Hi,
Something I don't understand: if the call to (API/getConnection ...)
fails, there is nothing to close, right ?
So for the problem of ensuring that any open connection is always
closed, the following pattern seems enough:
(try
(let [conn (API/getConnection ..)]
XXX)
(finally (API/closeConnection conn)))
In XXX you can do your business job, maybe catching exceptions, etc.,
but that is not the same intent as ensuring pairs of open/close calls
in any case.
Smart java frameworks such as SpringFramework do the exact same thing
by using Interface callbacks encapsulating the XXX "real interesting
code".
The less verbose way of doing this is clojure's with-open macro.
Though you would have, as Alex pointed out, to create your own variant
of with-open to accomodate your particular API for closing the
connection.
Or, if you use master, you could write the protocol-aware version of
with-open :-)
2010/4/21 ka <sancha...@gmail.com>:
> Hi,
>
> I'm using an API to connect to a server which does not provide
> constructors, just static methods to get & close connections.
>
> How can I do something like ...
>
> (try
> (let [conn (API/getConnection ..)]
> (....))
> (catch ..)
> (finally (if conn (API/closeConnection conn))))
>
> Problem is that conn is unavailable in the finally context.
>
> Is there any easy workaround which doesn't involve defing a global
> conn.
>
> - Thanks
>
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