hi clojure-community,
yesterday i came across the following use of
the delay-macro:
(defn pooled-data-source
[db-connection-settings]
; this Fn creates and returns object of type PooledDataSource
)
(defn pooled-data-source-as-singleton
[db-connection-settings]
(let [datasource (delay (pooled-data-source db-connection-
settings))]
@datasource))
i am not sure, what the exact semantic of this is and if
it's safe in a multithreaded context.
What is the difference to using def/defonce ?
Someone who can explain ?
thanks & have a nice time
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