in dubbo/src/registry/memory_registry.rs [72:87]
fn unregister(&mut self, url: dubbo_base::Url) -> Result<(), crate::StdError> {
let registry_group = match url.get_param(REGISTRY_GROUP_KEY) {
Some(key) => key,
None => "dubbo".to_string(),
};
let dubbo_path = format!(
"/{}/{}/{}",
registry_group,
url.get_service_name(),
"provider",
);
self.registries.write().unwrap().remove(&dubbo_path);
Ok(())
}