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60 lines
2.0 KiB
60 lines
2.0 KiB
1 year ago
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// Copyright (c) Meta Platforms, Inc. and affiliates.
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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 "port/port.h"
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#include "rocksdb/advanced_cache.h"
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namespace ROCKSDB_NAMESPACE {
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class ConcurrentCacheReservationManager;
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// A cache interface which wraps around another cache and takes care of
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// reserving space in block cache towards a single global memory limit, and
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// forwards all the calls to the underlying cache.
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class ChargedCache : public CacheWrapper {
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public:
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ChargedCache(std::shared_ptr<Cache> cache,
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std::shared_ptr<Cache> block_cache);
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Status Insert(const Slice& key, ObjectPtr obj, const CacheItemHelper* helper,
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size_t charge, Handle** handle = nullptr,
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Priority priority = Priority::LOW) override;
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Cache::Handle* Lookup(const Slice& key, const CacheItemHelper* helper,
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CreateContext* create_context,
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Priority priority = Priority::LOW,
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Statistics* stats = nullptr) override;
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void WaitAll(AsyncLookupHandle* async_handles, size_t count) override;
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bool Release(Cache::Handle* handle, bool useful,
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bool erase_if_last_ref = false) override;
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bool Release(Cache::Handle* handle, bool erase_if_last_ref = false) override;
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void Erase(const Slice& key) override;
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void EraseUnRefEntries() override;
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static const char* kClassName() { return "ChargedCache"; }
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const char* Name() const override { return kClassName(); }
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void SetCapacity(size_t capacity) override;
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inline Cache* GetCache() const { return target_.get(); }
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inline ConcurrentCacheReservationManager* TEST_GetCacheReservationManager()
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const {
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return cache_res_mgr_.get();
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}
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private:
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std::shared_ptr<ConcurrentCacheReservationManager> cache_res_mgr_;
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};
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} // namespace ROCKSDB_NAMESPACE
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