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61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
#pragma once
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#include <algorithm>
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#include <chrono>
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namespace chatterino {
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// Yes, you can't specify the base 😎 deal with it
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template <unsigned maxSteps>
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class ExponentialBackoff
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{
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public:
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/**
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* Creates an object helping you make exponentially (with base 2) backed off times.
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*
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* @param start The start time in milliseconds
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* @param maxSteps The max number of progressions we will take before stopping
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*
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* For example, ExponentialBackoff(10ms, 3) would have the next() function return 10ms, 20ms, 40ms, 40ms, ..., 40ms
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**/
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ExponentialBackoff(const std::chrono::milliseconds &start)
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: start_(start)
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, step_{1}
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{
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static_assert(maxSteps > 1, "maxSteps must be higher than 1");
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}
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/**
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* Return the current number in the progression and increment the step until the next one (assuming we're not at the cap)
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*
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* @returns current step in milliseconds
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**/
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[[nodiscard]] std::chrono::milliseconds next()
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{
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auto next = this->start_ * (1 << (this->step_ - 1));
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this->step_ += 1;
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if (this->step_ >= maxSteps)
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{
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this->step_ = maxSteps;
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}
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return next;
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}
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/**
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* Reset the progression back to its initial state
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**/
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void reset()
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{
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this->step_ = 1;
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}
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private:
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const std::chrono::milliseconds start_;
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unsigned step_;
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};
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} // namespace chatterino
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