Iv stumbled this also when using Threads, (http://
javadevelopmentforthemasses.blogspot.com/2009/07/easiest-singleton-
around.html)
user=> (defn singleton-factory []
(println "creating object")
(+ 1 2))
user=> (use 'clojure.contrib.singleton)
nil
user=> (def t-singleton (per-thread-singleton singleton-factory))
#'user/t-singleton
user=> (defn use-twice [] (+ 1 (t-singleton)) (+ 1 (t-singleton)))
#'user/use-twice
user=> (. (Thread. use-twice) start)
nil
user=> creating object ; REPL prints on the wrong line
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