2) yes, the producer waits until the list is empty. But you need to wait in a loop that chacks the condition you're waiting for to guard against spurious wake ups (= being awoken when there was no notification.) see tech-read.com/2010/01/28/spurious-wakeup-in-java for a brief explanation or consult Effective Java or Java Concurrency in Practice if you have either available.

@ChristianHujer Note that I'm saying disposing is fine. Just that after closing the last frame the application does not end. There's no code in place to actually exit.

@ChristianHujer actually my output varied from 601 to 1501 nanos on a Intel Core i7-3770 CPU @ 3.40Ghz 3.40GHz on Oracle's 1.8.0_25 JVM. The b<<2 looks a little faster than b+b+b+b+a on average but not much. Both are around 1201. 4*b+a is around 3603 as I said before the edit.

As it is, the code you have can not work. There are missing semicolons, use of a non existing logger field and calling the constructor of an abstract class...