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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
#include "lock.hh"
class ConcurrentConnectionManager
{
public:
ConcurrentConnectionManager(size_t max)
{
setMaxConcurrentConnections(max);
}
void setMaxConcurrentConnections(size_t max)
{
d_data.lock()->d_maxConcurrentConnections = max;
}
size_t getMaxConcurrentConnections()
{
return d_data.lock()->d_maxConcurrentConnections;
}
bool registerConnection()
{
auto data = d_data.lock();
if (data->d_maxConcurrentConnections == 0 || data->d_currentConnectionsCount < data->d_maxConcurrentConnections) {
++data->d_currentConnectionsCount;
return true;
}
return false;
}
void releaseConnection()
{
--(d_data.lock()->d_currentConnectionsCount);
}
private:
struct Data {
size_t d_maxConcurrentConnections{0};
size_t d_currentConnectionsCount{0};
};
LockGuarded<Data> d_data;
};
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