1 // 2 // Copyright 2015 Google, Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at: 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #pragma once 18 19 #include <functional> 20 #include <memory> 21 22 #include <base/macros.h> 23 #include <bluetooth/uuid.h> 24 25 #include "service/common/bluetooth/low_energy_constants.h" 26 27 namespace bluetooth { 28 29 // A BluetoothInstance represents an application's handle to an instance 30 // that is registered with the underlying Bluetooth stack using a Uuid and has a 31 // stack-assigned integer "instance_id" ID associated with it. 32 class BluetoothInstance { 33 public: 34 virtual ~BluetoothInstance() = default; 35 36 // Returns the app-specific unique ID used while registering this instance. 37 virtual const Uuid& GetAppIdentifier() const = 0; 38 39 // Returns the HAL "interface ID" assigned to this instance by the stack. 40 virtual int GetInstanceId() const = 0; 41 42 protected: 43 // Constructor shouldn't be called directly as instances are meant to be 44 // obtained from the factory. 45 BluetoothInstance() = default; 46 47 private: 48 DISALLOW_COPY_AND_ASSIGN(BluetoothInstance); 49 }; 50 51 // A BluetoothInstanceFactory provides a common interface for factory 52 // classes that handle asynchronously registering a per-application instance of 53 // a BluetoothInstance with the underlying stack. 54 class BluetoothInstanceFactory { 55 public: 56 BluetoothInstanceFactory() = default; 57 virtual ~BluetoothInstanceFactory() = default; 58 59 // Callback invoked as a result of a call to RegisterInstance. 60 using RegisterCallback = 61 std::function<void(BLEStatus status, const Uuid& app_uuid, 62 std::unique_ptr<BluetoothInstance> instance)>; 63 64 // Registers an instance for the given unique identifier |app_uuid|. 65 // On success, this asynchronously invokes |callback| with a unique pointer 66 // to a BluetoothInstance whose ownership can be taken by the caller. In 67 // the case of an error, the pointer will contain nullptr. 68 virtual bool RegisterInstance(const Uuid& app_uuid, 69 const RegisterCallback& callback) = 0; 70 71 private: 72 DISALLOW_COPY_AND_ASSIGN(BluetoothInstanceFactory); 73 }; 74 75 } // namespace bluetooth 76