1 /*
2  * Copyright 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <functional>
20 #include <memory>
21 #include <string>
22 
23 #include <EngineInterface.h>
24 
25 namespace android {
26 
27 using EngineInstance = std::unique_ptr<EngineInterface, std::function<void (EngineInterface*)>>;
28 
29 class EngineLibrary : public std::enable_shared_from_this<EngineLibrary> {
30 public:
31     static std::shared_ptr<EngineLibrary> load(std::string libraryPath);
32     ~EngineLibrary();
33 
34     EngineLibrary(const EngineLibrary&) = delete;
35     EngineLibrary(EngineLibrary&&) = delete;
36     EngineLibrary& operator=(const EngineLibrary&) = delete;
37     EngineLibrary& operator=(EngineLibrary&&) = delete;
38 
39     EngineInstance createEngine();
40 
41 private:
42     EngineLibrary() = default;
43     bool init(std::string libraryPath);
44     void close();
45 
46     void *mLibraryHandle = nullptr;
47     EngineInterface* (*mCreateEngineInstance)() = nullptr;
48     void (*mDestroyEngineInstance)(EngineInterface*) = nullptr;
49 };
50 
51 }  // namespace android
52