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main
util/compression_context_cache.h
47 строк
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sdong
Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)
20 фев 2020, 23:09
20 фев 2020, 23:09
fdf882d
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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). // Copyright (c) 2011 The LevelDB Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. See the AUTHORS file for names of contributors. // // Compression context cache allows to cache compression/uncompression contexts // This helps with Random Read latencies and reduces CPU utilization // Caching is implemented using CoreLocal facility. Compression/Uncompression // instances are cached on a per core basis using CoreLocalArray. A borrowed // instance is atomically replaced with a sentinel value for the time of being // used. If it turns out that another thread is already makes use of the // instance we still create one on the heap which is later is destroyed. #pragma once #include <stdint.h> #include "rocksdb/rocksdb_namespace.h" namespace ROCKSDB_NAMESPACE { class ZSTDUncompressCachedData; class CompressionContextCache { public: // Singleton static CompressionContextCache* Instance(); static void InitSingleton(); CompressionContextCache(const CompressionContextCache&) = delete; CompressionContextCache& operator=(const CompressionContextCache&) = delete; ZSTDUncompressCachedData GetCachedZSTDUncompressData(); void ReturnCachedZSTDUncompressData(int64_t idx); private: // Singleton CompressionContextCache(); ~CompressionContextCache(); class Rep; Rep* rep_; }; } // namespace ROCKSDB_NAMESPACE