1 files changed, 94 insertions, 0 deletions
diff --git a/libtransport/src/core/global_module_manager.h b/libtransport/src/core/global_module_manager.h
new file mode 100644
index 000000000..c9d272cdb
--- /dev/null
+++ b/libtransport/src/core/global_module_manager.h
@@ -0,0 +1,94 @@
+/*
+ * 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
+\ No newline at end of file