org.apache.commons.functor.aggregator (Apache Commons Functor 1.0-SNAPSHOT API)

Interface Summary
Interface	Description
Aggregator<T>	Interface which offers a means of "aggregating" data.
TimedAggregatorListener<T>	Listener to be used with instances of `AbstractTimedAggregator` to receive notifications when the timer kicks in.

Class Summary
Class	Description
AbstractListBackedAggregator<T>	An aggregator which stores the data series in a List.
AbstractNoStoreAggregator<T>	An implementation of an aggregator which doesn't store the data series but instead it processes the data on the fly, as it arrives in `AbstractTimedAggregator.add(Object)` and stores the result after each addition.
AbstractTimedAggregator<T>	An aggregator which automatically resets the aggregated data at regular intervals and sends a notification when it is about to do so, so listeners can decide to gather the information before it is being reset (and log it etc).
ArrayListBackedAggregator<T>	Implementation of an aggregator which stores the data series in an `ArrayList`.

Package org.apache.commons.functor.aggregator Description

This package contains the interfaces and utilities needed to implement an aggregation service.

Aggregation refers to being able to add data to a data "sink" which "aggregates" them automatically (e.g. sum them up or average, median etc).

An example of an aggregation service is being able to average a series of int values (perhaps generated from a monitoring component) and be able to constantly report on the average (or mean) value of this series. There is no specification about the maximum amount of data that can be aggregated -- some subclasses might impose such restrictions, if that is the case then that will be specified in their JavaDoc's.