hadoop OutputBuffer 源码
haddop OutputBuffer 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/buffer/OutputBuffer.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.buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import org.apache.hadoop.classification.InterfaceAudience;
@InterfaceAudience.Private
public class OutputBuffer {
protected ByteBuffer byteBuffer;
private final BufferType type;
public OutputBuffer(BufferType type, int outputBufferCapacity) {
this.type = type;
if (outputBufferCapacity > 0) {
switch (type) {
case DIRECT_BUFFER:
this.byteBuffer = ByteBuffer.allocateDirect(outputBufferCapacity);
this.byteBuffer.order(ByteOrder.BIG_ENDIAN);
break;
case HEAP_BUFFER:
this.byteBuffer = ByteBuffer.allocate(outputBufferCapacity);
this.byteBuffer.order(ByteOrder.BIG_ENDIAN);
break;
}
}
}
public OutputBuffer(byte[] bytes) {
this.type = BufferType.HEAP_BUFFER;
final int outputBufferCapacity = bytes.length;
if (outputBufferCapacity > 0) {
this.byteBuffer = ByteBuffer.wrap(bytes);
this.byteBuffer.order(ByteOrder.BIG_ENDIAN);
this.byteBuffer.position(0);
}
}
public BufferType getType() {
return this.type;
}
public ByteBuffer getByteBuffer() {
return this.byteBuffer;
}
public int length() {
return byteBuffer.position();
}
public void rewind() {
byteBuffer.position(0);
}
public int limit() {
return byteBuffer.limit();
}
}
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