hadoop NativeRSRawEncoder 源码
haddop NativeRSRawEncoder 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/rawcoder/NativeRSRawEncoder.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.io.erasurecode.rawcoder;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.io.erasurecode.ErasureCodeNative;
import org.apache.hadoop.io.erasurecode.ErasureCoderOptions;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* A Reed-Solomon raw encoder using Intel ISA-L library.
*/
@InterfaceAudience.Private
public class NativeRSRawEncoder extends AbstractNativeRawEncoder {
static {
ErasureCodeNative.checkNativeCodeLoaded();
}
public NativeRSRawEncoder(ErasureCoderOptions coderOptions) {
super(coderOptions);
encoderLock.writeLock().lock();
try {
initImpl(coderOptions.getNumDataUnits(),
coderOptions.getNumParityUnits());
} finally {
encoderLock.writeLock().unlock();
}
}
@Override
protected void performEncodeImpl(
ByteBuffer[] inputs, int[] inputOffsets, int dataLen,
ByteBuffer[] outputs, int[] outputOffsets) throws IOException {
encodeImpl(inputs, inputOffsets, dataLen, outputs, outputOffsets);
}
@Override
public void release() {
encoderLock.writeLock().lock();
try {
destroyImpl();
} finally {
encoderLock.writeLock().unlock();
}
}
@Override
public boolean preferDirectBuffer() {
return true;
}
private native void initImpl(int numDataUnits, int numParityUnits);
private native void encodeImpl(ByteBuffer[] inputs, int[] inputOffsets,
int dataLen, ByteBuffer[] outputs,
int[] outputOffsets) throws IOException;
private native void destroyImpl();
}
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