001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.data.loading.impl;
020
021import org.apache.commons.codec.binary.Base64;
022import org.apache.reef.tang.annotations.Name;
023import org.apache.reef.tang.annotations.NamedParameter;
024
025import java.io.*;
026import java.util.Set;
027
028/**
029 * Serialize and deserialize {@link DistributedDataSetPartition} objects.
030 */
031public final class DistributedDataSetPartitionSerializer {
032
033  public static String serialize(final DistributedDataSetPartition partition) {
034    try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
035      final DataOutputStream daos = new DataOutputStream(baos);
036      daos.writeUTF(partition.getPath());
037      daos.writeUTF(partition.getLocation());
038      daos.writeInt(partition.getDesiredSplits());
039      return Base64.encodeBase64String(baos.toByteArray());
040    } catch (final IOException e) {
041      throw new RuntimeException("Unable to serialize distributed data partition", e);
042    }
043  }
044
045  public static DistributedDataSetPartition deserialize(final String serializedPartition) {
046    try (ByteArrayInputStream bais = new ByteArrayInputStream(Base64.decodeBase64(serializedPartition))) {
047      final DataInputStream dais = new DataInputStream(bais);
048      return new DistributedDataSetPartition(dais.readUTF(), dais.readUTF(), dais.readInt());
049    } catch (final IOException e) {
050      throw new RuntimeException("Unable to de-serialize distributed data partition", e);
051    }
052  }
053
054  /**
055   * Empty private constructor to prohibit instantiation of utility class.
056   */
057  private DistributedDataSetPartitionSerializer() {
058  }
059
060  /**
061   * Allows to specify a set of distributed data set partitions.
062   */
063  @NamedParameter(doc = "Sets of distributed data set partitions")
064  public static final class DistributedDataSetPartitions implements Name<Set<String>> {
065  }
066}