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// 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
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