102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
#ifndef ADAPTERS_BOOST_ASIO_DEADLINE_TIMER_AREQ_H
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#define ADAPTERS_BOOST_ASIO_DEADLINE_TIMER_AREQ_H
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#include <atomic>
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#include <coroutine>
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#include <memory>
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#include <boost/asio/deadline_timer.hpp>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/post.hpp>
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#include <boost/date_time/posix_time/posix_time_types.hpp>
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#include <boost/system/error_code.hpp>
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namespace adapters::boostAsio {
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/** Coroutine awaiter: true if the delay elapsed, false if cancelled/aborted.
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*
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* Reuses the caller-supplied deadline_timer; does not allocate a new timer.
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*/
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class DeadlineTimerAReq
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{
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public:
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struct AsyncState
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{
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std::atomic<bool> settled{false};
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bool timerExpiredNormally = false;
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std::coroutine_handle<> callerSchedHandle;
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};
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DeadlineTimerAReq(
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boost::asio::io_context &resumeIoContext,
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boost::asio::deadline_timer &timer,
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const boost::posix_time::milliseconds delay)
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: asyncState(std::make_shared<AsyncState>()),
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resumeIoContext(resumeIoContext)
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{
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timer.expires_from_now(delay);
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timer.async_wait(
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[this](const boost::system::error_code &error)
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{
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onTimer(error);
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});
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}
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bool await_ready() const noexcept
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{
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return asyncState->settled.load(std::memory_order_acquire);
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}
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bool await_suspend(std::coroutine_handle<> caller) noexcept
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{
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if (asyncState->settled.load(std::memory_order_acquire)) {
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return false;
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}
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asyncState->callerSchedHandle = caller;
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return true;
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}
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bool await_resume() const noexcept
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{
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return asyncState->timerExpiredNormally;
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}
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private:
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void onTimer(const boost::system::error_code &error)
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{
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if (asyncState->settled.exchange(true)) {
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return;
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}
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asyncState->timerExpiredNormally = !error;
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signalSettledAndResumeCaller();
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}
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void signalSettledAndResumeCaller()
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{
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std::coroutine_handle<> handle = asyncState->callerSchedHandle;
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if (!handle) {
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return;
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}
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boost::asio::post(resumeIoContext, handle);
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}
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std::shared_ptr<AsyncState> asyncState;
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boost::asio::io_context &resumeIoContext;
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};
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inline auto getDeadlineTimerAReqAwaiter(
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boost::asio::io_context &resumeIoContext,
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boost::asio::deadline_timer &timer,
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const boost::posix_time::milliseconds delay)
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{
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return DeadlineTimerAReq(resumeIoContext, timer, delay);
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}
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} // namespace adapters::boostAsio
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#endif // ADAPTERS_BOOST_ASIO_DEADLINE_TIMER_AREQ_H
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