Here's my attempt. I don't think you can do much about the imperative
style when you are calling Java APIs unless someone was nice and wrote
a clojure wrapper. But I'm just a n00b.
---
(ns example.servlet.xmpp
(:use [clojure.contrib.logging])
(:import [xmpp.package.here XMPPServiceFactory MessageBuilder]
[xmpp.package.here SendResponse SendResponse$Status])
(:gen-class
:extends javax.servlet.http.HttpServlet))
(defn create-message [recipient body]
(let [builder (doto (MessageBuilder.)
(.withRecipientJids recipient)
(.witBody body))]
(.build builder)))
(defn send-message! [xmpp recipient body]
(let [status (.sendMessage xmpp (create-message recipient body))
result (.. status getStatusMap (get from))]
(= SendResponse$Status/SUCCESS result)))
(defn -doPost [req res]
(try
(let [xmpp (XMPPServiceFactory/getXMPPService)
msg (.parseMessage xmpp req)
from (.getFromJid msg)
body (.getBody msg)]
(info (str "Received a message from " from " and body " body))
(if (send-message! xmpp from (str "You sent me: " body))
(info "Message has been sent successfully.")
(info "Message could not be sent.")))
(catch Exception e
(fatal "Error sending message:" e))))
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