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;; Se define en un modulo una funcion polimorfica en funcion del tipo | |
;; de los *dos argumentos* | |
(ns modulo1) | |
(defmulti write (fn [writer data] [(type writer) (:type data)]) | |
;; En otro modulo que importa la definicion anterior generica de write | |
(ns modulo2 (require modulo1)) | |
(defmethod modulo1/write [java.io.FileWriter :user] [writer user] | |
(comment codigo especifico usando el FileWriter y teniendo en cuenta | |
que los datos son del tipo :usuario)) | |
(defmethod modulo1/write [java.io.CharArrayWriter :user] [writer user] | |
(.write writer (str user))) | |
(def writer (java.io.CharArrayWriter.)) | |
(modulo1/write writer {:name "jmarranz" :type "user"}) | |
(str writer) | |
;; "{:name "jmarranz" :type "user"}" | |
(defmethod modulo1/write [java.io.FileWriter :session] [writer session] | |
(comment otro codigo que usa FileWriter pero especifico para | |
el tipo :session)) | |
;; En otro modulo | |
(ns modulo3 (use modulo1)) | |
(defmethod write [SQLWriter :user] [w u] | |
(comment codigo que escribe los datos del usuario en la db)) |
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