| /** |
| * 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.coder; |
| |
| import org.apache.hadoop.io.erasurecode.ECBlock; |
| import org.apache.hadoop.io.erasurecode.ECBlockGroup; |
| import org.apache.hadoop.io.erasurecode.ECSchema; |
| |
| /** |
| * An abstract erasure encoder that's to be inherited by new encoders. |
| * |
| * It implements the {@link ErasureCoder} interface. |
| */ |
| public abstract class AbstractErasureEncoder extends AbstractErasureCoder { |
| |
| public AbstractErasureEncoder(int numDataUnits, int numParityUnits) { |
| super(numDataUnits, numParityUnits); |
| } |
| |
| public AbstractErasureEncoder(ECSchema schema) { |
| super(schema); |
| } |
| |
| @Override |
| public ErasureCodingStep calculateCoding(ECBlockGroup blockGroup) { |
| // We may have more than this when considering complicate cases. HADOOP-11550 |
| return prepareEncodingStep(blockGroup); |
| } |
| |
| /** |
| * Perform encoding against a block group. |
| * @param blockGroup |
| * @return encoding step for caller to do the real work |
| */ |
| protected abstract ErasureCodingStep prepareEncodingStep( |
| ECBlockGroup blockGroup); |
| |
| protected ECBlock[] getInputBlocks(ECBlockGroup blockGroup) { |
| return blockGroup.getDataBlocks(); |
| } |
| |
| protected ECBlock[] getOutputBlocks(ECBlockGroup blockGroup) { |
| return blockGroup.getParityBlocks(); |
| } |
| } |