hadoop INativeSerializer 源码
haddop INativeSerializer 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/serde/INativeSerializer.java
/**
* 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;
}
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