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80 lines
2.0 KiB
80 lines
2.0 KiB
4 months ago
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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class EngineInterface;
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class AudioPolicyPluginInterface;
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namespace android {
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namespace audio_policy {
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class Engine;
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class EngineInstance
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{
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protected:
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EngineInstance();
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public:
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virtual ~EngineInstance();
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/**
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* Get Audio Policy Engine instance.
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*
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* @return pointer to Route Manager Instance object.
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*/
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static EngineInstance *getInstance();
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/**
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* Interface query.
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* The first client of an interface of the policy engine will start the singleton.
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*
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* @tparam RequestedInterface: interface that the client is wishing to retrieve.
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*
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* @return interface handle.
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*/
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template <class RequestedInterface>
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RequestedInterface *queryInterface() const;
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protected:
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/**
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* Get Audio Policy Engine instance.
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*
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* @return Audio Policy Engine singleton.
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*/
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Engine *getEngine() const;
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private:
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/* Copy facilities are put private to disable copy. */
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EngineInstance(const EngineInstance &object);
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EngineInstance &operator=(const EngineInstance &object);
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};
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/**
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* Limit template instantation to supported type interfaces.
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* Compile time error will claim if invalid interface is requested.
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*/
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template <>
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EngineInterface *EngineInstance::queryInterface() const;
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template <>
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AudioPolicyPluginInterface *EngineInstance::queryInterface() const;
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} // namespace audio_policy
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} // namespace android
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