130 lines
2.9 KiB
C++
130 lines
2.9 KiB
C++
// This file Copyright 2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <chrono>
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#include <memory>
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#include <utility>
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#include <event2/event.h>
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#include "tr-assert.h"
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#include "timer-ev.h"
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using namespace std::literals;
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namespace libtransmission
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{
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class EvTimer final : public Timer
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{
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public:
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explicit EvTimer(struct event_base* base)
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: base_{ base }
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{
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setRepeating(is_repeating_);
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}
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EvTimer(EvTimer&&) = delete;
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EvTimer(EvTimer const&) = delete;
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EvTimer& operator=(EvTimer&&) = delete;
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EvTimer& operator=(EvTimer const&) = delete;
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~EvTimer() override
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{
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stop();
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event_free(evtimer_);
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}
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void stop() override
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{
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evtimer_del(evtimer_);
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}
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void start() override
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{
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restart();
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}
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void setCallback(std::function<void()> callback) override
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{
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callback_ = std::move(callback);
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}
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[[nodiscard]] std::chrono::milliseconds interval() const noexcept override
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{
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return interval_;
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}
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void setInterval(std::chrono::milliseconds interval) override
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{
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TR_ASSERT_MSG(interval.count() > 0 || !is_repeating_, "repeating timers must have a positive interval");
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interval_ = interval;
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// if evtimer_ is already running, update its interval
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if (auto const is_pending = event_pending(evtimer_, EV_TIMEOUT, nullptr); is_pending != 0)
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{
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restart();
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}
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}
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[[nodiscard]] bool isRepeating() const noexcept override
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{
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return is_repeating_;
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}
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void setRepeating(bool repeating) override
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{
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is_repeating_ = repeating;
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if (evtimer_ != nullptr)
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{
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event_del(evtimer_);
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event_free(evtimer_);
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}
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evtimer_ = repeating ? event_new(base_, -1, EV_TIMEOUT | EV_PERSIST, onTimer, this) :
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event_new(base_, -1, EV_TIMEOUT, onTimer, this);
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}
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private:
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void restart()
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{
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stop();
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using namespace std::chrono;
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auto const secs = duration_cast<seconds>(interval_);
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auto tv = timeval{};
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tv.tv_sec = secs.count();
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tv.tv_usec = duration_cast<microseconds>(interval_ - secs).count();
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evtimer_add(evtimer_, &tv);
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}
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static void onTimer(evutil_socket_t /*unused*/, short /*unused*/, void* vself)
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{
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static_cast<EvTimer*>(vself)->handleTimer();
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}
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void handleTimer() const
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{
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TR_ASSERT(callback_);
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callback_();
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}
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struct event_base* const base_;
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struct event* evtimer_ = nullptr;
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std::function<void()> callback_;
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std::chrono::milliseconds interval_ = 100ms;
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bool is_repeating_ = true;
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};
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std::unique_ptr<Timer> EvTimerMaker::create()
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{
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return std::make_unique<EvTimer>(event_base_);
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}
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} // namespace libtransmission
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