NewExpireQueue returns ExpireQueue.

NewLinkedQueue make a LinkedQueue.

NewQueue returns a Queue.

NewSortedQueue returns a SortedQueue.

ExpireQueue provides sequential expirations by groups.

LinkedQueue is designed to allow users to remove the item by the key.

Queue provides a basic queue ability with the peek method.

SortedQueue sorts items by the priority.

ItemExpireHandler handles a group expire event.