/* * Copyright (C) 2015 The Android Open Source Project * * 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 * * http://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. */ #pragma once class AudioPolicyManagerInterface; class AudioPolicyPluginInterface; namespace android { namespace audio_policy { class Engine; class EngineInstance { protected: EngineInstance(); public: virtual ~EngineInstance(); /** * Get Audio Policy Engine instance. * * @return pointer to Route Manager Instance object. */ static EngineInstance *getInstance(); /** * Interface query. * The first client of an interface of the policy engine will start the singleton. * * @tparam RequestedInterface: interface that the client is wishing to retrieve. * * @return interface handle. */ template <class RequestedInterface> RequestedInterface *queryInterface() const; protected: /** * Get Audio Policy Engine instance. * * @return Audio Policy Engine singleton. */ Engine *getEngine() const; private: /* Copy facilities are put private to disable copy. */ EngineInstance(const EngineInstance &object); EngineInstance &operator=(const EngineInstance &object); }; /** * Limit template instantation to supported type interfaces. * Compile time error will claim if invalid interface is requested. */ template <> AudioPolicyManagerInterface *EngineInstance::queryInterface() const; template <> AudioPolicyPluginInterface *EngineInstance::queryInterface() const; }; // namespace audio_policy }; // namespace android