org.terracotta.statistics.observer

Interface ChainedObserver

All Known Subinterfaces:

ChainedEventObserver, ChainedOperationObserver<T>

All Known Implementing Classes:

EventParameterSimpleMovingAverage, EventRateSimpleMovingAverage, LatencySampling, MinMaxAverage, OperationResultFilter

public interface ChainedObserver

The marker interface implemented by all statistic observer classes.

A statistic observer presents methods used to update a statistic. There are two general classes of observer implementations:

1. Initial observers are called by product code in order to record the occurrence of a product related 'event'
2. Derived observers are called by other observers with then intention of tracking higher order statistics.