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/memory/scoped_ptr.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "base/threading/thread_checker.h"
  16 #include "device/hid/hid_device_info.h"
  17
  18 namespace device {
  19
  20 class HidConnection;
  21
  22 class HidService : public base::MessageLoop::DestructionObserver {
  23  public:
  24   // Must be called on FILE thread.
  25   static HidService* GetInstance();
  26
  27   // Enumerates and returns a list of device identifiers.
  28   virtual void GetDevices(std::vector<HidDeviceInfo>* devices);
  29
  30   // Fills in a DeviceInfo struct with info for the given device_id.
  31   // Returns |true| if successful or |false| if |device_id| is invalid.
  32   bool GetDeviceInfo(const HidDeviceId& device_id, HidDeviceInfo* info) const;
  33
  34   virtual scoped_refptr<HidConnection> Connect(
  35       const HidDeviceId& device_id) = 0;
  36
  37   // Implements base::MessageLoop::DestructionObserver
  38   virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
  39
  40  protected:
  41   friend struct base::DefaultDeleter<HidService>;
  42   friend class HidConnectionTest;
  43
  44   typedef std::map<HidDeviceId, HidDeviceInfo> DeviceMap;
  45
  46   HidService();
  47   virtual ~HidService();
  48
  49   static HidService* CreateInstance();
  50
  51   void AddDevice(const HidDeviceInfo& info);
  52   void RemoveDevice(const HidDeviceId& device_id);
  53
  54   base::ThreadChecker thread_checker_;
  55
  56  private:
  57   DeviceMap devices_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(HidService);
  60 };
  61
  62 }  // namespace device
  63
  64 #endif  // DEVICE_HID_HID_SERVICE_H_