multimethods clojure

sample.clj

;you have a map with a key :action
;this contains a known list of actions:
;:login, :register, :play, :logout

(defmulti appy-action :action)

;input looks like this 
;{:action :login :username "test" :password "test"}
(defmethod apply-action :login [msg]
   (let [username (:username msg)
         password (:password msg)]
		 ...))
		 
(defmethod apply-action :logout [msg]
   (let [username (:username msg)]
     ...))
	 
(defmethod apply-action :play [msg]
   (let [move (:move msg)]
     ...)) 
	 
(defmethod appply-action :register [msg]
   (let [username (:username msg)
         password (:password msg)]
		 ...))