mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-20 05:28:01 +00:00
78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_METER_HPP
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#define ZT_METER_HPP
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#include "Constants.hpp"
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#include "Mutex.hpp"
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#include "AtomicCounter.hpp"
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#define ZT_METER_HISTORY_LENGTH 4
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#define ZT_METER_HISTORY_TICK_DURATION 1000
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namespace ZeroTier {
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/**
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* Transfer rate meter (thread-safe)
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*/
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class Meter
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{
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public:
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ZT_ALWAYS_INLINE Meter()
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{
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for(int i=0;i<ZT_METER_HISTORY_LENGTH;++i)
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_history[i] = 0.0;
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_ts = 0;
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_count = 0;
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}
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template<typename I>
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ZT_ALWAYS_INLINE void log(const int64_t now,I count)
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{
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const int64_t since = now - _ts;
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if (since >= ZT_METER_HISTORY_TICK_DURATION) {
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_ts = now;
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_history[(unsigned int)(++_hptr) % ZT_METER_HISTORY_LENGTH] = (double)_count / ((double)since / 1000.0);
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_count = (uint64_t)count;
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} else {
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_count += (uint64_t)count;
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}
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}
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ZT_ALWAYS_INLINE double perSecond(const int64_t now) const
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{
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double r = 0.0,n = 0.0;
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const int64_t since = (now - _ts);
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if (since >= ZT_METER_HISTORY_TICK_DURATION) {
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r += (double)_count / ((double)since / 1000.0);
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n += 1.0;
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}
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for(int i=0;i<ZT_METER_HISTORY_LENGTH;++i) {
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r += _history[i];
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n += 1.0;
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}
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return r / n;
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}
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private:
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volatile double _history[ZT_METER_HISTORY_LENGTH];
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volatile int64_t _ts;
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volatile uint64_t _count;
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AtomicCounter _hptr;
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};
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} // namespace ZeroTier
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#endif
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