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