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31 lines
767 B
C++
31 lines
767 B
C++
#pragma once
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#include <atomic>
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#include <memory>
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namespace DB
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{
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/// This class helps to calculate rows_before_limit_at_least.
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class RowsBeforeLimitCounter
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{
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public:
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void add(uint64_t rows)
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{
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setAppliedLimit();
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rows_before_limit.fetch_add(rows, std::memory_order_release);
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}
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uint64_t get() const { return rows_before_limit.load(std::memory_order_acquire); }
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void setAppliedLimit() { has_applied_limit.store(true, std::memory_order::release); }
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bool hasAppliedLimit() const { return has_applied_limit.load(std::memory_order_acquire); }
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private:
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std::atomic<uint64_t> rows_before_limit = 0;
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std::atomic_bool has_applied_limit = false;
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};
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using RowsBeforeLimitCounterPtr = std::shared_ptr<RowsBeforeLimitCounter>;
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}
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