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#pragma once
#include "byte_size.h"
#include <library/cpp/threading/future/future.h>
#include <util/generic/ptr.h>
#include <util/datetime/base.h>
namespace NSQLComplete {
namespace NPrivate {
template <class T>
concept CHashable = requires(const T& x) {
{ THash<T>()(x) } -> std::convertible_to<std::size_t>;
};
template <class T>
concept CCacheKey = std::regular<T> && CHashable<T> && CByteSized<T>;
template <class T>
concept CCacheValue = std::copyable<T> && CByteSized<T>;
}; // namespace NPrivate
template <NPrivate::CCacheKey TKey, NPrivate::CCacheValue TValue>
class ICache: public TThrRefBase {
public:
using TPtr = TIntrusivePtr<ICache>;
struct TEntry {
TMaybe<TValue> Value = Nothing();
bool IsExpired = true;
};
~ICache() override = default;
virtual NThreading::TFuture<TEntry> Get(const TKey& key) const = 0;
virtual NThreading::TFuture<void> Update(const TKey& key, TValue value) const = 0;
};
} // namespace NSQLComplete
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