Method get_or_create

packages/server/src/simulators/registry.rs:31–42

(&self, key: &str, create: F)

    }

    fn get_or_create<F, E>(&self, key: &str, create: F) -> Result<T, E>
    where
        F: FnOnce() -> Result<T, E>,
    {
        let mut guard = self.sessions.lock().unwrap();
        if let Some(value) = guard.get(key) {
            return Ok(value.clone());
        }
        let value = create()?;
        guard.insert(key.to_owned(), value.clone());
        Ok(value)
    }

    fn remove(&self, key: &str) {
        self.sessions.lock().unwrap().remove(key);