HID backend

device/hid/hid_service.h

+// Copyright (c) 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.
+
+#ifndef DEVICE_HID_HID_SERVICE_H_
+#define DEVICE_HID_HID_SERVICE_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string16.h"
+#include "base/threading/thread_checker.h"
+#include "build/build_config.h"
+#include "device/hid/hid_device_info.h"
+
+namespace device {
+
+namespace {
+
+class HidServiceContainer;
+
+}  // namespace
+
+class HidConnection;
+class HidService;
+
+class HidService : public base::MessageLoop::DestructionObserver {
+ public:
+  // Must be called on FILE thread.
+  static HidService* GetInstance();
+
+  // Enumerates and returns a list of device identifiers.
+  virtual void GetDevices(std::vector<HidDeviceInfo>* devices);
+
+  // Fills in the device info struct of the given device_id.
+  // Returns true if succeed.
+  // Returns false if the device_id is invalid, with info untouched.
+  bool GetInfo(std::string device_id, HidDeviceInfo* info) const;
+
+  virtual scoped_refptr<HidConnection> Connect(
+      std::string platform_device_id) = 0;
+
+  // Implements base::MessageLoop::DestructionObserver
+  virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
+
+  // Gets whether the HidService have been successfully initialized.
+  bool initialized() const { return initialized_; }
+
+ protected:
+  friend class HidServiceContainer;
+  friend struct base::DefaultDeleter<HidService>;
+  friend class HidConnectionTest;
+
+  HidService();
+  virtual ~HidService();
+
+  static HidService* CreateInstance();
+
+  virtual void AddDevice(HidDeviceInfo info);
+  virtual void RemoveDevice(std::string platform_device_id);
+
+  typedef std::map<std::string, HidDeviceInfo> DeviceMap;
+  DeviceMap devices_;
+
+  bool initialized_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(HidService);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_HID_HID_SERVICE_H_