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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/functional/callback.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/power_monitor/power_monitor.h"
#include "base/sequence_checker.h"
#include "base/time/clock.h"
#include "base/time/default_clock.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
namespace base {
WallClockTimer::WallClockTimer() : WallClockTimer(nullptr, nullptr) {}
WallClockTimer::WallClockTimer(const Clock* clock, const TickClock* tick_clock)
: timer_(tick_clock), clock_(clock ? clock : DefaultClock::GetInstance()) {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
WallClockTimer::~WallClockTimer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
PowerMonitor::GetInstance()->RemovePowerSuspendObserver(this);
}
void WallClockTimer::Start(const Location& posted_from,
Time desired_run_time,
OnceClosure user_task) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(user_task);
posted_from_ = posted_from;
desired_run_time_ = desired_run_time;
if (!user_task_) {
PowerMonitor::GetInstance()->AddPowerSuspendObserver(this);
}
user_task_ = std::move(user_task);
OnResume();
}
void WallClockTimer::Stop() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
timer_.Stop();
user_task_.Reset();
PowerMonitor::GetInstance()->RemovePowerSuspendObserver(this);
DETACH_FROM_SEQUENCE(sequence_checker_);
}
bool WallClockTimer::IsRunning() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return timer_.IsRunning();
}
void WallClockTimer::OnResume() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
timer_.Start(posted_from_, desired_run_time_ - clock_->Now(), this,
&WallClockTimer::RunUserTask);
}
void WallClockTimer::RunUserTask() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(user_task_);
PowerMonitor::GetInstance()->RemovePowerSuspendObserver(this);
// Detach the sequence checker before running the task, just in case someone
// sets a new task (= new sequence) while executing the task.
auto task = std::move(user_task_);
DETACH_FROM_SEQUENCE(sequence_checker_);
std::move(task).Run();
}
} // namespace base
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