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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
class ExponentialBackOffTimer
{
public:
ExponentialBackOffTimer(unsigned int maxBackOff) :
d_maxBackOff(maxBackOff)
{
}
unsigned int get(size_t consecutiveFailures) const
{
unsigned int backOff = d_maxBackOff;
if (consecutiveFailures <= 31) {
backOff = 1U << consecutiveFailures;
backOff = std::min(d_maxBackOff, backOff);
}
return backOff;
}
private:
const unsigned int d_maxBackOff;
};
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