MRReader.java example

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/**
 * 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.tez.mapreduce.lib;

import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.tez.runtime.api.InputContext;
import org.apache.tez.runtime.library.api.KeyValueReader;

@Private
public abstract class MRReader extends KeyValueReader {
  
  private final InputContext context;
  
  public abstract void setSplit(Object split) throws IOException;
  public abstract boolean isSetup();
  public abstract float getProgress() throws IOException, InterruptedException;
  public abstract void close() throws IOException;
  public abstract Object getSplit();
  public abstract Object getRecordReader();
  
  public MRReader(InputContext context) {
    this.context = context;
  }
  
  protected final void notifyProgress() {
    context.notifyProgress();
  }
  
  protected final void notifyDone() {
    context.notifyProgress();
  }
}