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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/timer/wall_clock_timer.h"
#include <utility>
#include "base/power_monitor/power_monitor.h"
#include "base/time/clock.h"
#include "base/time/default_clock.h"
#include "base/time/default_tick_clock.h"
#include "base/time/tick_clock.h"
namespace base {
WallClockTimer::WallClockTimer() = default;
WallClockTimer::WallClockTimer(const Clock* clock, const TickClock* tick_clock)
: timer_(tick_clock), clock_(clock ? clock : DefaultClock::GetInstance()) {}
WallClockTimer::~WallClockTimer() {
RemoveObserver();
}
void WallClockTimer::Start(const Location& posted_from,
Time desired_run_time,
OnceClosure user_task) {
user_task_ = std::move(user_task);
posted_from_ = posted_from;
desired_run_time_ = desired_run_time;
AddObserver();
timer_.Start(posted_from_, desired_run_time_ - Now(), this,
&WallClockTimer::RunUserTask);
}
void WallClockTimer::Stop() {
timer_.Stop();
user_task_.Reset();
RemoveObserver();
}
bool WallClockTimer::IsRunning() const {
return timer_.IsRunning();
}
void WallClockTimer::OnResume() {
// This will actually restart timer with smaller delay
timer_.Start(posted_from_, desired_run_time_ - Now(), this,
&WallClockTimer::RunUserTask);
}
void WallClockTimer::AddObserver() {
if (!observer_added_) {
PowerMonitor::AddPowerSuspendObserver(this);
observer_added_ = true;
}
}
void WallClockTimer::RemoveObserver() {
if (observer_added_) {
PowerMonitor::RemovePowerSuspendObserver(this);
observer_added_ = false;
}
}
void WallClockTimer::RunUserTask() {
DCHECK(user_task_);
RemoveObserver();
std::exchange(user_task_, {}).Run();
}
Time WallClockTimer::Now() const {
return clock_->Now();
}
} // namespace base
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