org.pentaho.di.trans.streaming.api

Interface StreamWindow<I,O>

All Known Implementing Classes:

FixedTimeStreamWindow

public interface StreamWindow<I,O>

A StreamWindow governs buffering and sending rows to a sub-transformation. Windowing strategies could include sending buffered rows * after a given interval * on a sliding interval * after a fixed number of rows have been read. *

Method Summary

Modifier and Type	Method and Description
Iterable<O>	buffer(io.reactivex.Observable<I> observable) Takes an iterable (would typically be a StreamSource.observable()} call) and buffers it according to the window strategy.

Method Detail

buffer

Iterable<O> buffer(io.reactivex.Observable<I> observable)

Takes an iterable (would typically be a StreamSource.observable()} call) and buffers it according to the window strategy. Returns an iterable of data for the window. Depending on stream implementation, the output could also be transformed. For example, the FixedTimeStreamWindow will pass windowed data to a subtransformation, and return the transformed results.