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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/usb/usb_service.h"
#include "base/message_loop/message_loop.h"
#include "device/usb/usb_device.h"
#include "device/usb/usb_service_impl.h"
namespace device {
namespace {
UsbService* g_service;
} // namespace
// This class manages the lifetime of the global UsbService instance so that
// it is destroyed when the current message loop is destroyed. A lazy instance
// cannot be used because this object does not live on the main thread.
class UsbService::Destroyer : private base::MessageLoop::DestructionObserver {
public:
explicit Destroyer(UsbService* usb_service) : usb_service_(usb_service) {
base::MessageLoop::current()->AddDestructionObserver(this);
}
~Destroyer() override {}
private:
// base::MessageLoop::DestructionObserver implementation.
void WillDestroyCurrentMessageLoop() override {
base::MessageLoop::current()->RemoveDestructionObserver(this);
delete usb_service_;
delete this;
g_service = nullptr;
}
UsbService* usb_service_;
};
void UsbService::Observer::OnDeviceAdded(scoped_refptr<UsbDevice> device) {
}
void UsbService::Observer::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {
}
// static
UsbService* UsbService::GetInstance(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
if (!g_service) {
g_service = UsbServiceImpl::Create(ui_task_runner);
// This object will clean itself up when the message loop is destroyed.
new Destroyer(g_service);
}
return g_service;
}
// static
void UsbService::SetInstanceForTest(UsbService* instance) {
g_service = instance;
new Destroyer(instance);
}
UsbService::UsbService() {
}
UsbService::~UsbService() {
}
void UsbService::AddObserver(Observer* observer) {
DCHECK(CalledOnValidThread());
observer_list_.AddObserver(observer);
}
void UsbService::RemoveObserver(Observer* observer) {
DCHECK(CalledOnValidThread());
observer_list_.RemoveObserver(observer);
}
void UsbService::NotifyDeviceAdded(scoped_refptr<UsbDevice> device) {
DCHECK(CalledOnValidThread());
FOR_EACH_OBSERVER(Observer, observer_list_, OnDeviceAdded(device));
}
void UsbService::NotifyDeviceRemoved(scoped_refptr<UsbDevice> device) {
DCHECK(CalledOnValidThread());
FOR_EACH_OBSERVER(Observer, observer_list_, OnDeviceRemoved(device));
}
} // namespace device
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