| /** |
| * 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.hadoop.io.serial.lib.protobuf; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import com.google.protobuf.Message; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.serial.RawComparator; |
| import org.apache.hadoop.io.serial.TypedSerialization; |
| |
| /** |
| * A binding for Protocol Buffer serialization. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class ProtoBufSerialization extends TypedSerialization<Message>{ |
| private Method builderFactory; |
| |
| public ProtoBufSerialization() {} |
| public ProtoBufSerialization(Class<? extends Message> cls) { |
| super(cls); |
| setBuilderFactory(cls); |
| } |
| |
| @Override |
| public ProtoBufSerialization clone() { |
| ProtoBufSerialization result = (ProtoBufSerialization) super.clone(); |
| result.builderFactory = builderFactory; |
| return result; |
| } |
| |
| @Override |
| public Class<Message> getBaseType() { |
| return Message.class; |
| } |
| |
| private void setBuilderFactory(Class<? extends Message> cls) { |
| if (cls == null) { |
| builderFactory = null; |
| } else { |
| try { |
| builderFactory = cls.getDeclaredMethod("parseFrom", |
| InputStream.class); |
| } catch (NoSuchMethodException nsme) { |
| throw new IllegalArgumentException("Can't find parseFrom in " + |
| cls.getName()); |
| } |
| } |
| } |
| |
| @Override |
| public void setSpecificType(Class<? extends Message> cls) { |
| super.setSpecificType(cls); |
| setBuilderFactory(cls); |
| } |
| |
| @Override |
| public Message deserialize(InputStream stream, Message reusableObject, |
| Configuration conf) throws IOException { |
| try { |
| return (Message) builderFactory.invoke(null, stream); |
| } catch (IllegalAccessException e) { |
| throw new IllegalArgumentException("can't access parseFrom " + |
| " on " + getSpecificType().getName()); |
| } catch (InvocationTargetException e) { |
| throw new IllegalArgumentException("can't invoke parseFrom " + |
| " on " + getSpecificType().getName()); |
| } |
| } |
| |
| @Override |
| public RawComparator getRawComparator() { |
| return new ProtoBufComparator(getSpecificType()); |
| } |
| |
| @Override |
| public void serialize(OutputStream stream, |
| Message object) throws IOException { |
| if (specificType != object.getClass()) { |
| throw new IOException("Type mismatch in serialization: expected " |
| + specificType + "; received " + object.getClass()); |
| } |
| object.writeTo(stream); |
| } |
| |
| @Override |
| public String getName() { |
| return "protobuf"; |
| } |
| } |