    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.planner.rule;
    022
    023/**
    024 */
    025public enum ProcessLevel
    026  {
    027    /**
    028     * Applies assertions or transformations to the whole FlowElement assembly.
    029     */
    030    Assembly,
    031
    032    /**
    033     * Applies to sub-graphs of a flow where a step is a submitted unit of cluster work.
    034     */
    035    Step,
    036
    037    /**
    038     * Applies to generation sub-graphs of steps where is a node is a unit of processing with a step.
    039     * <p/>
    040     * In MapReduce its a Map or Reduce node (where Map and Reduce are Kinds).
    041     * <p/>
    042     * In Tez its a Processor.
    043     */
    044    Node,
    045
    046    /**
    047     * Applies to sub-graphs within nodes having a single streamed input, and multiple accumulated inputs.
    048     * <p/>
    049     * In MapReduce, a Mapper task can arbitrarily process a given input file via the MultiInputSplit.
    050     * <p/>
    051     * Tez currently does not allow multiply physical inputs per processor.
    052     */
    053    Pipeline;
    054
    055  public static ProcessLevel parent( ProcessLevel level )
    056    {
    057    if( level == Assembly )
    058      return null;
    059
    060    return ProcessLevel.values()[ level.ordinal() - 1 ];
    061    }
    062  }