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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef DEVICE_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_H_
#define DEVICE_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_H_
#include <string>
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/types/id_type.h"
#include "device/bluetooth/bluetooth_export.h"
namespace device {
class BluetoothRemoteGattCharacteristic;
// A BluetoothGattNotifySession represents an active session for listening
// to value updates from GATT characteristics that support notifications and/or
// indications. Instances are obtained by calling
// BluetoothRemoteGattCharacteristic::StartNotifySession.
class DEVICE_BLUETOOTH_EXPORT BluetoothGattNotifySession {
public:
using Id = base::IdTypeU64<BluetoothGattNotifySession>;
explicit BluetoothGattNotifySession(
base::WeakPtr<BluetoothRemoteGattCharacteristic> characteristic);
BluetoothGattNotifySession(const BluetoothGattNotifySession&) = delete;
BluetoothGattNotifySession& operator=(const BluetoothGattNotifySession&) =
delete;
Id unique_id() { return unique_id_; }
// Destructor automatically stops this session.
virtual ~BluetoothGattNotifySession();
// Returns the identifier of the associated characteristic.
virtual std::string GetCharacteristicIdentifier() const;
// Returns the associated characteristic. This function will return nullptr
// if the associated characteristic is deleted.
virtual BluetoothRemoteGattCharacteristic* GetCharacteristic() const;
// Returns true if this session is active. Notify sessions are active from
// the time of creation, until they have been stopped, either explicitly, or
// because the remote device disconnects.
virtual bool IsActive();
// Stops this session and calls |callback| upon completion. This won't
// necessarily stop value updates from the characteristic -- since updates
// are shared among BluetoothGattNotifySession instances -- but it will
// terminate this session.
virtual void Stop(base::OnceClosure callback);
private:
static Id GetNextId();
// The associated characteristic.
base::WeakPtr<BluetoothRemoteGattCharacteristic> characteristic_;
std::string characteristic_id_;
bool active_;
const Id unique_id_;
};
} // namespace device
#endif // DEVICE_BLUETOOTH_BLUETOOTH_GATT_NOTIFY_SESSION_H_
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