Package org.apache.beam.sdk.state

Interface WatermarkHoldState

All Superinterfaces:

GroupingState<Instant,Instant>, ReadableState<Instant>, State

@Internal
public interface WatermarkHoldState
extends GroupingState<Instant,Instant>

For internal use only; no backwards-compatibility guarantees.

A State accepting and aggregating timestamps according to a TimestampCombiner, holding the output watermark to the resulting timestamp.

Method Summary

Modifier and Type	Method	Description
TimestampCombiner	getTimestampCombiner()	Return the TimestampCombiner which will be used to determine a watermark hold time given an element timestamp, and to combine watermarks from windows which are about to be merged.
WatermarkHoldState	readLater()	Indicate that the value will be read later.

Methods inherited from interface org.apache.beam.sdk.state.GroupingState

add, isEmpty

Methods inherited from interface org.apache.beam.sdk.state.ReadableState

read

Methods inherited from interface org.apache.beam.sdk.state.State

clear

Method Details

getTimestampCombiner

TimestampCombiner getTimestampCombiner()

Return the TimestampCombiner which will be used to determine a watermark hold time given an element timestamp, and to combine watermarks from windows which are about to be merged.

readLater

WatermarkHoldState readLater()

Description copied from interface: ReadableState

Indicate that the value will be read later.

This allows an implementation to start an asynchronous prefetch or to include this state in the next batch of reads.

Specified by:

readLater in interface GroupingState<Instant,Instant>

Specified by:

readLater in interface ReadableState<Instant>

Returns:

this for convenient chaining