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// Copyright 2016 The Android Open Source Project
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <atomic>
#include <functional>
#include <map>
#include <mutex>
#include <base/macros.h>
#include <bluetooth/uuid.h>
#include "service/bluetooth_instance.h"
#include "service/common/bluetooth/advertise_data.h"
#include "service/common/bluetooth/advertise_settings.h"
#include "service/common/bluetooth/low_energy_constants.h"
#include "service/common/bluetooth/scan_filter.h"
#include "service/common/bluetooth/scan_result.h"
#include "service/common/bluetooth/scan_settings.h"
#include "service/hal/bluetooth_gatt_interface.h"
namespace bluetooth {
class Adapter;
// A LowEnergyScanner represents an application's handle to perform various
// Bluetooth Low Energy GAP operations. Instances cannot be created directly and
// should be obtained through the factory.
class LowEnergyScanner : private hal::BluetoothGattInterface::ScannerObserver,
public BluetoothInstance {
// The Delegate interface is used to notify asynchronous events related to LE
// scan.
class Delegate {
Delegate() = default;
virtual ~Delegate() = default;
// Called asynchronously to notify the delegate of nearby BLE advertisers
// found during a device scan.
virtual void OnScanResult(LowEnergyScanner* client,
const ScanResult& scan_result) = 0;
// The destructor automatically unregisters this client instance from the
// stack.
~LowEnergyScanner() override;
// Assigns a delegate to this instance. |delegate| must out-live this
// LowEnergyClient instance.
void SetDelegate(Delegate* delegate);
// Initiates a BLE device scan for this client using the given |settings| and
// |filters|. See the documentation for ScanSettings and ScanFilter for how
// these parameters can be configured. Return true on success, false
// otherwise. Please see logs for details in case of error.
bool StartScan(const ScanSettings& settings,
const std::vector<ScanFilter>& filters);
// Stops an ongoing BLE device scan for this client.
bool StopScan();
// Returns the current scan settings.
const ScanSettings& scan_settings() const { return scan_settings_; }
// BluetoothInstace overrides:
const Uuid& GetAppIdentifier() const override;
int GetInstanceId() const override;
void ScanResultCallback(hal::BluetoothGattInterface* gatt_iface,
const RawAddress& bda, int rssi,
std::vector<uint8_t> adv_data) override;
friend class LowEnergyScannerFactory;
// Constructor shouldn't be called directly as instances are meant to be
// obtained from the factory.
LowEnergyScanner(Adapter& adapter, const Uuid& uuid, int scanner_id);
// Calls and clears the pending callbacks.
void InvokeAndClearStartCallback(BLEStatus status);
void InvokeAndClearStopCallback(BLEStatus status);
// Raw pointer to the Bluetooth Adapter.
Adapter& adapter_;
// See getters above for documentation.
Uuid app_identifier_;
int scanner_id_;
// Protects device scan related members below.
std::mutex scan_fields_lock_;
// Current scan settings.
ScanSettings scan_settings_;
// If true, then this client have a BLE device scan in progress.
std::atomic_bool scan_started_;
// Raw handle to the Delegate, which must outlive this LowEnergyScanner
// instance.
std::mutex delegate_mutex_;
Delegate* delegate_;
// LowEnergyScannerFactory is used to register and obtain a per-application
// LowEnergyScanner instance. Users should call RegisterInstance to obtain their
// own unique LowEnergyScanner instance that has been registered with the
// Bluetooth stack.
class LowEnergyScannerFactory
: private hal::BluetoothGattInterface::ScannerObserver,
public BluetoothInstanceFactory {
// Don't construct/destruct directly except in tests. Instead, obtain a handle
// from an Adapter instance.
explicit LowEnergyScannerFactory(Adapter& adapter);
~LowEnergyScannerFactory() override;
// BluetoothInstanceFactory override:
bool RegisterInstance(const Uuid& app_uuid,
const RegisterCallback& callback) override;
friend class LowEnergyScanner;
// BluetoothGattInterface::ScannerObserver overrides:
void RegisterScannerCallback(const RegisterCallback& callback,
const Uuid& app_uuid, uint8_t scanner_id,
uint8_t status);
// Map of pending calls to register.
std::mutex pending_calls_lock_;
std::unordered_set<Uuid> pending_calls_;
// Raw pointer to the Adapter that owns this factory.
Adapter& adapter_;
} // namespace bluetooth