52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/system/system_monitor.h"
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#include <utility>
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#include "base/logging.h"
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#include "base/time/time.h"
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namespace base {
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static SystemMonitor* g_system_monitor = nullptr;
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SystemMonitor::SystemMonitor()
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: devices_changed_observer_list_(
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new ObserverListThreadSafe<DevicesChangedObserver>()) {
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DCHECK(!g_system_monitor);
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g_system_monitor = this;
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}
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SystemMonitor::~SystemMonitor() {
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DCHECK_EQ(this, g_system_monitor);
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g_system_monitor = nullptr;
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}
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// static
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SystemMonitor* SystemMonitor::Get() {
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return g_system_monitor;
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}
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void SystemMonitor::ProcessDevicesChanged(DeviceType device_type) {
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NotifyDevicesChanged(device_type);
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}
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void SystemMonitor::AddDevicesChangedObserver(DevicesChangedObserver* obs) {
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devices_changed_observer_list_->AddObserver(obs);
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}
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void SystemMonitor::RemoveDevicesChangedObserver(DevicesChangedObserver* obs) {
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devices_changed_observer_list_->RemoveObserver(obs);
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}
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void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
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DVLOG(1) << "DevicesChanged with device type " << device_type;
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devices_changed_observer_list_->Notify(
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FROM_HERE, &DevicesChangedObserver::OnDevicesChanged, device_type);
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}
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} // namespace base
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