Psychic Origami » dayjob http://www.psychicorigami.com folding with my brain Wed, 03 Aug 2011 19:13:30 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Class of the day: ConcurrentHashMap http://www.psychicorigami.com/2007/03/12/class-of-the-day-concurrenthashmap/ http://www.psychicorigami.com/2007/03/12/class-of-the-day-concurrenthashmap/#comments Mon, 12 Mar 2007 20:47:22 +0000 john http://www.psychicorigami.com/2007/03/12/class-of-the-day-concurrenthashmap/ Well today at work involved me using ConcurrentHashMap and in particular putIfAbsent to severely reduce the need for old-school synchronized blocks.

Just a shame that you can’t pass in arbitrary expressions/blocks that will only be evaluated if the value isn’t present when you call putIfAbsent. Might become feasible if Java gets closures. There’s definitely some power in the java.util.concurrent package though.

Still it’s been a while since I’ve had that kind of satisfaction writing Java code.

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