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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_DEVICE_PRIORITIZER_H_ |
| 6 #define CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_DEVICE_PRIORITIZER_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 #include "components/cryptauth/remote_device.h" |
| 10 |
| 11 class PrefService; |
| 12 class PrefRegistrySimple; |
| 13 |
| 14 namespace chromeos { |
| 15 |
| 16 namespace tether { |
| 17 |
| 18 // Prioritizes the order of devices when performing a host scan. To optimize for |
| 19 // the most common tethering operations, this class uses the following rules: |
| 20 // * The device which has most recently sent a successful |
| 21 // ConnectTetheringResponse is always at the front of the queue. |
| 22 // * Devices which have most recently sent a successful |
| 23 // TetherAvailabilityResponse are next in the order, as long as they do not |
| 24 // violate the first rule. |
| 25 // * All other devices are left in the order they are passed. |
| 26 class HostScanDevicePrioritizer { |
| 27 public: |
| 28 // Note: The PrefService* passed here must be created using the same registry |
| 29 // passed to RegisterPrefs(). |
| 30 HostScanDevicePrioritizer(PrefService* pref_service); |
| 31 ~HostScanDevicePrioritizer(); |
| 32 |
| 33 // Registers the prefs used by this class to |registry|. Must be called before |
| 34 // this class is utilized. |
| 35 static void RegisterPrefs(PrefRegistrySimple* registry); |
| 36 |
| 37 // Records a TetherAvailabilityResponse. This function should be called each |
| 38 // time that a response is received from a potential host, even if a |
| 39 // connection is not started. |
| 40 void RecordSuccessfulTetherAvailabilityResponse( |
| 41 const cryptauth::RemoteDevice& remote_device); |
| 42 |
| 43 // Records a ConnectTetheringResponse. This function should be called each |
| 44 // time that a response is received from a host. |
| 45 void RecordSuccessfulConnectTetheringResponse( |
| 46 const cryptauth::RemoteDevice& remote_device); |
| 47 |
| 48 // Prioritizes |remote_devices| using the rules described above. |
| 49 void SortByHostScanOrder( |
| 50 std::vector<cryptauth::RemoteDevice>* remote_devices) const; |
| 51 |
| 52 private: |
| 53 PrefService* pref_service_; |
| 54 |
| 55 DISALLOW_COPY_AND_ASSIGN(HostScanDevicePrioritizer); |
| 56 }; |
| 57 |
| 58 } // namespace tether |
| 59 |
| 60 } // namespace chromeos |
| 61 |
| 62 #endif // CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_DEVICE_PRIORITIZER_H_ |
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