| // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. |
| // This source code is licensed under both the GPLv2 (found in the |
| // COPYING file in the root directory) and Apache 2.0 License |
| // (found in the LICENSE.Apache file in the root directory). |
| #pragma once |
| |
| #include <string> |
| |
| #include "monitoring/statistics.h" |
| #include "table/format.h" |
| #include "table/persistent_cache_options.h" |
| |
| namespace rocksdb { |
| |
| struct BlockContents; |
| |
| // PersistentCacheHelper |
| // |
| // Encapsulates some of the helper logic for read and writing from the cache |
| class PersistentCacheHelper { |
| public: |
| // insert block into raw page cache |
| static void InsertRawPage(const PersistentCacheOptions& cache_options, |
| const BlockHandle& handle, const char* data, |
| const size_t size); |
| |
| // insert block into uncompressed cache |
| static void InsertUncompressedPage( |
| const PersistentCacheOptions& cache_options, const BlockHandle& handle, |
| const BlockContents& contents); |
| |
| // lookup block from raw page cacge |
| static Status LookupRawPage(const PersistentCacheOptions& cache_options, |
| const BlockHandle& handle, |
| std::unique_ptr<char[]>* raw_data, |
| const size_t raw_data_size); |
| |
| // lookup block from uncompressed cache |
| static Status LookupUncompressedPage( |
| const PersistentCacheOptions& cache_options, const BlockHandle& handle, |
| BlockContents* contents); |
| }; |
| |
| } // namespace rocksdb |