blob: a25dd41586d8bf05b5f47746fbd832b291a457c9 [file] [log] [blame]
/**
* Copyright (C) 2016 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.
*/
#ifndef PLUGIN_LOADER_H_
#define PLUGIN_LOADER_H_
#include "SharedLibrary.h"
#include <android-base/strings.h>
#include <utils/Log.h>
#include <utils/String8.h>
#include <utils/Vector.h>
namespace android {
namespace hardware {
namespace drm {
namespace V1_0 {
namespace helper {
template <class T>
class PluginLoader {
public:
PluginLoader(const char *dir, const char *entry) {
/**
* scan all plugins in the plugin directory and add them to the
* factories list.
*/
String8 pluginDir(dir);
DIR* pDir = opendir(pluginDir.c_str());
if (pDir == NULL) {
ALOGE("Failed to find plugin directory %s", pluginDir.c_str());
} else {
struct dirent* pEntry;
while ((pEntry = readdir(pDir))) {
String8 file(pEntry->d_name);
if (base::EndsWith(file.c_str(), ".so")) {
String8 path = pluginDir + "/" + pEntry->d_name;
T* plugin = loadOne(path.c_str(), entry);
if (plugin) {
factories.push(plugin);
}
}
}
closedir(pDir);
}
}
~PluginLoader() {
for (size_t i = 0; i < factories.size(); i++) {
delete factories[i];
}
}
T *getFactory(size_t i) const {
return factories[i];
}
size_t factoryCount() const {return factories.size();}
private:
T* loadOne(const char *path, const char *entry) {
sp<SharedLibrary> library = new SharedLibrary(String8(path));
if (!library.get()) {
ALOGE("Failed to open plugin library %s: %s", path,
library->lastError());
} else {
typedef T *(*CreateFactoryFunc)();
CreateFactoryFunc createFactoryFunc =
(CreateFactoryFunc)library->lookup(entry);
if (createFactoryFunc) {
ALOGV("Found plugin factory entry %s in %s", entry, path);
libraries.push(library);
T* result = createFactoryFunc();
return result;
} else {
ALOGE("Failed to lookup symbol %s in library %s: %s",
entry, path, library->lastError());
}
}
return NULL;
}
Vector<T *> factories;
Vector<sp<SharedLibrary> > libraries;
PluginLoader(const PluginLoader &) = delete;
void operator=(const PluginLoader &) = delete;
};
}
}
}
}
} // namespace android
#endif // PLUGIN_LOADER_H_