If you use a java.util.WeakHashMap (and resist the temptation to mutate it instead of making modified copies) and the name objects are interned (so any two that are equal are identical -- so, as usual, you want to use :clojure :keywords), then name->node mappings get auto-GC'd if the name stops being in use anywhere else. (Just don't include a copy of the name *inside* the node with that name. It shouldn't be needed because you should never have a node in hand without having first had the name, in this architecture. If for any reason it *is* needed store it as a string instead of a keyword so it won't be the same interned object, but can be converted into such with (keyword foo).)
On Mon, Sep 9, 2013 at 8:05 PM, Mark Engelberg <mark.engelb...@gmail.com>wrote: > There's one other big downside to the mapping-from-names-to-nodes > technique that I forgot to mention. If you plan to delete connections > between nodes, and the structure is intricate enough that you don't know > whether you can safely delete the node itself, then you can potentially end > up with orphan name->node pairs in your mapping that are unnecessary. > Cleaning these up would basically mean you'd have to write your own garbage > collection routines. > > If you work with real pointers, you get garbage collection for free. > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
