001    /*
002     * Copyright (c) 2007-2014 Concurrent, 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    
021    package cascading.flow.hadoop;
022    
023    import cascading.flow.FlowProcess;
024    import cascading.tap.Tap;
025    import org.apache.hadoop.mapred.JobConf;
026    
027    /** Class MapReduceFlowStep wraps a {@link JobConf} and allows it to be executed as a {@link cascading.flow.Flow}. */
028    public class MapReduceFlowStep extends HadoopFlowStep
029      {
030      /** Field jobConf */
031      private final JobConf jobConf;
032    
033      MapReduceFlowStep( String flowName, String stepName, JobConf jobConf, Tap sink )
034        {
035        super( stepName, 1 );
036        setFlowName( flowName );
037        this.jobConf = jobConf;
038        addSink( "default", sink );
039        }
040    
041      @Override
042      public JobConf getInitializedConfig( FlowProcess<JobConf> flowProcess, JobConf parentConfig )
043        {
044        // allow to delete
045        getSink().sinkConfInit( flowProcess, new JobConf() );
046    
047        return jobConf;
048        }
049      }