64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include <string>
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#include "table/block_based_table_reader.h"
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#include "util/statistics.h"
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namespace rocksdb {
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struct BlockContents;
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// PersistentCacheOptions
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//
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// This describe the caching behavior for page cache
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// This is used to pass the context for caching and the cache handle
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struct PersistentCacheOptions {
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PersistentCacheOptions() {}
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explicit PersistentCacheOptions(
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const std::shared_ptr<PersistentCache>& _persistent_cache,
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const std::string _key_prefix, Statistics* const _statistics)
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: persistent_cache(_persistent_cache),
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key_prefix(_key_prefix),
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statistics(_statistics) {}
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virtual ~PersistentCacheOptions() {}
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std::shared_ptr<PersistentCache> persistent_cache;
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std::string key_prefix;
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Statistics* statistics = nullptr;
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};
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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 raw page cache
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static void InsertRawPage(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 uncompressed cache
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static void InsertUncompressedPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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const BlockContents& contents);
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// lookup block from raw page cacge
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static Status LookupRawPage(const PersistentCacheOptions& cache_options,
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const BlockHandle& handle,
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std::unique_ptr<char[]>* raw_data,
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const size_t raw_data_size);
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// lookup block from uncompressed cache
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static Status LookupUncompressedPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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BlockContents* contents);
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};
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} // namespace rocksdb
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