001/* 002 * (C) Copyright 2018 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * bdelbosc 018 */ 019package org.nuxeo.lib.stream.codec; 020 021import java.io.IOException; 022 023import org.apache.avro.Schema; 024import org.apache.avro.message.BadHeaderException; 025import org.apache.avro.message.BinaryMessageDecoder; 026import org.apache.avro.message.BinaryMessageEncoder; 027import org.apache.avro.message.SchemaStore; 028import org.apache.avro.reflect.ReflectData; 029 030/** 031 * Avro Single object encoding: magic 2 bytes + schema fingerprint 8 bytes + avro binary. See 032 * https://avro.apache.org/docs/current/spec.html#single_object_encoding When using a SchemaStore the writer and reader 033 * schemas can evolve. 034 * 035 * @since 10.2 036 */ 037public class AvroMessageCodec<T> implements Codec<T> { 038 public static final String NAME = "avro"; 039 040 protected final Class<T> messageClass; 041 042 protected final Schema schema; 043 044 protected final BinaryMessageEncoder<T> encoder; 045 046 protected final BinaryMessageDecoder<T> decoder; 047 048 public AvroMessageCodec(Class<T> messageClass, SchemaStore store) { 049 this.messageClass = messageClass; 050 schema = ReflectData.get().getSchema(messageClass); 051 encoder = new BinaryMessageEncoder<>(ReflectData.get(), schema); 052 decoder = new BinaryMessageDecoder<>(ReflectData.get(), schema, store); 053 } 054 055 public AvroMessageCodec(Class<T> messageClass) { 056 this(messageClass, null); 057 } 058 059 @Override 060 public String getName() { 061 return NAME; 062 } 063 064 @Override 065 public byte[] encode(T object) { 066 try { 067 return encoder.encode(object).array(); 068 } catch (IOException e) { 069 throw new IllegalArgumentException(e); 070 } 071 } 072 073 @Override 074 public T decode(byte[] data) { 075 try { 076 return decoder.decode(data, null); 077 } catch (IOException | BadHeaderException e) { 078 throw new IllegalArgumentException(e); 079 } 080 } 081}