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// Copyright 2014 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 <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
namespace base {
class SingleThreadTaskRunner;
namespace device {
class UsbDevice;
// The USB service handles creating and managing an event handler thread that is
// used to manage and dispatch USB events. It is also responsible for device
// discovery on the system, which allows it to re-use device handles to prevent
// competition for the same USB device.
class UsbService : public base::NonThreadSafe {
// Must be called on a thread with a MessageLoopForIO (for example
// BrowserThread::FILE). The UI task runner reference is used to talk to the
// PermissionBrokerClient on ChromeOS (UI thread). Returns NULL when
// initialization fails.
static UsbService* GetInstance(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
static void SetInstanceForTest(UsbService* instance);
virtual scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id) = 0;
// Get all of the devices attached to the system, inserting them into
// |devices|. Clears |devices| before use. The result will be sorted by id
// in increasing order. Must be called on FILE thread.
virtual void GetDevices(std::vector<scoped_refptr<UsbDevice> >* devices) = 0;
friend struct base::DefaultDeleter<UsbService>;
UsbService() {}
virtual ~UsbService() {}
} // namespace device