device/hid/hid_service.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_HID_HID_SERVICE_H_
   6 #define DEVICE_HID_HID_SERVICE_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/memory/ref_counted.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "device/hid/hid_device_info.h"
  16
  17 namespace device {
  18
  19 class HidConnection;
  20
  21 class HidService {
  22  public:
  23   typedef base::Callback<void(scoped_refptr<HidConnection> connection)>
  24       ConnectCallback;
  25
  26   static HidService* GetInstance(
  27       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
  28       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
  29
  30   // Enumerates and returns a list of device identifiers.
  31   virtual void GetDevices(std::vector<HidDeviceInfo>* devices);
  32
  33   // Fills in a DeviceInfo struct with info for the given device_id.
  34   // Returns |true| if successful or |false| if |device_id| is invalid.
  35   bool GetDeviceInfo(const HidDeviceId& device_id, HidDeviceInfo* info) const;
  36
  37   // Opens a connection to a device. The callback will be run with null on
  38   // failure.
  39   virtual void Connect(const HidDeviceId& device_id,
  40                        const ConnectCallback& callback) = 0;
  41
  42  protected:
  43   friend class HidConnectionTest;
  44
  45   typedef std::map<HidDeviceId, HidDeviceInfo> DeviceMap;
  46
  47   HidService();
  48   virtual ~HidService();
  49
  50   void AddDevice(const HidDeviceInfo& info);
  51   void RemoveDevice(const HidDeviceId& device_id);
  52
  53   const DeviceMap& devices() const { return devices_; }
  54
  55   base::ThreadChecker thread_checker_;
  56
  57  private:
  58   class Destroyer;
  59
  60   DeviceMap devices_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(HidService);
  63 };
  64
  65 }  // namespace device
  66
  67 #endif  // DEVICE_HID_HID_SERVICE_H_