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107 lines
2.9 KiB
107 lines
2.9 KiB
/** |
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* Copyright (C) 2016 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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#ifndef PLUGIN_LOADER_H_ |
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#define PLUGIN_LOADER_H_ |
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#include "SharedLibrary.h" |
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#include <utils/Log.h> |
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#include <utils/String8.h> |
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#include <utils/Vector.h> |
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namespace android { |
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namespace hardware { |
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namespace drm { |
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namespace V1_0 { |
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namespace helper { |
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template <class T> |
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class PluginLoader { |
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public: |
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PluginLoader(const char *dir, const char *entry) { |
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/** |
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* scan all plugins in the plugin directory and add them to the |
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* factories list. |
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*/ |
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String8 pluginDir(dir); |
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DIR* pDir = opendir(pluginDir.string()); |
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if (pDir == NULL) { |
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ALOGE("Failed to find plugin directory %s", pluginDir.string()); |
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} else { |
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struct dirent* pEntry; |
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while ((pEntry = readdir(pDir))) { |
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String8 file(pEntry->d_name); |
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if (file.getPathExtension() == ".so") { |
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String8 path = pluginDir + "/" + pEntry->d_name; |
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T *plugin = loadOne(path, entry); |
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if (plugin) { |
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factories.push(plugin); |
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} |
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} |
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} |
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closedir(pDir); |
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} |
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} |
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~PluginLoader() { |
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for (size_t i = 0; i < factories.size(); i++) { |
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delete factories[i]; |
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} |
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} |
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T *getFactory(size_t i) const { |
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return factories[i]; |
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} |
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size_t factoryCount() const {return factories.size();} |
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private: |
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T* loadOne(const char *path, const char *entry) { |
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sp<SharedLibrary> library = new SharedLibrary(String8(path)); |
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if (!library.get()) { |
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ALOGE("Failed to open plugin library %s: %s", path, |
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library->lastError()); |
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} else { |
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typedef T *(*CreateFactoryFunc)(); |
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CreateFactoryFunc createFactoryFunc = |
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(CreateFactoryFunc)library->lookup(entry); |
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if (createFactoryFunc) { |
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ALOGV("Found plugin factory entry %s in %s", entry, path); |
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libraries.push(library); |
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T* result = createFactoryFunc(); |
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return result; |
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} |
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} |
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return NULL; |
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} |
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Vector<T *> factories; |
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Vector<sp<SharedLibrary> > libraries; |
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PluginLoader(const PluginLoader &) = delete; |
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void operator=(const PluginLoader &) = delete; |
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}; |
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} |
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} |
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} |
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} |
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} // namespace android |
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#endif // PLUGIN_LOADER_H_ |
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