    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.hadoop.planner.rule.transformer;
    022
    023import cascading.flow.hadoop.planner.rule.expression.AccumulatedTapOnHashJoinExpression;
    024import cascading.flow.planner.rule.transformer.IntermediateTapElementFactory;
    025import cascading.flow.planner.rule.transformer.RuleReplaceFactoryBasedTransformer;
    026
    027import static cascading.flow.planner.rule.PlanPhase.BalanceAssembly;
    028
    029/**
    030 * The ReplaceAccumulateTapWithDistCacheTransformer will decorate all temp or checkpoint taps on the accumulated side
    031 * of a {@link cascading.pipe.HashJoin} with a {@link cascading.tap.hadoop.DistCacheTap} instance that wraps the
    032 * original Tap instance.
    033 */
    034public class ReplaceAccumulateTapWithDistCacheTransformer extends RuleReplaceFactoryBasedTransformer
    035  {
    036  public ReplaceAccumulateTapWithDistCacheTransformer()
    037    {
    038    super(
    039      BalanceAssembly,
    040      new AccumulatedTapOnHashJoinExpression(),
    041      IntermediateTapElementFactory.ACCUMULATED_TAP
    042    );
    043    }
    044  }