    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.partitioner;
    022
    023import cascading.flow.hadoop.planner.rule.expression.StreamedAccumulatedTapsHashJoinPipelinePartitionExpression;
    024import cascading.flow.planner.iso.ElementAnnotation;
    025import cascading.flow.planner.iso.expression.ElementCapture;
    026import cascading.flow.planner.rule.partitioner.ExpressionRulePartitioner;
    027import cascading.flow.stream.annotations.StreamMode;
    028
    029import static cascading.flow.planner.rule.PlanPhase.PartitionPipelines;
    030
    031/**
    032 * This rule accounts for a Tap marked as both streamed and accumulated, but is streamed in one pipeline and
    033 * accumulated in another pipeline.
    034 * <p>
    035 * The rule leverages the ability to not capture some matched edges, that represent paths that should not be included
    036 * in the result pipeline.
    037 */
    038public class StreamedAccumulatedTapsHashJoinPipelinePartitioner extends ExpressionRulePartitioner
    039  {
    040  public StreamedAccumulatedTapsHashJoinPipelinePartitioner()
    041    {
    042    super(
    043      PartitionPipelines,
    044      new StreamedAccumulatedTapsHashJoinPipelinePartitionExpression(),
    045      new ElementAnnotation( ElementCapture.Primary, StreamMode.Streamed ),
    046      new ElementAnnotation( ElementCapture.Include, StreamMode.Accumulated )
    047    );
    048    }
    049  }