This page gives some advice to create a new Aggregation function.

This page is under construction.

Interfaces for a new function

An aggregation function needs to implement one of the following interfaces:

• de.uniol.inf.is.odysseus.aggregation.functions.IIncrementalAggregationFunction
  An incremental aggregation functions gets a notification when an element gets valid (enters the window) or gets invalid (leaves the window). You have to hold a state to return the current aggregation value on request. 
  • void addNew(T newElement);
    This function is called when a new element gets valid. You should add this value to the state.
    For example AVG function: State holds sum and count. sum += newElement and count++ 
• de.uniol.inf.is.odysseus.aggregation.functions.INonIncrementalAggregationFunction