Thanks for the Future pointers. I actually used it, but didn't know it by name.
Otis --- Jeremy Rayner <[EMAIL PROTECTED]> wrote: > On 4/26/05, Otis Gospodnetic <[EMAIL PROTECTED]> wrote: > > Also, is "a future for a hit" a typo, or does that actually mean > > something? This makes me think of Python's "future", but I'm not > sure > > what this means in this context. > > My feeling originally was that as the obtaining of the document > was expensive, a Hit should be a bit like the 'Future Value' pattern, > where a Hit is just a promise to delve into Hits with a certain index > at some point in the future. > ( see http://c2.com/cgi/wiki?FutureValue ) > Which interestingly enough now seems to be implemented in Doug Lea's > changes for Java 5 > ( > http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/Future.html > ) > > Although without the asynchronous element, I guess it is just lazy > initialization. > > An alternative implementation of Hit could be a 'Virtual > Proxy(GOF:207)' that stores > a delegate FutureHit or ActualHit, the FutureHit could be the > starting > position, but after any call the delegates reference is swapped over > to ActualHit. This would eliminate the check of 'resolved' at the > start > of each method, and therefore increase perfomance. However a memory > overhead would be incurred for the overhead of having three classes > instead of one. > So it's a better perfomance vs less memory usage tradeoff. > > Thanks for allowing this change, it has now turned my previous Groovy > example > ( http://javanicus.com/blog2/items/178-index.html ) from > > for ( i in 0 ..< hits.length() ) { > println(hits.doc(i)["filename"]) > } > > into > > hits.each{ > println(it.filename) > } > > which has far less chances for making typos :-) > > jez. > -- > http://javanicus.com/blog2 > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
