Method registerResource

libminifi/src/core/ClassLoader.cpp:36–82

}

uint16_t ClassLoader::registerResource(const std::string &resource, const std::string &resourceFunction) {
  void *resource_ptr = nullptr;
  if (resource.empty()) {
    dlclose(dlopen(0, RTLD_LAZY | RTLD_GLOBAL));
    resource_ptr = dlopen(0, RTLD_NOW | RTLD_GLOBAL);
  } else {
    dlclose(dlopen(resource.c_str(), RTLD_LAZY | RTLD_GLOBAL));
    resource_ptr = dlopen(resource.c_str(), RTLD_NOW | RTLD_GLOBAL);
  }
  if (!resource_ptr) {
    return RESOURCE_FAILURE;
  } else {
    std::lock_guard<std::mutex> lock(internal_mutex_);
    dl_handles_.push_back(resource_ptr);
  }

  // reset errors
  dlerror();

  // load the symbols
  createFactory* create_factory_func = reinterpret_cast<createFactory*>(dlsym(resource_ptr, resourceFunction.c_str()));
  const char* dlsym_error = dlerror();
  if ((dlsym_error != nullptr && strlen(dlsym_error) > 0) || create_factory_func == nullptr) {
    return RESOURCE_FAILURE;
  }

  ObjectFactory *factory = create_factory_func();

  std::lock_guard<std::mutex> lock(internal_mutex_);

  auto initializer = factory->getInitializer();
  if (initializer != nullptr) {
    if (!initializer->initialize()) {
      delete factory;
      return RESOURCE_FAILURE;
    }
    initializers_.emplace_back(std::move(initializer));
  }

  for (auto class_name : factory->getClassNames()) {
    loaded_factories_[class_name] = std::unique_ptr<ObjectFactory>(factory->assign(class_name));
  }

  delete factory;

  return RESOURCE_SUCCESS;
}

} /* namespace core */
} /* namespace minifi */