MutableCachePersistentStorageMgr.h

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/*
 * Copyright 2020 OmniSci, Inc.
 *
 * Licensed 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.
 */

#pragma once

#include "PersistentStorageMgr.h"

/*
  A PersistentStorageMgr with additional functionality for caching mutable tables to disk.
 */
class MutableCachePersistentStorageMgr : public PersistentStorageMgr {
 public:
  MutableCachePersistentStorageMgr(const std::string& data_dir,
                                   const size_t num_reader_threads,
                                   const DiskCacheConfig& disk_cache_config);
  AbstractBuffer* createBuffer(const ChunkKey& chunk_key,
                               const size_t page_size,
                               const size_t initial_size) override;
  void deleteBuffer(const ChunkKey& chunk_key, const bool purge) override;
  void deleteBuffersWithPrefix(const ChunkKey& chunk_key_prefix,
                               const bool purge) override;
  AbstractBuffer* putBuffer(const ChunkKey& chunk_key,
                            AbstractBuffer* source_buffer,
                            const size_t num_bytes) override;
  void checkpoint() override;
  void checkpoint(const int db_id, const int tb_id) override;
  void removeTableRelatedDS(const int db_id, const int table_id) override;

 private:
  std::map<const ChunkKey, AbstractBuffer*> cached_buffer_map_;
};