Duckstation/dep/discord-rpc/src/backoff.h

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2020-04-30 15:01:42 +00:00
#pragma once
#include <algorithm>
#include <random>
#include <stdint.h>
#include <time.h>
struct Backoff {
int64_t minAmount;
int64_t maxAmount;
int64_t current;
int fails;
std::mt19937_64 randGenerator;
std::uniform_real_distribution<> randDistribution;
double rand01() { return randDistribution(randGenerator); }
Backoff(int64_t min, int64_t max)
: minAmount(min)
, maxAmount(max)
, current(min)
, fails(0)
, randGenerator((uint64_t)time(0))
{
}
void reset()
{
fails = 0;
current = minAmount;
}
int64_t nextDelay()
{
++fails;
int64_t delay = (int64_t)((double)current * 2.0 * rand01());
current = std::min(current + delay, maxAmount);
return current;
}
};