| /* |
| * 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.parquet.hadoop.util; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Base64; |
| import java.util.zip.GZIPInputStream; |
| import java.util.zip.GZIPOutputStream; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Serialization utils copied from: |
| * https://github.com/kevinweil/elephant-bird/blob/master/core/src/main/java/com/twitter/elephantbird/util/HadoopUtils.java |
| * |
| * TODO: Refactor elephant-bird so that we can depend on utils like this without extra baggage. |
| */ |
| public final class SerializationUtil { |
| |
| private SerializationUtil() { } |
| |
| /** |
| * Writes an object to a configuration. |
| * |
| * @param key for the configuration |
| * @param obj the object to write |
| * @param conf to read from |
| * @throws IOException if there is an error while writing |
| */ |
| public static void writeObjectToConfAsBase64(String key, Object obj, Configuration conf) throws IOException { |
| try(ByteArrayOutputStream baos = new ByteArrayOutputStream()) { |
| try(GZIPOutputStream gos = new GZIPOutputStream(baos); |
| ObjectOutputStream oos = new ObjectOutputStream(gos)) { |
| oos.writeObject(obj); |
| } |
| conf.set(key, |
| new String(Base64.getMimeEncoder().encode(baos.toByteArray()), |
| StandardCharsets.UTF_8)); |
| } |
| } |
| |
| /** |
| * Reads an object (that was written using |
| * {@link #writeObjectToConfAsBase64}) from a configuration |
| * |
| * @param key for the configuration |
| * @param conf to read from |
| * @param <T> the Java type of the deserialized object |
| * @return the read object, or null if key is not present in conf |
| * @throws IOException if there is an error while reading |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> T readObjectFromConfAsBase64(String key, Configuration conf) throws IOException { |
| String b64 = conf.get(key); |
| if (b64 == null) { |
| return null; |
| } |
| |
| byte[] bytes = |
| Base64.getMimeDecoder().decode(b64.getBytes(StandardCharsets.UTF_8)); |
| |
| try (ByteArrayInputStream bais = new ByteArrayInputStream(bytes); |
| GZIPInputStream gis = new GZIPInputStream(bais); |
| ObjectInputStream ois = new ObjectInputStream(gis)) { |
| return (T) ois.readObject(); |
| } catch (ClassNotFoundException e) { |
| throw new IOException("Could not read object from config with key " + key, e); |
| } catch (ClassCastException e) { |
| throw new IOException("Could not cast object read from config with key " + key, e); |
| } |
| } |
| } |