Package eu.stratosphere.test.iterative

Source Code of eu.stratosphere.test.iterative.IterationWithUnionITCase$DummyReducer

/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
**********************************************************************************************************************/

package eu.stratosphere.test.iterative;

import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;

import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import eu.stratosphere.api.common.Plan;
import eu.stratosphere.api.java.record.operators.BulkIteration;
import eu.stratosphere.api.java.record.operators.FileDataSink;
import eu.stratosphere.api.java.record.operators.FileDataSource;
import eu.stratosphere.api.java.record.functions.MapFunction;
import eu.stratosphere.api.java.record.functions.ReduceFunction;
import eu.stratosphere.api.java.record.operators.MapOperator;
import eu.stratosphere.configuration.Configuration;
import eu.stratosphere.test.recordJobs.kmeans.udfs.PointOutFormat;
import eu.stratosphere.test.recordJobs.kmeans.udfs.PointInFormat;
import eu.stratosphere.test.util.RecordAPITestBase;
import eu.stratosphere.types.Record;
import eu.stratosphere.util.Collector;

@RunWith(Parameterized.class)
public class IterationWithUnionITCase extends RecordAPITestBase {

  private static final String DATAPOINTS = "0|50.90|16.20|72.08|\n" + "1|73.65|61.76|62.89|\n" + "2|61.73|49.95|92.74|\n";

  protected String dataPath;
  protected String resultPath;

 
  public IterationWithUnionITCase(Configuration config) {
    super(config);
  }

  @Override
  protected void preSubmit() throws Exception {
    dataPath = createTempFile("datapoints.txt", DATAPOINTS);
    resultPath = getTempDirPath("union_iter_result");
  }
 
  @Override
  protected void postSubmit() throws Exception {
    compareResultsByLinesInMemory(DATAPOINTS + DATAPOINTS + DATAPOINTS + DATAPOINTS, resultPath);
  }

  @Override
  protected Plan getTestJob() {
    return getPlan(config.getInteger("IterationWithUnionITCase#NumSubtasks", 1), dataPath, resultPath);
  }

  @Parameters
  public static Collection<Object[]> getConfigurations() {
    Configuration config1 = new Configuration();
    config1.setInteger("IterationWithUnionITCase#NumSubtasks", 4);

    return toParameterList(config1);
  }
 
  private static Plan getPlan(int numSubTasks, String input, String output) {
    FileDataSource initialInput = new FileDataSource(new PointInFormat(), input, "Input");
    initialInput.setDegreeOfParallelism(1);
   
    BulkIteration iteration = new BulkIteration("Loop");
    iteration.setInput(initialInput);
    iteration.setMaximumNumberOfIterations(2);

    @SuppressWarnings("unchecked")
    MapOperator map2 = MapOperator.builder(new IdentityMapper()).input(iteration.getPartialSolution(), iteration.getPartialSolution()).name("map").build();
   
    iteration.setNextPartialSolution(map2);

    FileDataSink finalResult = new FileDataSink(new PointOutFormat(), output, iteration, "Output");

    Plan plan = new Plan(finalResult, "Iteration with union test");
    plan.setDefaultParallelism(numSubTasks);
    return plan;
  }
 
  static final class IdentityMapper extends MapFunction implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public void map(Record rec, Collector<Record> out) {
      out.collect(rec);
    }
  }

  static final class DummyReducer extends ReduceFunction implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public void reduce(Iterator<Record> it, Collector<Record> out) {
      while (it.hasNext()) {
        out.collect(it.next());
      }
    }
  }
}
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