| /** |
| * 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 backtype.storm.serialization; |
| |
| import java.util.Map; |
| import java.util.zip.GZIPInputStream; |
| |
| /** |
| * Always writes gzip out, but tests incoming to see if it's gzipped. If it is, deserializes with gzip. If not, uses |
| * {@link ThriftSerializationDelegate} to deserialize. Any logic needing to be enabled via {@link #prepare(Map)} is |
| * passed through to both delegates. |
| */ |
| public class GzipBridgeThriftSerializationDelegate implements SerializationDelegate { |
| |
| private ThriftSerializationDelegate defaultDelegate = new ThriftSerializationDelegate(); |
| private GzipThriftSerializationDelegate gzipDelegate = new GzipThriftSerializationDelegate(); |
| |
| @Override |
| public void prepare(Map stormConf) { |
| defaultDelegate.prepare(stormConf); |
| gzipDelegate.prepare(stormConf); |
| } |
| |
| @Override |
| public byte[] serialize(Object object) { |
| return gzipDelegate.serialize(object); |
| } |
| |
| @Override |
| public <T> T deserialize(byte[] bytes, Class<T> clazz) { |
| if (isGzipped(bytes)) { |
| return gzipDelegate.deserialize(bytes, clazz); |
| } else { |
| return defaultDelegate.deserialize(bytes, clazz); |
| } |
| } |
| |
| // Split up GZIP_MAGIC into readable bytes |
| private static final byte GZIP_MAGIC_FIRST_BYTE = (byte) GZIPInputStream.GZIP_MAGIC; |
| private static final byte GZIP_MAGIC_SECOND_BYTE = (byte) (GZIPInputStream.GZIP_MAGIC >> 8); |
| |
| /** |
| * Looks ahead to see if the GZIP magic constant is heading {@code bytes} |
| */ |
| private boolean isGzipped(byte[] bytes) { |
| return (bytes.length > 1) && (bytes[0] == GZIP_MAGIC_FIRST_BYTE) && (bytes[1] == GZIP_MAGIC_SECOND_BYTE); |
| } |
| } |