Re: Formatting a date

On Mon, 27 Mar 2006, Alex Twisleton-Wykeham-Fiennes wrote:

| On Mon 27 March 2006 11:28, Marc Palmer wrote:
| > On 27 Mar 2006, at 11:13, Alex Twisleton-Wykeham-Fiennes wrote:
| > > On Mon 27 March 2006 11:00, Marc Palmer wrote:
| > >> On 27 Mar 2006, at 02:47, Sven Schliesing wrote:
| > >>> That's exactly what I looked for.
| > >>
| > >> There's another, potentially cleaner way...
| > >>
| > >> ----------------- "mymacros.wmm":
| > >>
| > >> #macro formatDate($d)
| > >>     $Text.formatDate($d, "dd.MM.yyyy, HH:mm")
| > >> #end
| > >>
| > >> ----------------- "yourtemplate.wmt":
| > >>
| > >> #include as macro "mymacros.wmm"
| > >>
| > >> #formatDate($createdAt)
| > >
| > > Just to jump in for a moment - this will create a new
| > > SimpleDateFormat object
| > > every single time that it is invoked.  If you know that you are
| > > going to be
| > > formatting a lot of different dates with the same format then it is
| > > considerably more efficient to drop in a dedicated wrapper around
| > > an instance
| > > of SimpleDateFormat that gives you the format that you want as
| > > otherwise each
| > > time that you invoke it, it will have to parse your "dd.MM.yyyy,
| > > HH:mm"
| > > format string, build the internal representation and then format
| > > the Date
| > > which is relatively expensive.
| >
| > You're absolutely right, but that can be dealt with using a macro
| > plus a #bean to create a "static" shared instance of the formatter?
| 
| I'll also look at making $Text.formatDate cache the SimpleTextFormat objects 
| that it creates and run some profiling to see whether or not this is really 
| an advantage...

And where should this cache reside? In which context? Who's gonna clean 
it? When? How? (And how do I reload my webapp in Tomcat?)

Caches on every corner, under every rock, in every creek, and in other 
unknown places, is the way to evil code.

Regards,
Endre.


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