Clojure reloaded workflow without libraries

look_ma_no_frameworks.clj

(extend-type Object
  Closable
  (.close [o] o))

(defn closable-jetty [server]
  (reify Closable (close [_] (.stop server))))

(defn start []
  (let [system (promise)]
    (future
      (with-open [config (read (slurp "config.edn")) ; Via hack above
                  db-connection (open-connection (:db config))
                  handler (make-handler db-connection) ; Via hack above
                  server (closable-jetty (run-jetty handler))
                  stop (promise)] ; Via hack above
        (deliver system {:config config
                         :db-connection db-connection
                         :handler handler
                         :server server
                         :stop (fn [] (deliver stop nil))})
        @stop))
    system))