hadoop SizedWritable 源码
haddop SizedWritable 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/util/SizedWritable.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.util;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.util.ReflectionUtils;
@InterfaceAudience.Private
public class SizedWritable<T> {
public static final int INVALID_LENGTH = -1;
public int length = INVALID_LENGTH;
public Writable v;
public SizedWritable(Class<?> klass) {
if (null != klass) {
v = (Writable) ReflectionUtils.newInstance(klass, null);
}
length = INVALID_LENGTH;
}
public void readFields(DataInputBuffer key) throws IOException {
if (null != key) {
this.v.readFields(key);
this.length = INVALID_LENGTH;
} else {
throw new IOException("input key is null");
}
}
public void reset(T w) {
this.v = (Writable) w;
this.length = INVALID_LENGTH;
}
}
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