Concurrent Set Queue

Question

Maybe this is a silly question, but I cannot seem to find an obvious answer.

I need a concurrent FIFO queue that contains only unique values. Attempting to add a val

Answer 1

A java.util.concurrent.ConcurrentLinkedQueue gets you most of the way there.

Wrap the ConcurrentLinkedQueue with your own class that checks for the uniqueness of an add. Your code has to be thread safe.