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/*
* This file is part of LibEuFin.
* Copyright (C) 2023 Taler Systems S.A.
* LibEuFin is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
* LibEuFin is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General
* Public License for more details.
* You should have received a copy of the GNU Affero General Public
* License along with LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.common
import kotlin.random.Random
/** Infinite exponential backoff with decorrelated jitter */
class ExpoBackoffDecorr(
private val base: Long = 100, // 0.1 second
private val max: Long = 5000, // 5 second
private val factor: Double = 2.0,
) {
private var sleep: Long = base
fun next() : Long {
sleep = Random.nextDouble(base.toDouble(), sleep.toDouble() * factor)
.toLong().coerceAtMost(max)
return sleep
}
fun reset() {
sleep = base
}
}
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