Re: [WebMacro-user] Formatting a date

[Keats K. <ke...@xa...>]

Good catch Endre!  Glad I didn't go down that path yet.  Perhaps we 
should look for an alternative date formatting system.  I found 
something called Joda Time on SourceForge (http://www.joda.org/) that 
looks like it might fit the bill.  From their FAQ:

"The most common multi-threading mistake made by Java programmers is in 
the use of SimpleDateFormat. Calling its format method on a shared 
instance by concurrent threads can produce bizarre results. All of 
Joda-Time's formatting classes are thread-safe and immutable."

They also claim it is faster than SimpleDateFormat.

Keats

Endre Stølsvik wrote:

>...
>
>| Is (Simple)DateFormat itself completely thread-safe, by contract?
>
>Forgot to point out that you obvioulsy may just do both the map-lookup 
>_and_ the formatting within the one synch-block (but then you can forget 
>the benefit of ConcurrentHashMap) - or you could have a pool of each 
>format - say 10 instances - and actually do "connection pooling" logic.
>  But at that point, I do hope that more than me thinks that having "one 
>more cached resource" (with the synch and potential contention hit (now 
>both for the synch and the formatting-time), and "memory bloat") for that 
>amazingly little benefit (e.g. 1 ms for 40 formattings) isn't worth the 
>hassle?
>
>Add a method to dateTool that actually gives you a DateFormat back, and 
>javadoc both methods where the users are told to use the 
>DateFormat-returning one if they're about to format multiple dates in one 
>rendering.
>
>Regards,
>Endre.
>  
>