[concurrency-interest] LIFO ThreadPoolExecutor

Andrew Wason rectalogic@yahoo.com
Fri, 29 Oct 2004 19:20:46 -0700 (PDT)

I want to use a single thread ThreadPoolExecutor that
internally uses a LIFO - basically what I would get
from Executors.newSingleThreadExecutor() but using a

I'm queuing up thumbnail decoding tasks as the user
scrolls through a list of thumbnails - so I want the
most recently exposed thumbnail to be the first to be

I don't see a BlockingQueue<E> LIFO implementation
that I can use with ThreadPoolExecutor, so what would
be the simplest way to do what I need?

I could use a PriorityBlockingQueue<E> and always add
new tasks as the 'least' element so they are at the
head. Or I could use LinkedBlockingQueue<E> and every
time I add a task, first drainTo(), add the new task,
then addAll() the other tasks back.

I could subclass LinkedBlockingQueue<E> and override
various methods to reimplement it as a LIFO (if
LinkedBlockingQueue<E>.insert() was not private this
would be simple). I'm afraid this approach will be
brittle as the JDK implementation changes underneath

Does anyone have any suggestions as to the best


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