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// Copyright 2022 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/power_monitor/battery_state_sampler.h"
#include "base/power_monitor/power_monitor_buildflags.h"
#if !BUILDFLAG(IS_MAC)
#include "base/power_monitor/timer_sampling_event_source.h"
#endif
namespace base {
namespace {
// Singleton instance of the BatteryStateSampler.
BatteryStateSampler* g_battery_state_sampler = nullptr;
bool g_test_instance_installed = false;
} // namespace
BatteryStateSampler::BatteryStateSampler(
std::unique_ptr<SamplingEventSource> sampling_event_source,
std::unique_ptr<BatteryLevelProvider> battery_level_provider)
: sampling_event_source_(std::move(sampling_event_source)),
battery_level_provider_(std::move(battery_level_provider)) {
DCHECK(sampling_event_source_);
DCHECK(battery_level_provider_);
DCHECK(!g_battery_state_sampler);
g_battery_state_sampler = this;
// Get an initial sample.
battery_level_provider_->GetBatteryState(
base::BindOnce(&BatteryStateSampler::OnInitialBatteryStateSampled,
base::Unretained(this)));
// Start the periodic sampling.
sampling_event_source_->Start(base::BindRepeating(
&BatteryStateSampler::OnSamplingEvent, base::Unretained(this)));
}
BatteryStateSampler::~BatteryStateSampler() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_EQ(g_battery_state_sampler, this);
g_battery_state_sampler = nullptr;
g_test_instance_installed = false;
}
// static
BatteryStateSampler* BatteryStateSampler::Get() {
// On a platform with a BatteryLevelProvider implementation, the global
// instance must be created before accessing it.
// TODO(crbug.com/40871810): ChromeOS currently doesn't define
// `HAS_BATTERY_LEVEL_PROVIDER_IMPL` but it should once the locations of the
// providers and sampling sources are consolidated.
#if BUILDFLAG(HAS_BATTERY_LEVEL_PROVIDER_IMPL) || BUILDFLAG(IS_CHROMEOS)
DCHECK(g_battery_state_sampler);
#endif
return g_battery_state_sampler;
}
void BatteryStateSampler::AddObserver(Observer* observer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
observer_list_.AddObserver(observer);
// Send the last sample available.
if (has_last_battery_state_) {
observer->OnBatteryStateSampled(last_battery_state_);
}
}
void BatteryStateSampler::RemoveObserver(Observer* observer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
observer_list_.RemoveObserver(observer);
}
void BatteryStateSampler::Shutdown() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
sampling_event_source_.reset();
battery_level_provider_.reset();
}
// static
std::unique_ptr<base::BatteryStateSampler>
BatteryStateSampler::CreateInstanceForTesting(
std::unique_ptr<SamplingEventSource> sampling_event_source,
std::unique_ptr<BatteryLevelProvider> battery_level_provider) {
g_test_instance_installed = true;
return std::make_unique<BatteryStateSampler>(
std::move(sampling_event_source), std::move(battery_level_provider));
}
// static
bool BatteryStateSampler::HasTestingInstance() {
return g_test_instance_installed;
}
base::TimeDelta BatteryStateSampler::GetSampleInterval() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return sampling_event_source_->GetSampleInterval();
}
#if !BUILDFLAG(IS_MAC)
// static
std::unique_ptr<SamplingEventSource>
BatteryStateSampler::CreateSamplingEventSource() {
// On platforms where the OS does not provide a notification when an updated
// battery level is available, simply sample on a regular 1 minute interval.
return std::make_unique<TimerSamplingEventSource>(Minutes(1));
}
#endif // !BUILDFLAG(IS_MAC)
void BatteryStateSampler::OnInitialBatteryStateSampled(
const std::optional<BatteryLevelProvider::BatteryState>& battery_state) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!has_last_battery_state_);
has_last_battery_state_ = true;
last_battery_state_ = battery_state;
for (auto& observer : observer_list_) {
observer.OnBatteryStateSampled(battery_state);
}
}
void BatteryStateSampler::OnSamplingEvent() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(battery_level_provider_);
battery_level_provider_->GetBatteryState(base::BindOnce(
&BatteryStateSampler::OnBatteryStateSampled, base::Unretained(this)));
}
void BatteryStateSampler::OnBatteryStateSampled(
const std::optional<BatteryLevelProvider::BatteryState>& battery_state) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(has_last_battery_state_);
last_battery_state_ = battery_state;
for (auto& observer : observer_list_) {
observer.OnBatteryStateSampled(battery_state);
}
}
} // namespace base
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