Java – android/java – Find efficient concurrent loop queues

Does anyone know of a (open source) implementation of a bounded consistent loop queue, or an available API class built into android/java?

The concurrent (non-synchronous or lock-based) operations I need for this set are at least enqueue and dequeue, but enqueue is enough.

For those who aren’t sure which Collection I need, here is some more information:

• bounded – There is the maximum number of items that can be inside.
• Concurrency – Allows multiple threads to run operations efficiently without any type of locking. This is in contrast to the synchronous solution, which only allows a single thread to run operations.
• Loop – If we put an item into a populated collection, the new item replaces the oldest item.

Please help