1 // Copyright 2020 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 CAST_SENDER_PUBLIC_CAST_APP_DISCOVERY_SERVICE_H_ 6 #define CAST_SENDER_PUBLIC_CAST_APP_DISCOVERY_SERVICE_H_ 7 8 #include <vector> 9 10 #include "cast/common/public/receiver_info.h" 11 12 namespace openscreen { 13 namespace cast { 14 15 class CastMediaSource; 16 17 // Interface for app discovery for Cast receivers. 18 class CastAppDiscoveryService { 19 public: 20 using AvailabilityCallback = 21 std::function<void(const CastMediaSource& source, 22 const std::vector<ReceiverInfo>& receivers)>; 23 24 class Subscription { 25 public: 26 Subscription(CastAppDiscoveryService* discovery_service, uint32_t id); 27 Subscription(Subscription&&) noexcept; 28 Subscription(Subscription&) = delete; 29 Subscription& operator=(Subscription&&); 30 Subscription& operator=(const Subscription&) = delete; 31 ~Subscription(); 32 33 void Reset(); 34 35 private: 36 friend class CastAppDiscoveryService; 37 38 void Swap(Subscription& other); 39 40 CastAppDiscoveryService* discovery_service_; 41 uint32_t id_; 42 }; 43 44 virtual ~CastAppDiscoveryService() = default; 45 46 // Adds an availability query for |source|. Results will be continuously 47 // returned via |callback| until the returned Subscription is destroyed by the 48 // caller. If there are cached results available, |callback| will be invoked 49 // before this method returns. |callback| may be invoked with an empty list 50 // if all receivers respond to the respective queries with "unavailable" or 51 // don't respond before a timeout. |callback| may be invoked successively 52 // with the same list. 53 virtual Subscription StartObservingAvailability( 54 const CastMediaSource& source, 55 AvailabilityCallback callback) = 0; 56 57 // Refreshes the state of app discovery in the service. It is suitable to call 58 // this method when the user initiates a user gesture. 59 virtual void Refresh() = 0; 60 61 private: 62 virtual void RemoveAvailabilityCallback(uint32_t id) = 0; 63 }; 64 65 } // namespace cast 66 } // namespace openscreen 67 68 #endif // CAST_SENDER_PUBLIC_CAST_APP_DISCOVERY_SERVICE_H_ 69