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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.ozone.container.common.interfaces;
import org.apache.hadoop.hdds.scm.container.common.helpers.Pipeline;
import org.apache.hadoop.hdds.scm.container.common.helpers
.StorageContainerException;
import org.apache.hadoop.hdds.protocol.proto.ContainerProtos;
import org.apache.hadoop.ozone.container.common.helpers.ChunkInfo;
/**
* Chunk Manager allows read, write, delete and listing of chunks in
* a container.
*/
public interface ChunkManager {
/**
* writes a given chunk.
* @param pipeline - Name and the set of machines that make this container.
* @param keyName - Name of the Key.
* @param info - ChunkInfo.
* @param stage - Chunk Stage write.
* @throws StorageContainerException
*/
void writeChunk(Pipeline pipeline, String keyName,
ChunkInfo info, byte[] data, ContainerProtos.Stage stage)
throws StorageContainerException;
/**
* reads the data defined by a chunk.
* @param pipeline - container pipeline.
* @param keyName - Name of the Key
* @param info - ChunkInfo.
* @return byte array
* @throws StorageContainerException
*
* TODO: Right now we do not support partial reads and writes of chunks.
* TODO: Explore if we need to do that for ozone.
*/
byte[] readChunk(Pipeline pipeline, String keyName, ChunkInfo info) throws
StorageContainerException;
/**
* Deletes a given chunk.
* @param pipeline - Pipeline.
* @param keyName - Key Name
* @param info - Chunk Info
* @throws StorageContainerException
*/
void deleteChunk(Pipeline pipeline, String keyName, ChunkInfo info) throws
StorageContainerException;
// TODO : Support list operations.
/**
* Shutdown the chunkManager.
*/
void shutdown();
}
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