| /** |
| * 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.ErasureCoderOptions; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Abstract native raw decoder for all native coders to extend with. |
| */ |
| @InterfaceAudience.Private |
| abstract class AbstractNativeRawDecoder extends RawErasureDecoder { |
| public static Logger LOG = |
| LoggerFactory.getLogger(AbstractNativeRawDecoder.class); |
| |
| public AbstractNativeRawDecoder(ErasureCoderOptions coderOptions) { |
| super(coderOptions); |
| } |
| |
| @Override |
| protected void doDecode(ByteBufferDecodingState decodingState) { |
| int[] inputOffsets = new int[decodingState.inputs.length]; |
| int[] outputOffsets = new int[decodingState.outputs.length]; |
| |
| ByteBuffer buffer; |
| for (int i = 0; i < decodingState.inputs.length; ++i) { |
| buffer = decodingState.inputs[i]; |
| if (buffer != null) { |
| inputOffsets[i] = buffer.position(); |
| } |
| } |
| |
| for (int i = 0; i < decodingState.outputs.length; ++i) { |
| buffer = decodingState.outputs[i]; |
| outputOffsets[i] = buffer.position(); |
| } |
| |
| performDecodeImpl(decodingState.inputs, inputOffsets, |
| decodingState.decodeLength, decodingState.erasedIndexes, |
| decodingState.outputs, outputOffsets); |
| } |
| |
| protected abstract void performDecodeImpl(ByteBuffer[] inputs, |
| int[] inputOffsets, int dataLen, |
| int[] erased, ByteBuffer[] outputs, |
| int[] outputOffsets); |
| |
| @Override |
| protected void doDecode(ByteArrayDecodingState decodingState) { |
| LOG.warn("convertToByteBufferState is invoked, " + |
| "not efficiently. Please use direct ByteBuffer inputs/outputs"); |
| |
| ByteBufferDecodingState bbdState = decodingState.convertToByteBufferState(); |
| doDecode(bbdState); |
| |
| for (int i = 0; i < decodingState.outputs.length; i++) { |
| bbdState.outputs[i].get(decodingState.outputs[i], |
| decodingState.outputOffsets[i], decodingState.decodeLength); |
| } |
| } |
| |
| // To link with the underlying data structure in the native layer. |
| // No get/set as only used by native codes. |
| private long nativeCoder; |
| } |