NewNodeController returns a new node controller to sync instances from cloudprovider.

Creates new queue which will use given RateLimiter to oversee execution.

RateLimitedTimedQueue is a unique item priority queue ordered by the expected next time of execution.

TimedValue is a value that should be processed at a designated time.

A FIFO queue which additionally guarantees that any element can be added only once until it is removed.

ActionFunc takes a timed value and returns false if the item must be retried, with an optional time.Duration if some minimum wait interval should be used.

TimedQueue is a priority heap where the lowest ProcessAt is at the front of the queue.