114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
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#ifndef CBF_COUNTER_HPP_QTMUOGJS
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#define CBF_COUNTER_HPP_QTMUOGJS
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#include <vanetza/common/clock.hpp>
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#include <vanetza/geonet/cbf_packet_identifier.hpp>
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#include <vanetza/geonet/soft_state_map.hpp>
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#include <cstddef>
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#include <unordered_map>
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namespace vanetza
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{
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// forward declaration
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class Runtime;
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namespace geonet
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{
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/**
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* Interface for duplicate packet counters.
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* This is used by the Contention Based Forwarding (CBF) packet buffer.
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*/
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class CbfCounter
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{
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public:
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using id_type = CbfPacketIdentifier;
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using counter_type = std::size_t;
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/**
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* Packet has been added to buffer
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* \param id packet identifier
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*/
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virtual void add(const id_type& id) = 0;
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/**
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* Packet has been removed from buffer.
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* \param id packet identifier
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*/
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virtual void remove(const id_type& id) = 0;
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/**
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* Increment packet counter by one
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* \param id packet identifier
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*/
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virtual void increment(const id_type& id) = 0;
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/**
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* Retrieve counter value
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* \param id packet identifier
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*/
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virtual counter_type counter(const id_type& id) const = 0;
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virtual ~CbfCounter() = default;
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};
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/**
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* Immortal CBF counters, i.e. they never expire.
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* \note Be aware, memory consumption is constantly growing of this implemenation!
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*/
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class CbfCounterImmortal : public virtual CbfCounter
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{
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public:
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void add(const id_type&) override;
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void remove(const id_type&) override {}
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void increment(const id_type&) override;
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counter_type counter(const id_type&) const override;
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protected:
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std::unordered_map<id_type, counter_type> m_counters;
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};
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/**
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* Remembers only counter values for packets currently contending, i.e. stored in CBF buffer.
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* \note This is the ADVANCED routing behaviour of EN 302 636-4-1 v1.2.1
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*/
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class CbfCounterContending : public virtual CbfCounter, private CbfCounterImmortal
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{
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public:
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void add(const id_type&) override;
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void remove(const id_type&) override;
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};
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/**
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* Fading CBF counters
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*
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* Counters are removed from the internal table only after expiry, i.e. they are soft-state.
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* This fixes some serious GN flooding due to ADVANCED routing, see CbfCounterContending.
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*/
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class CbfCounterFading : public virtual CbfCounter
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{
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public:
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/*
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* Initialize fading counters
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* \param rt runtime used for soft-state behaviour
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* \param lifetime newly added counters are initialized with this lifetime
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*/
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CbfCounterFading(Runtime&, Clock::duration lifetime);
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void add(const id_type&) override;
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void remove(const id_type&) override {}
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void increment(const id_type&) override;
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counter_type counter(const id_type&) const override;
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private:
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SoftStateMap<id_type, counter_type> m_counters;
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};
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} // namespace geonet
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} // namespace vanetza
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#endif /* CBF_COUNTER_HPP_QTMUOGJS */
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