67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
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#include "gradual_state_machine.hpp"
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#include <boost/format.hpp>
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#include <iterator>
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namespace vanetza
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{
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namespace dcc
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{
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GradualStateMachine::GradualStateMachine(const std::set<State>& states) :
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m_states(states), m_current(m_states.begin())
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{
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repair();
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}
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GradualStateMachine::GradualStateMachine(std::set<State>&& states) :
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m_states(std::move(states)), m_current(m_states.begin())
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{
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repair();
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}
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void GradualStateMachine::update(ChannelLoad cbr)
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{
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static_assert(std::is_base_of<std::bidirectional_iterator_tag,
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std::iterator_traits<StateContainer::const_iterator>::iterator_category>::value,
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"State transitions require bidirectional iterators");
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if (cbr < m_current->lower_limit) {
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if (m_current != m_states.begin()) {
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std::advance(m_current, -1);
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}
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} else {
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StateContainer::const_iterator up = std::next(m_current);
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if (up != m_states.end() && cbr >= up->lower_limit) {
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m_current = up;
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}
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}
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}
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Clock::duration GradualStateMachine::transmission_interval() const
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{
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return m_current->off_time;
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}
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std::string GradualStateMachine::state() const
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{
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if (m_current == m_states.begin()) {
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return "Relaxed";
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} else if (m_current == std::prev(m_states.end())) {
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return "Restrictive";
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} else {
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static const boost::format fmt("Active %1%");
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return (boost::format(fmt) % std::distance(m_states.begin(), m_current)).str();
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}
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}
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void GradualStateMachine::repair()
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{
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if (m_states.empty()) {
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m_states.emplace(ChannelLoad(0.0), Clock::duration::zero());
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m_current = m_states.begin();
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}
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}
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} // namespace dcc
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} // namespace vanetza
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