lang/java/reef-io/src/main/java/org/apache/reef/io/network/naming/serialization/AvroUtils.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.reef.io.network.naming.serialization;

import org.apache.avro.io.*;
import org.apache.avro.specific.SpecificDatumReader;
import org.apache.avro.specific.SpecificDatumWriter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * Utilities for AVRO.
 */
final class AvroUtils {

  private AvroUtils() {
  }

  /**
   * Serializes the given avro object to a byte[].
   *
   * @param avroObject
   * @param theClass
   * @param <T>
   * @return
   */
  static <T> byte[] toBytes(final T avroObject, final Class<T> theClass) {
    final DatumWriter<T> datumWriter = new SpecificDatumWriter<>(theClass);
    final byte[] theBytes;
    try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
      final BinaryEncoder encoder = EncoderFactory.get().binaryEncoder(out, null);
      datumWriter.write(avroObject, encoder);
      encoder.flush();
      out.flush();
      theBytes = out.toByteArray();
    } catch (final IOException e) {
      throw new RuntimeException("Unable to serialize an avro object", e);
    }
    return theBytes;
  }

  static <T> T fromBytes(final byte[] theBytes, final Class<T> theClass) {
    final BinaryDecoder decoder = DecoderFactory.get().binaryDecoder(theBytes, null);
    final SpecificDatumReader<T> reader = new SpecificDatumReader<>(theClass);
    try {
      return reader.read(null, decoder);
    } catch (final IOException e) {
      throw new RuntimeException("Failed to deserialize an avro object", e);
    }
  }
}