fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
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46 lines
1.8 KiB
46 lines
1.8 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <string>
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#include "monitoring/statistics_impl.h"
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#include "table/format.h"
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#include "table/persistent_cache_options.h"
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namespace ROCKSDB_NAMESPACE {
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struct BlockContents;
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// PersistentCacheHelper
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//
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// Encapsulates some of the helper logic for read and writing from the cache
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class PersistentCacheHelper {
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public:
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// Insert block into cache of serialized blocks. Size includes block trailer
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// (if applicable).
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static void InsertSerialized(const PersistentCacheOptions& cache_options,
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const BlockHandle& handle, const char* data,
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const size_t size);
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// Insert block into cache of uncompressed blocks. No block trailer.
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static void InsertUncompressed(const PersistentCacheOptions& cache_options,
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const BlockHandle& handle,
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const BlockContents& contents);
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// Lookup block from cache of serialized blocks. Size includes block trailer
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// (if applicable).
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static Status LookupSerialized(const PersistentCacheOptions& cache_options,
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const BlockHandle& handle,
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std::unique_ptr<char[]>* out_data,
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const size_t expected_data_size);
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// Lookup block from uncompressed cache. No block trailer.
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static Status LookupUncompressed(const PersistentCacheOptions& cache_options,
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const BlockHandle& handle,
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BlockContents* contents);
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};
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} // namespace ROCKSDB_NAMESPACE
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