/**
* 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.util;
import java.nio.ByteBuffer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class NativeJerasure {
public static final Log LOG = LogFactory.getLog(NativeJerasure.class);
/**
* Return true if the JNI-based native Jerasure extensions are available.
*/
public static boolean isAvailable() {
return NativeCodeLoader.isNativeCodeLoaded();
}
public static native void nativeInit(int stripeSize, int paritySize);
public static void encodeBulk(byte[][] inputs, byte[][] outputs,
int stripeSize, int paritySize) {
ByteBuffer[] inputBuffers = new ByteBuffer[inputs.length];
ByteBuffer[] outputBuffers = new ByteBuffer[outputs.length];
int bufferLen = inputs[0].length;
for (int i = 0; i < outputs.length; i++) {
outputBuffers[i] = ByteBuffer.allocateDirect(bufferLen);
}
for (int i = 0; i < inputs.length; i++) {
inputBuffers[i] = directify(inputs[i], 0, bufferLen);
}
nativeEncodeBulk(inputBuffers, outputBuffers, stripeSize, paritySize, bufferLen);
for (int i = 0; i < outputs.length; i++) {
outputBuffers[i].get(outputs[i]);
}
}
private static native void nativeEncodeBulk(ByteBuffer[] inputBuffers,
ByteBuffer[] outputBuffers, int stripeSize, int paritySize, int dataLen);
public static void decodeBulk(byte[][] readBufs, byte[][] writeBufs,
int[] erasedLocation, int dataStart, int dataLen, int stripeSize,
int paritySize) {
ByteBuffer[] inputBuffers = new ByteBuffer[readBufs.length];
ByteBuffer[] outputBuffers = new ByteBuffer[writeBufs.length];
for (int i = 0; i < writeBufs.length; i++) {
outputBuffers[i] = ByteBuffer.allocateDirect(dataLen);
}
for (int i = 0; i < readBufs.length; i++) {
inputBuffers[i] = directify(readBufs[i], dataStart, dataLen);
}
nativeDecodeBulk(inputBuffers, outputBuffers, erasedLocation,
dataLen, stripeSize, paritySize, erasedLocation.length);
for (int i = 0; i < writeBufs.length; i++) {
outputBuffers[i].get(writeBufs[i], dataStart, dataLen);
}
}
private static native void nativeDecodeBulk(ByteBuffer[] inputBuffers,
ByteBuffer[] outputBuffers, int[] erasedLocation, int dataLen,
int stripeSize, int paritySize, int erasedLocationCount);
private static ByteBuffer directify(byte[] readBufs, int dataStart, int dataLen) {
ByteBuffer newBuf = null;
newBuf = ByteBuffer.allocateDirect(dataLen);
newBuf.position(0);
newBuf.mark();
newBuf.put(readBufs, dataStart, dataLen);
newBuf.reset();
newBuf.limit(dataLen);
return newBuf;
}
}