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RocksDB for Erlang

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rocksdb deps rocksdb table persistent_cache_helper.h
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deps/rocksdb/table/persistent_cache_helper.h 

//  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_impl.h"

#include "table/format.h"

#include "table/persistent_cache_options.h"



namespace ROCKSDB_NAMESPACE {



struct BlockContents;



// PersistentCacheHelper

//

// Encapsulates  some of the helper logic for read and writing from the cache

class PersistentCacheHelper {

 public:

  // Insert block into cache of serialized blocks. Size includes block trailer

  // (if applicable).

  static void InsertSerialized(const PersistentCacheOptions& cache_options,

                               const BlockHandle& handle, const char* data,

                               const size_t size);



  // Insert block into cache of uncompressed blocks. No block trailer.

  static void InsertUncompressed(const PersistentCacheOptions& cache_options,

                                 const BlockHandle& handle,

                                 const BlockContents& contents);



  // Lookup block from cache of serialized blocks. Size includes block trailer

  // (if applicable).

  static Status LookupSerialized(const PersistentCacheOptions& cache_options,

                                 const BlockHandle& handle,

                                 std::unique_ptr<char[]>* out_data,

                                 const size_t expected_data_size);



  // Lookup block from uncompressed cache. No block trailer.

  static Status LookupUncompressed(const PersistentCacheOptions& cache_options,

                                   const BlockHandle& handle,

                                   BlockContents* contents);

};



}  // namespace ROCKSDB_NAMESPACE