| /** |
| * 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.mapred.nativetask.serde; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * an INativeSerializer serializes and deserializes data transferred between |
| * Java and native. {@link DefaultSerializer} provides default implementations. |
| * |
| * Note: if you implemented your customized NativeSerializer instead of DefaultSerializer, |
| * you have to make sure the native side can serialize it correctly. |
| * |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface INativeSerializer<T> { |
| |
| /** |
| * get length of data to be serialized. If the data length is already known (like IntWritable) |
| * and could immediately be returned from this method, it is good chance to implement customized |
| * NativeSerializer for efficiency |
| */ |
| public int getLength(T w) throws IOException; |
| |
| public void serialize(T w, DataOutput out) throws IOException; |
| |
| public void deserialize(DataInput in, int length, T w) throws IOException; |
| } |
