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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_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
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