to remove the streamed edge between tap and merge, but GraphFinder needs to support marking
    033 * edges.
    034 */
    035public class DualStreamedAccumulatedMergeNodeAssert extends RuleAssert
    036  {
    037  public DualStreamedAccumulatedMergeNodeAssert()
    038    {
    039    super(
    040      PostNodes,
    041      new DualStreamedAccumulatedExpression(),
    042      "may not merge accumulated and streamed in same pipeline: {Secondary}"
    043    );
    044    }
    045  }