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/*
* Copyright (c) 2022 Cisco and/or its affiliates.
* 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
#include <glog/logging.h>
#include <hicn/transport/utils/singleton.h>
#ifndef _WIN32
#include <dlfcn.h>
#endif
#include <atomic>
#include <iostream>
#include <mutex>
#include <unordered_map>
namespace transport {
namespace core {
class GlobalModuleManager : public utils::Singleton<GlobalModuleManager> {
public:
friend class utils::Singleton<GlobalModuleManager>;
~GlobalModuleManager() {
for (const auto &[key, value] : modules_) {
unload(value);
}
}
void *loadModule(const std::string &module_name) {
void *handle = nullptr;
const char *error = nullptr;
// Lock
std::unique_lock lck(mtx_);
auto it = modules_.find(module_name);
if (it != modules_.end()) {
return it->second;
}
// open module
handle = dlopen(module_name.c_str(), RTLD_NOW);
if (!handle) {
if ((error = dlerror()) != nullptr) {
LOG(ERROR) << error;
}
return nullptr;
}
auto ret = modules_.try_emplace(module_name, handle);
DCHECK(ret.second);
return handle;
}
void unload(void *handle) {
// destroy object and close module
dlclose(handle);
}
bool unloadModule(const std::string &module_name) {
// Lock
std::unique_lock lck(mtx_);
auto it = modules_.find(module_name);
if (it != modules_.end()) {
unload(it->second);
return true;
}
return false;
}
private:
GlobalModuleManager() = default;
std::mutex mtx_;
std::unordered_map<std::string, void *> modules_;
};
} // namespace core
} // namespace transport
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