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// Copyright 2012 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/system/system_monitor.h"
#include <utility>
#include "base/logging.h"
#include "base/time/time.h"
namespace base {
static SystemMonitor* g_system_monitor = nullptr;
SystemMonitor::SystemMonitor()
: devices_changed_observer_list_(
new ObserverListThreadSafe<DevicesChangedObserver>()) {
DCHECK(!g_system_monitor);
g_system_monitor = this;
}
SystemMonitor::~SystemMonitor() {
DCHECK_EQ(this, g_system_monitor);
g_system_monitor = nullptr;
}
// static
SystemMonitor* SystemMonitor::Get() {
return g_system_monitor;
}
void SystemMonitor::ProcessDevicesChanged(DeviceType device_type) {
NotifyDevicesChanged(device_type);
}
void SystemMonitor::AddDevicesChangedObserver(DevicesChangedObserver* obs) {
devices_changed_observer_list_->AddObserver(obs);
}
void SystemMonitor::RemoveDevicesChangedObserver(DevicesChangedObserver* obs) {
devices_changed_observer_list_->RemoveObserver(obs);
}
void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
DVLOG(1) << "DevicesChanged with device type " << device_type;
devices_changed_observer_list_->Notify(
FROM_HERE, &DevicesChangedObserver::OnDevicesChanged, device_type);
}
} // namespace base
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