When is Scala going to trash?

Question

This question relates to Scala objects, which are defined something like this:

object Pipeline {
   val dispatcher = new Dispatcher
}

I know that in some cases they are called “companion” objects, although I still do not understand the difference. Anyway, I want to know when they collect garbage. So, in the above example, I would like to know when the memory occupied dispatcherwill be restored, if ever.

Answer 1

jave - lazyily . Java , , , , . .

Answer 2

Pipeline "", ( Java), , . , -

object Pipeline {
    var dispatcher = Some(new Dispatcher)
    def close() { dispatcher = None }
}

Answer 3

, , . , , dispatcher , (, ).

In addition to manually resetting the field dispatcherto make the corresponding object dispatcheravailable for collection, you can always automate this process using SoftReference.