93 lines
2.0 KiB
C++
93 lines
2.0 KiB
C++
#pragma once
|
|
|
|
#include <deque>
|
|
#include <chrono>
|
|
|
|
#include "common.hpp"
|
|
#include "components/logger.hpp"
|
|
|
|
POLYBAR_NS
|
|
|
|
namespace chrono = std::chrono;
|
|
|
|
namespace throttle_util {
|
|
using timewindow = chrono::duration<double, std::milli>;
|
|
using timepoint_clock = chrono::high_resolution_clock;
|
|
using timepoint = timepoint_clock::time_point;
|
|
using queue = std::deque<timepoint>;
|
|
using limit = size_t;
|
|
|
|
namespace strategy {
|
|
struct try_once_or_leave_yolo {
|
|
bool operator()(queue& q, limit l, timewindow);
|
|
};
|
|
struct wait_patiently_by_the_door {
|
|
bool operator()(queue& q, limit l, timewindow);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Throttle events within a set window of time
|
|
*
|
|
* Example usage:
|
|
* @code cpp
|
|
* auto t = throttle_util::make_throttler(2, 1s);
|
|
* if (t->passthrough())
|
|
* ...
|
|
* @endcode
|
|
*/
|
|
class event_throttler {
|
|
public:
|
|
/**
|
|
* Construct throttler
|
|
*/
|
|
explicit event_throttler(int limit, timewindow timewindow)
|
|
: m_limit(limit), m_timewindow(timewindow) {}
|
|
|
|
/**
|
|
* Check if event is allowed to pass
|
|
* using specified strategy
|
|
*/
|
|
template <typename Strategy>
|
|
bool passthrough(Strategy wait_strategy) {
|
|
expire_timestamps();
|
|
return wait_strategy(m_queue, m_limit, m_timewindow);
|
|
}
|
|
|
|
/**
|
|
* Check if event is allowed to pass
|
|
* using default strategy
|
|
*/
|
|
bool passthrough() {
|
|
return passthrough(strategy::try_once_or_leave_yolo{});
|
|
}
|
|
|
|
protected:
|
|
/**
|
|
* Expire old timestamps
|
|
*/
|
|
void expire_timestamps() {
|
|
auto now = timepoint_clock::now();
|
|
while (m_queue.size() > 0) {
|
|
if ((now - m_queue.front()) < m_timewindow)
|
|
break;
|
|
m_queue.pop_front();
|
|
}
|
|
}
|
|
|
|
private:
|
|
queue m_queue;
|
|
limit m_limit;
|
|
timewindow m_timewindow;
|
|
};
|
|
|
|
using throttle_t = unique_ptr<event_throttler>;
|
|
|
|
template <typename... Args>
|
|
throttle_t make_throttler(Args&&... args) {
|
|
return make_unique<event_throttler>(forward<Args>(args)...);
|
|
}
|
|
}
|
|
|
|
POLYBAR_NS_END
|