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rocksdb

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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.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