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#pragma once
#include <util/generic/hash.h>
#include <util/datetime/base.h>
#include <queue>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
//! Maintains a set of items that expire after a certain time.
template <class TItem, class THash = THash<TItem>, class TEqual = TEqualTo<TItem>>
class TExpiringSet
{
public:
void SetTTl(TDuration ttl);
void Insert(TInstant now, const TItem& item);
template <class TItems>
void InsertMany(TInstant now, const TItems& items);
void Expire(TInstant now);
void Clear();
template <class TItemLike>
bool Contains(const TItemLike& item) const;
int GetSize() const;
private:
TDuration TTl_;
struct TItemPack
{
std::vector<TItem> Items;
TInstant Deadline;
bool operator<(const TItemPack& other) const;
};
THashMap<TItem, TInstant, THash, TEqual> ItemToDeadline_;
std::priority_queue<TItemPack> ExpirationQueue_;
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
#define EXPIRING_SET_INL_H_
#include "expiring_set-inl.h"
#undef EXPIRING_SET_INL_H_
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