examples/mroperator/src/main/java/org/apache/apex/examples/mroperator/ReporterImpl.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.apex.examples.mroperator;

import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.Counters.Counter;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.Reporter;

/**
 * <p>ReporterImpl class.</p>
 *
 * @since 0.9.0
 */
public class ReporterImpl implements Reporter
{
  private Counters counters;
  InputSplit inputSplit;

  public enum ReporterType
  {
    Mapper, Reducer
  }

  private ReporterType typ;

  public ReporterImpl(final ReporterType kind, final Counters ctrs)
  {
    this.typ = kind;
    this.counters = ctrs;
  }

  @Override
  public InputSplit getInputSplit()
  {
    if (typ == ReporterType.Reducer) {
      throw new UnsupportedOperationException("Reducer cannot call getInputSplit()");
    } else {
      return inputSplit;
    }
  }

  public void setInputSplit(InputSplit inputSplit)
  {
    this.inputSplit = inputSplit;
  }

  @Override
  public void incrCounter(Enum<?> key, long amount)
  {
    if (null != counters) {
      counters.incrCounter(key, amount);
    }
  }

  @Override
  public void incrCounter(String group, String counter, long amount)
  {
    if (null != counters) {
      counters.incrCounter(group, counter, amount);
    }
  }

  @Override
  public void setStatus(String status)
  {
    // do nothing.
  }

  @Override
  public void progress()
  {
    // do nothing.
  }

  @Override
  public Counter getCounter(String group, String name)
  {
    Counters.Counter counter = null;
    if (counters != null) {
      counter = counters.findCounter(group, name);
    }

    return counter;
  }

  @Override
  public Counter getCounter(Enum<?> key)
  {
    Counters.Counter counter = null;
    if (counters != null) {
      counter = counters.findCounter(key);
    }

    return counter;
  }

  public float getProgress()
  {
    return 0;
  }

}