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clj-web-from-the-ground-up-3.md

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component

add deps

[com.stuartsierra/component "1.1.0"]
[ring-jetty-component "0.3.1"]

(:require [ring.component.jetty :refer [jetty-server]]
          [com.stuartsierra.component :as component])

(defn app-system
  []
  (component/system-map
    :http (jetty-server {:app {:handler app}, :port 3000})))

(defn -main
  "I don't do a whole lot ... yet."
  [& args]
  (component/start (app-system)))

lein run

reloadable workflow

add dep [reloaded.repl "0.2.4"]

add dev profile

:profiles {:dev {:source-paths ["dev"]}
           ..} 
:repl-options {:init-ns user}

dev/user.clj

(ns user
  (:require [reloaded.repl :refer [system init start stop go reset reset-all]]
            [clj-web.core :refer [app-system]]))

(reloaded.repl/set-init! app-system)

lein repl You can now manipulate the system in the REPL: (go)/(start), (reset) or (stop)

Change the code & (reset) to see if it affect!