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// Copyright (c) Meta Platforms, Inc. and affiliates.
// 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 "port/port.h"
#include "rocksdb/cache.h"
namespace ROCKSDB_NAMESPACE {
class ConcurrentCacheReservationManager;
// A cache interface which wraps around another cache and takes care of
// reserving space in block cache towards a single global memory limit, and
// forwards all the calls to the underlying cache.
class ChargedCache : public Cache {
public:
ChargedCache(std::shared_ptr<Cache> cache,
std::shared_ptr<Cache> block_cache);
~ChargedCache() override = default;
Status Insert(const Slice& key, void* value, size_t charge, DeleterFn deleter,
Handle** handle, Priority priority) override;
Status Insert(const Slice& key, void* value, const CacheItemHelper* helper,
size_t charge, Handle** handle = nullptr,
Priority priority = Priority::LOW) override;
Cache::Handle* Lookup(const Slice& key, Statistics* stats) override;
Cache::Handle* Lookup(const Slice& key, const CacheItemHelper* helper,
const CreateCallback& create_cb, Priority priority,
bool wait, Statistics* stats = nullptr) override;
bool Release(Cache::Handle* handle, bool useful,
bool erase_if_last_ref = false) override;
bool Release(Cache::Handle* handle, bool erase_if_last_ref = false) override;
void Erase(const Slice& key) override;
void EraseUnRefEntries() override;
static const char* kClassName() { return "ChargedCache"; }
const char* Name() const override { return kClassName(); }
uint64_t NewId() override { return cache_->NewId(); }
void SetCapacity(size_t capacity) override;
void SetStrictCapacityLimit(bool strict_capacity_limit) override {
cache_->SetStrictCapacityLimit(strict_capacity_limit);
}
bool HasStrictCapacityLimit() const override {
return cache_->HasStrictCapacityLimit();
}
void* Value(Cache::Handle* handle) override { return cache_->Value(handle); }
bool IsReady(Cache::Handle* handle) override {
return cache_->IsReady(handle);
}
void Wait(Cache::Handle* handle) override { cache_->Wait(handle); }
void WaitAll(std::vector<Handle*>& handles) override {
cache_->WaitAll(handles);
}
bool Ref(Cache::Handle* handle) override { return cache_->Ref(handle); }
size_t GetCapacity() const override { return cache_->GetCapacity(); }
size_t GetUsage() const override { return cache_->GetUsage(); }
size_t GetUsage(Cache::Handle* handle) const override {
return cache_->GetUsage(handle);
}
size_t GetPinnedUsage() const override { return cache_->GetPinnedUsage(); }
size_t GetCharge(Cache::Handle* handle) const override {
return cache_->GetCharge(handle);
}
Cache::DeleterFn GetDeleter(Cache::Handle* handle) const override {
return cache_->GetDeleter(handle);
}
void ApplyToAllEntries(
const std::function<void(const Slice& key, void* value, size_t charge,
Cache::DeleterFn deleter)>& callback,
const Cache::ApplyToAllEntriesOptions& opts) override {
cache_->ApplyToAllEntries(callback, opts);
}
void ApplyToAllCacheEntries(void (*callback)(void* value, size_t charge),
bool thread_safe) override {
cache_->ApplyToAllCacheEntries(callback, thread_safe);
}
std::string GetPrintableOptions() const override {
return cache_->GetPrintableOptions();
}
void DisownData() override { return cache_->DisownData(); }
inline Cache* GetCache() const { return cache_.get(); }
inline ConcurrentCacheReservationManager* TEST_GetCacheReservationManager()
const {
return cache_res_mgr_.get();
}
private:
std::shared_ptr<Cache> cache_;
std::shared_ptr<ConcurrentCacheReservationManager> cache_res_mgr_;
};
} // namespace ROCKSDB_NAMESPACE
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