I find WeakReferences when implementing observer pattern: A service generate events and signal listeners that the event was triggered. This usually requires the service to have a list to all of the listeners. Now, without weak refernece it means that any temporary listener will not be garbage collected and thus we will have memory grow without limits, since the listeners will not be collected as they are referenced by the service. When it comes to this, WeakReferences are mandatory and unfortunately Go doesn't support them :'(
terça-feira, 5 de Março de 2013 às 23:13:05 UTC, Steve McCoy escreveu: > > > > On Tuesday, March 5, 2013 5:43:35 PM UTC-5, Jan Mercl wrote: >> >> On Tue, Mar 5, 2013 at 11:24 PM, Dustin Sallings <dsal...@gmail.com> >> wrote: >> > Strong reference: "hands off, gc" >> > Weak reference: "0 this if no strong reference exists" >> > Soft refernce: "0 this if no strong reference exists and we're >> low >> > on RAM" >> >> This is magic, even though feasible by the runtime. Go excels in >> explicitness, even though that may mean more user coding. My feeling >> is that those two approaches don't mix well, to put it mildly. >> >> -j >> > > It's not magic; it's not as though people won't know they have an instance > of a weak reference on their hands. > > Anyhow, I don't care if Go ever gets them, but there are other fun things > that can be done with weak references that don't have anything to do with > caches. I wrote a Java tool+package that keeps track of every object > created while the program runs and asserts some preconditions whenever an > object is accessed. Of course, memory would be extremely wasted if I kept > them all in a map with strong references for the keys, so I instead used a > WeakHashMap, allowing the garbage collector to clean things up in a typical > fashion. Using explicit reference counting would've been painful for that. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/19d2f189-4dc6-406b-bd1e-45c1deeef054%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
