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  }