org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawDecoder.java Source code

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Here is the source code for org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawDecoder.java

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/**
 * 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 decoder using Intel ISA-L library.
 */
@InterfaceAudience.Private
public class NativeRSRawDecoder extends AbstractNativeRawDecoder {

    static {
        ErasureCodeNative.checkNativeCodeLoaded();
    }

    public NativeRSRawDecoder(ErasureCoderOptions coderOptions) {
        super(coderOptions);
        decoderLock.writeLock().lock();
        try {
            initImpl(coderOptions.getNumDataUnits(), coderOptions.getNumParityUnits());
        } finally {
            decoderLock.writeLock().unlock();
        }
    }

    @Override
    protected void performDecodeImpl(ByteBuffer[] inputs, int[] inputOffsets, int dataLen, int[] erased,
            ByteBuffer[] outputs, int[] outputOffsets) throws IOException {
        decodeImpl(inputs, inputOffsets, dataLen, erased, outputs, outputOffsets);
    }

    @Override
    public void release() {
        decoderLock.writeLock().lock();
        try {
            destroyImpl();
        } finally {
            decoderLock.writeLock().unlock();
        }
    }

    @Override
    public boolean preferDirectBuffer() {
        return true;
    }

    private native void initImpl(int numDataUnits, int numParityUnits);

    private native void decodeImpl(ByteBuffer[] inputs, int[] inputOffsets, int dataLen, int[] erased,
            ByteBuffer[] outputs, int[] outputOffsets) throws IOException;

    private native void destroyImpl();

}