lease_update_backlog.h

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// Copyright (C) 2020-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef HA_LEASE_BACKLOG_H
#define HA_LEASE_BACKLOG_H

#include <dhcpsrv/lease.h>
#include <deque>
#include <mutex>
#include <utility>

namespace isc {
namespace ha {

class LeaseUpdateBacklog {
public:

    enum OpType {
        ADD,
        DELETE
    };

    LeaseUpdateBacklog(const size_t limit);

    bool push(const OpType op_type, const dhcp::LeasePtr& lease);

    dhcp::LeasePtr pop(OpType& op_type);

    bool wasOverflown();

    void clear();

    size_t size();

private:

    bool pushInternal(const OpType op_type, const dhcp::LeasePtr& lease);

    dhcp::LeasePtr popInternal(OpType& op_type);

    size_t limit_;

    bool overflown_;

    std::deque<std::pair<OpType, dhcp::LeasePtr> > outstanding_updates_;

    std::mutex mutex_;
};

} // end of namespace isc::ha
} // end of namespace isc

#endif // HA_LEASE_BACKLOG_H