| /** |
| * 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.ECChunk; |
| |
| /** |
| * Erasure coding step that's involved in encoding/decoding of a block group. |
| */ |
| public interface ErasureCodingStep { |
| |
| /** |
| * Input blocks of readable data involved in this step, may be data blocks |
| * or parity blocks. |
| * @return input blocks |
| */ |
| public ECBlock[] getInputBlocks(); |
| |
| /** |
| * Output blocks of writable buffers involved in this step, may be data |
| * blocks or parity blocks. |
| * @return output blocks |
| */ |
| public ECBlock[] getOutputBlocks(); |
| |
| /** |
| * Perform encoding or decoding given the input chunks, and generated results |
| * will be written to the output chunks. |
| * @param inputChunks |
| * @param outputChunks |
| */ |
| public void performCoding(ECChunk[] inputChunks, ECChunk[] outputChunks); |
| |
| /** |
| * Notify erasure coder that all the chunks of input blocks are processed so |
| * the coder can be able to update internal states, considering next step. |
| */ |
| public void finish(); |
| } |