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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_TETHER_TETHER_HOST_RESPONSE_RECORDER_H_
#define CHROMEOS_ASH_COMPONENTS_TETHER_TETHER_HOST_RESPONSE_RECORDER_H_
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
class PrefService;
namespace user_prefs {
class PrefRegistrySyncable;
} // namespace user_prefs
namespace ash::tether {
// Records responses from tether hosts in user prefs, which persists these
// responses between reboots of the device. When a TetherAvailabilityResponse or
// ConnectTetheringResponse is received, it should be recorded using this class.
// Responses can be retrieved at a later time via getter methods.
class TetherHostResponseRecorder {
public:
class Observer {
public:
virtual void OnPreviouslyConnectedHostIdsChanged() = 0;
};
// Registers the prefs used by this class to |registry|. Must be called before
// this class is utilized.
static void RegisterPrefs(user_prefs::PrefRegistrySyncable* registry);
// Note: The PrefService* passed here must be created using the same registry
// passed to RegisterPrefs().
explicit TetherHostResponseRecorder(PrefService* pref_service);
TetherHostResponseRecorder(const TetherHostResponseRecorder&) = delete;
TetherHostResponseRecorder& operator=(const TetherHostResponseRecorder&) =
delete;
virtual ~TetherHostResponseRecorder();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Records a TetherAvailabilityResponse. This function should be called each
// time that a response is received from a potential host, even if a
// connection is not started.
virtual void RecordSuccessfulTetherAvailabilityResponse(
const std::string& device_id);
// Gets device IDs corresponding to hosts which have sent
// TetherAvailabilityResponses with a response code indicating that tethering
// is available. The list is sorted; the IDs of the devices which have
// responded most recently are at the front of the list and the IDs of the
// devices which have responded least recently are at the end of the list.
virtual std::vector<std::string> GetPreviouslyAvailableHostIds() const;
// Records a ConnectTetheringResponse. This function should be called each
// time that a response is received from a host.
virtual void RecordSuccessfulConnectTetheringResponse(
const std::string& device_id);
// Gets device IDs corresponding to hosts which have sent
// ConnectTetheringResponses with a response code indicating that they have
// successfully turned on their Wi-Fi hotspots. The list is sorted; the IDs of
// the devices which have responded most recently are at the front of the list
// and the IDs of the devices which have responded least recently are at the
// end of the list.
virtual std::vector<std::string> GetPreviouslyConnectedHostIds() const;
private:
friend class NetworkHostScanCacheTest;
void NotifyObserversPreviouslyConnectedHostIdsChanged();
// Returns whether the list was changed due to adding the response.
bool AddRecentResponse(const std::string& device_id,
const std::string& pref_name);
std::vector<std::string> GetDeviceIdsForPref(
const std::string& pref_name) const;
raw_ptr<PrefService> pref_service_;
base::ObserverList<Observer>::Unchecked observer_list_;
};
} // namespace ash::tether
#endif // CHROMEOS_ASH_COMPONENTS_TETHER_TETHER_HOST_RESPONSE_RECORDER_H_
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