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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
#pragma once
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#include <boost/asio.hpp>
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#include <deque>
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#include <functional>
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#include <chrono>
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#include <thread>
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#include "logging.h"
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namespace crow
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{
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namespace detail
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{
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// fast timer queue for fixed tick value.
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class dumb_timer_queue
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{
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public:
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using key = std::pair<dumb_timer_queue*, int>;
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void cancel(key& k)
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{
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auto self = k.first;
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k.first = nullptr;
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if (!self)
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return;
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unsigned int index = (unsigned int)(k.second - self->step_);
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if (index < self->dq_.size())
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self->dq_[index].second = nullptr;
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}
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key add(std::function<void()> f)
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{
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dq_.emplace_back(std::chrono::steady_clock::now(), std::move(f));
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int ret = step_+dq_.size()-1;
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CROW_LOG_DEBUG << "timer add inside: " << this << ' ' << ret ;
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return {this, ret};
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}
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void process()
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{
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if (!io_service_)
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return;
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auto now = std::chrono::steady_clock::now();
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while(!dq_.empty())
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{
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auto& x = dq_.front();
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if (now - x.first < std::chrono::seconds(tick))
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break;
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if (x.second)
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{
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CROW_LOG_DEBUG << "timer call: " << this << ' ' << step_;
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// we know that timer handlers are very simple currenty; call here
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x.second();
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}
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dq_.pop_front();
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step_++;
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}
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}
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void set_io_service(boost::asio::io_service& io_service)
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{
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io_service_ = &io_service;
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}
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dumb_timer_queue() noexcept
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{
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}
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private:
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int tick{5};
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boost::asio::io_service* io_service_{};
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std::deque<std::pair<decltype(std::chrono::steady_clock::now()), std::function<void()>>> dq_;
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int step_{};
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};
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}
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}
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