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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/autofill/next_idle_barrier.h"
#include <memory>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/task/current_thread.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/autofill/core/common/autofill_features.h"
#include "content/public/browser/browser_thread.h"
namespace autofill {
struct NextIdleBarrier::Data {
// Sets `value` to `true` and emits a metric how much time has passed since
// `start_time`.
void OnUiThreadIdle(base::TimeTicks start_time);
// Starts a timer for a measurement attempt of the next idle time ticks.
void StartTimerForMeasurementAttempt(base::TimeDelta delay);
// Registers a callback with the UI thread in the browser process to measure
// the time ticks the next time the UI thread becomes idle. Offset is passed
// on to `SetValueToCurrentTimeTicksWithOffset`.
void AttemptMeasurement();
// Whether the UI thread has been idle.
bool value = false;
// The callback subscription for when the UI thread becomes idle the next
// time.
base::CallbackListSubscription on_idle_callback_subscription;
// A timer that controls the next next measurement attempt.
base::OneShotTimer measurement_delay_timer;
};
void NextIdleBarrier::Data::OnUiThreadIdle(base::TimeTicks start_time) {
CHECK(!value);
value = true;
}
void NextIdleBarrier::Data::StartTimerForMeasurementAttempt(
base::TimeDelta delay) {
measurement_delay_timer.Start(FROM_HERE, delay, this,
&NextIdleBarrier::Data::AttemptMeasurement);
}
void NextIdleBarrier::Data::AttemptMeasurement() {
on_idle_callback_subscription =
base::CurrentUIThread::Get()->RegisterOnNextIdleCallback(
{}, base::BindOnce(&NextIdleBarrier::Data::OnUiThreadIdle,
base::Unretained(this), base::TimeTicks::Now()));
}
NextIdleBarrier::NextIdleBarrier() = default;
NextIdleBarrier::NextIdleBarrier(NextIdleBarrier&&) = default;
NextIdleBarrier& NextIdleBarrier::operator=(NextIdleBarrier&&) = default;
NextIdleBarrier::~NextIdleBarrier() = default;
// static
NextIdleBarrier NextIdleBarrier::CreateNextIdleBarrierWithDelay(
base::TimeDelta delay) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
NextIdleBarrier result;
result.data_ = std::make_unique<Data>();
result.data_->StartTimerForMeasurementAttempt(delay);
return result;
}
bool NextIdleBarrier::value() const {
return data_ && data_->value;
}
} // namespace autofill
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