hadoop DefaultSerializer 源码
haddop DefaultSerializer 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/DefaultSerializer.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.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.Writable;
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class DefaultSerializer implements INativeSerializer<Writable> {
static class ModifiedByteArrayOutputStream extends ByteArrayOutputStream {
public byte[] getBuffer() {
return this.buf;
}
}
private final ModifiedByteArrayOutputStream outBuffer = new ModifiedByteArrayOutputStream();
private final DataOutputStream outData = new DataOutputStream(outBuffer);
private Writable buffered = null;
private int bufferedLength = -1;
@Override
public int getLength(Writable w) throws IOException {
// if (w == buffered) {
// return bufferedLength;
// }
buffered = null;
bufferedLength = -1;
outBuffer.reset();
w.write(outData);
bufferedLength = outBuffer.size();
buffered = w;
return bufferedLength;
}
@Override
public void serialize(Writable w, DataOutput out) throws IOException {
w.write(out);
}
@Override
public void deserialize(DataInput in, int length, Writable w) throws IOException {
w.readFields(in);
}
}
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