[jbosscache-dev] New collections

Guys, I have created 3 new collection impls in trunk - ImmutableListCopy, ImmutableSetCopy and ImmutableMapCopy. I have also ported the first 2 to branch 2.2.x (the reason why I didnt port the third is because the MapCopy which it replaces can get serialized and I don't want to break binary compat). See the Javadoc of these classes for more details, but in a nutshell these are very efficient alternatives to the "immutable and defensively copied" idiom. I.e., if you ever find yourself doing: return Collections.unmodifiableList(new ArrayList(internalList)) you should consider ImmutableListCopy instead. Constructon time is about a tenth of the combined time it takes to create an ArrayList and then wrap it in an UnmodifiableList. Also, iteration is very quick since the internal array is immutable. Please keep this in mind when working on JBC code. Cheers, -- Manik Surtani Lead, JBoss Cache manik(a)jboss.org