Package eu.stratosphere.nephele.taskmanager

Source Code of eu.stratosphere.nephele.taskmanager.TaskInputSplitProvider

/***********************************************************************************************************************
* 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.nephele.taskmanager;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;

import eu.stratosphere.core.io.InputSplit;
import eu.stratosphere.nephele.executiongraph.ExecutionVertexID;
import eu.stratosphere.nephele.jobgraph.JobID;
import eu.stratosphere.nephele.jobmanager.splitassigner.InputSplitWrapper;
import eu.stratosphere.nephele.protocols.InputSplitProviderProtocol;
import eu.stratosphere.nephele.template.InputSplitProvider;
import eu.stratosphere.nephele.types.IntegerRecord;
import eu.stratosphere.util.StringUtils;

/**
* The task input split provider is a component of the task manager which implements the {@link InputSplitProvider}
* interface. It is called by a task in order to acquire a new input split to consume. The task input split provider in
* return will call the global input split provider to retrieve a new input split.
* <p>
* This class is thread-safe.
*
*/
public class TaskInputSplitProvider implements InputSplitProvider {

  private final JobID jobID;

  private final ExecutionVertexID executionVertexID;

  private final InputSplitProviderProtocol globalInputSplitProvider;

  private final AtomicInteger sequenceNumber = new AtomicInteger(0);

  TaskInputSplitProvider(final JobID jobID, final ExecutionVertexID executionVertexID,
      final InputSplitProviderProtocol globalInputSplitProvider) {

    this.jobID = jobID;
    this.executionVertexID = executionVertexID;
    this.globalInputSplitProvider = globalInputSplitProvider;
  }


  @Override
  public InputSplit getNextInputSplit() {

    try {

      synchronized (this.globalInputSplitProvider) {
        final InputSplitWrapper wrapper = this.globalInputSplitProvider.requestNextInputSplit(this.jobID,
          this.executionVertexID, new IntegerRecord(this.sequenceNumber.getAndIncrement()));
        return wrapper.getInputSplit();
      }

    } catch (IOException ioe) {
      // Convert IOException into a RuntimException and let the regular fault tolerance routines take care of the
      // rest
      throw new RuntimeException(StringUtils.stringifyException(ioe));
    }
  }
}
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