This class is a specialized
SlidingWindowUtilizationAggregator implementation which
calculates the utilization or, (which is more precisely in the scope of this class), the average
load) of an active resource based on a sequence of
(point in time, state of active resource) or
(point in time, utilization of active resource) tuples collected by a
SlidingWindow by employing the algorithm that is used in the Linux kernel to compute the
average load (Details of this algorithm can be found
in this paper, or more
succinctly,
in this presentation
both due to Neil Gunther).