| // Copyright 2020 Google LLC |
| // |
| // 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 |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef CORE_INTERNAL_SERVICE_CONTROLLER_ROUTER_H_ |
| #define CORE_INTERNAL_SERVICE_CONTROLLER_ROUTER_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "core/internal/client_proxy.h" |
| #include "core/internal/service_controller.h" |
| #include "core/options.h" |
| #include "core/params.h" |
| #include "platform/base/runnable.h" |
| #include "platform/public/single_thread_executor.h" |
| #include "absl/container/flat_hash_set.h" |
| #include "absl/strings/string_view.h" |
| #include "absl/types/span.h" |
| |
| namespace location { |
| namespace nearby { |
| namespace connections { |
| |
| // ServiceControllerRouter: this class is an implementation detail of a |
| // location::nearby::Core class. The latter delegates all of its activities to |
| // the former. |
| // |
| // All the activities are documented in the public API class: |
| // cpp/core_v2/core.h |
| // |
| // In every method, ClientProxy* represents the client app which receives |
| // notifications from Nearby Connections service and forwards them to the app. |
| // The rest of arguments have the same meaning as the corresponding |
| // methods in the definition of location::nearby::Core API. |
| // |
| // Every activity is handled the same way: |
| // 1) all the arguments to the call are captured by value; |
| // 2) the actual processing is scheduled on a private single-threaded executor, |
| // which makes locking unnecessary, when internal data is being manipulated. |
| // 3) activity handlers are delegating much of their work to an implementation |
| // of a ServiceController interface, which does the actual job. |
| class ServiceControllerRouter { |
| public: |
| explicit ServiceControllerRouter(std::function<ServiceController*()> factory); |
| ~ServiceControllerRouter(); |
| ServiceControllerRouter(ServiceControllerRouter&&) = default; |
| ServiceControllerRouter& operator=(ServiceControllerRouter&&) = default; |
| |
| void StartAdvertising(ClientProxy* client, absl::string_view service_id, |
| const ConnectionOptions& options, |
| const ConnectionRequestInfo& info, |
| const ResultCallback& callback); |
| void StopAdvertising(ClientProxy* client, const ResultCallback& callback); |
| |
| void StartDiscovery(ClientProxy* client, absl::string_view service_id, |
| const ConnectionOptions& options, |
| const DiscoveryListener& listener, |
| const ResultCallback& callback); |
| void StopDiscovery(ClientProxy* client, const ResultCallback& callback); |
| |
| void InjectEndpoint(ClientProxy* client, |
| absl::string_view service_id, |
| const OutOfBandConnectionMetadata& metadata, |
| const ResultCallback& callback); |
| |
| void RequestConnection(ClientProxy* client, absl::string_view endpoint_id, |
| const ConnectionRequestInfo& info, |
| const ConnectionOptions& options, |
| const ResultCallback& callback); |
| void AcceptConnection(ClientProxy* client, absl::string_view endpoint_id, |
| const PayloadListener& listener, |
| const ResultCallback& callback); |
| void RejectConnection(ClientProxy* client, absl::string_view endpoint_id, |
| const ResultCallback& callback); |
| |
| void InitiateBandwidthUpgrade(ClientProxy* client, |
| absl::string_view endpoint_id, |
| const ResultCallback& callback); |
| |
| void SendPayload(ClientProxy* client, |
| absl::Span<const std::string> endpoint_ids, Payload payload, |
| const ResultCallback& callback); |
| void CancelPayload(ClientProxy* client, std::uint64_t payload_id, |
| const ResultCallback& callback); |
| |
| void DisconnectFromEndpoint(ClientProxy* client, |
| absl::string_view endpoint_id, |
| const ResultCallback& callback); |
| void StopAllEndpoints(ClientProxy* client, const ResultCallback& callback); |
| |
| void ClientDisconnecting(ClientProxy* client, const ResultCallback& callback); |
| |
| private: |
| static bool ClientHasConnectionToAtLeastOneEndpoint( |
| ClientProxy* client, const std::vector<std::string>& remote_endpoint_ids); |
| |
| void RouteToServiceController(const std::string& name, Runnable runnable); |
| |
| Status AcquireServiceControllerForClient(ClientProxy* client, |
| Strategy strategy); |
| bool ClientHasAcquiredServiceController(ClientProxy* client) const; |
| void ReleaseServiceControllerForClient(ClientProxy* client); |
| void DoneWithStrategySessionForClient(ClientProxy* client); |
| Status UpdateCurrentServiceControllerAndStrategy(Strategy strategy); |
| |
| absl::flat_hash_set<ClientProxy*> clients_; |
| std::function<ServiceController*()> service_controller_factory_; |
| std::unique_ptr<ServiceController> service_controller_; |
| Strategy current_strategy_; |
| SingleThreadExecutor serializer_; |
| }; |
| |
| } // namespace connections |
| } // namespace nearby |
| } // namespace location |
| |
| #endif // CORE_INTERNAL_SERVICE_CONTROLLER_ROUTER_H_ |