what's the best way to poll a queue in a loop? I s...

# announcements

[tschuchort]

what's the best way to poll a queue in a loop? I suppose a normal for-loop wouldn't remove the elements from the queue

[Andreas Sinz]

blocking or non-blocking?

[tschuchort]

non-blocking. The loop should terminate after the queue is empty

[Andreas Sinz]

then I'd go with a simple while(true) { val item = queue.poll(); if(item == null) break ... }

[tschuchort]

That's what I ended up with but it doesn't look idiomatic

[Andreas Sinz]

@tschuchort you can write your own iterator:

class QueueIterator<T>(private val queue: Queue<T>) : Iterator<T> {
    override fun hasNext() = queue.peek() != null

    override fun next() = queue.poll()
}

fun Queue<T>.pollIterator() = QueueInterator(this)

and then use it like this for(item in queue.pollIterator()) { ... }