73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
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#ifndef GBC_MEMORY_HPP_032N8PRJ
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#define GBC_MEMORY_HPP_032N8PRJ
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#include <vanetza/geonet/cbf_packet_identifier.hpp>
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#include <boost/multi_index_container.hpp>
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#include <boost/multi_index/hashed_index.hpp>
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#include <boost/multi_index/sequenced_index.hpp>
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namespace vanetza
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{
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namespace geonet
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{
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/**
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* GbcMemory remembers previously seens GBC packets.
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*
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* GBC packets are identified by their (GN addr, sequence number) tuple.
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* The size of GbcMemory is bounded, i.e. it will forget old packets in favour of recent ones.
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*/
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class GbcMemory
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{
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public:
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using PacketIdentifier = CbfPacketIdentifier;
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/**
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* Forget a packet if memory exceeds upper limit of stored identifiers
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* \param num upper limit of remembered packets
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*/
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void capacity(std::size_t num);
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/**
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* Number of currently known packets
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* \return number of packets
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*/
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std::size_t size() const;
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/**
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* Remember a particular packet
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* \param id packet identifier
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* \return true if packet is already known
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*/
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bool remember(const PacketIdentifier& id);
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/**
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* Check if a particular packet is known
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* \param id packet identifier
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* \return true if packet is known
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*/
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bool knows(const PacketIdentifier& id) const;
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private:
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std::size_t m_capacity = 1;
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struct by_packet {};
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using packet_index = boost::multi_index::hashed_unique<
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boost::multi_index::tag<by_packet>,
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boost::multi_index::identity<PacketIdentifier>,
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std::hash<PacketIdentifier>
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>;
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struct by_queue {};
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using queue_index = boost::multi_index::sequenced<boost::multi_index::tag<by_queue>>;
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using container_type = boost::multi_index_container<PacketIdentifier,
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boost::multi_index::indexed_by<queue_index, packet_index>>;
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container_type m_identifiers;
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};
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} // namespace geonet
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} // namespace vanetza
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#endif /* GBC_MEMORY_HPP_032N8PRJ */
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