72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
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#include <vanetza/common/runtime.hpp>
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#include <vanetza/dcc/burst_budget.hpp>
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#include <cassert>
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namespace vanetza
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{
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namespace dcc
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{
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namespace
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{
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// these constants are given in C2C-CC Basic System Profile (last v1.3.0)
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constexpr Clock::duration T_Burst = std::chrono::seconds(1);
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constexpr Clock::duration T_BurstPeriod = std::chrono::seconds(10);
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constexpr std::size_t N_Burst = 20;
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} // namespace
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BurstBudget::BurstBudget(const Runtime& rt) :
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m_runtime(rt), m_messages(N_Burst), m_burst_duration(T_Burst), m_burst_period(T_BurstPeriod)
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{
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}
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BurstBudget::~BurstBudget()
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{
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}
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Clock::duration BurstBudget::delay()
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{
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assert(m_burst_duration < m_burst_period);
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Clock::duration delay = Clock::duration::max();
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if (m_messages.empty()) {
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delay = Clock::duration::zero();
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} else if (m_messages.front() + m_burst_duration > m_runtime.now() && !m_messages.full()) {
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delay = Clock::duration::zero();
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} else if (m_messages.front() + m_burst_period < m_runtime.now()) {
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m_messages.clear();
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delay = Clock::duration::zero();
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} else {
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delay = m_messages.front() + m_burst_period - m_runtime.now();
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}
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return delay;
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}
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void BurstBudget::notify()
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{
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m_messages.push_back(m_runtime.now());
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}
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void BurstBudget::burst_messages(std::size_t n)
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{
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// circular_buffer::resize removes last elements if necessary
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m_messages.resize(n);
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}
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void BurstBudget::burst_duration(Clock::duration d)
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{
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assert(d > Clock::duration::zero());
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m_burst_duration = d;
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}
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void BurstBudget::burst_period(Clock::duration p)
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{
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assert(p > Clock::duration::zero());
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m_burst_period = p;
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}
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} // namespace dcc
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} // namespace vanetza
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