library/cpp/retry/utils.cpp


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#include "utils.h"

#include <util/random/random.h>

TDuration NRetryPrivate::AddRandomDelta(TDuration maxDelta) { 
    if (maxDelta == TDuration::Zero()) {
        return TDuration::Zero(); 
    }

    const TDuration delta = TDuration::MicroSeconds(RandomNumber(2 * maxDelta.MicroSeconds()));
    return delta - maxDelta; 
}
 
TDuration NRetryPrivate::AddIncrement(ui32 attempt, TDuration increment) { 
    return TDuration::MicroSeconds(attempt * increment.MicroSeconds()); 
} 
 
TDuration NRetryPrivate::AddExponentialMultiplier(ui32 attempt, TDuration exponentialMultiplier) { 
    return TDuration::MicroSeconds((1ull << Min(63u, attempt)) * exponentialMultiplier.MicroSeconds()); 
}