content: /*
   * 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
   *
   *     https://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.avro.mapreduce;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.avro.Schema;
  import org.apache.avro.file.CodecFactory;
  import org.apache.avro.file.DataFileConstants;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.generic.GenericData;
  import org.apache.avro.mapred.AvroKey;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapreduce.RecordWriter;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  
  /**
   * Writes Avro records to an Avro container file output stream.
   *
   * @param <T> The Java type of the Avro data to write.
   */
  public class AvroKeyRecordWriter<T> extends RecordWriter<AvroKey<T>, NullWritable> implements Syncable {
    /** A writer for the Avro container file. */
    private final DataFileWriter<T> mAvroFileWriter;
  
    /**
     * Constructor.
     *
     * @param writerSchema     The writer schema for the records in the Avro
     *                         container file.
     * @param compressionCodec A compression codec factory for the Avro container
     *                         file.
     * @param outputStream     The output stream to write the Avro container file
     *                         to.
     * @param syncInterval     The sync interval for the Avro container file.
     * @throws IOException If the record writer cannot be opened.
     */
    public AvroKeyRecordWriter(Schema writerSchema, GenericData dataModel, CodecFactory compressionCodec,
        OutputStream outputStream, int syncInterval) throws IOException {
      // Create an Avro container file and a writer to it.
      mAvroFileWriter = new DataFileWriter<T>(dataModel.createDatumWriter(writerSchema));
      mAvroFileWriter.setCodec(compressionCodec);
      mAvroFileWriter.setSyncInterval(syncInterval);
      mAvroFileWriter.create(writerSchema, outputStream);
    }
  
    /**
     * Constructor.
     *
     * @param writerSchema     The writer schema for the records in the Avro
     *                         container file.
     * @param compressionCodec A compression codec factory for the Avro container
     *                         file.
     * @param outputStream     The output stream to write the Avro container file
     *                         to.
     * @throws IOException If the record writer cannot be opened.
     */
    public AvroKeyRecordWriter(Schema writerSchema, GenericData dataModel, CodecFactory compressionCodec,
        OutputStream outputStream) throws IOException {
      this(writerSchema, dataModel, compressionCodec, outputStream, DataFileConstants.DEFAULT_SYNC_INTERVAL);
    }
  
    /** {@inheritDoc} */
    @Override
    public void write(AvroKey<T> record, NullWritable ignore) throws IOException {
      mAvroFileWriter.append(record.datum());
    }
  
    /** {@inheritDoc} */
    @Override
    public void close(TaskAttemptContext context) throws IOException {
      mAvroFileWriter.close();
    }
  
    /** {@inheritDoc} */
    @Override
    public long sync() throws IOException {
      return mAvroFileWriter.sync();
    }
  }
  