org.apache.flink.streaming.api.functions.source

Interface EventTimeSourceFunction<T>

Type Parameters:

T - Type of the elements emitted by this source.

All Superinterfaces:

Function, Serializable, SourceFunction<T>

All Known Implementing Classes:

RichEventTimeSourceFunction

public interface EventTimeSourceFunction<T>
extends SourceFunction<T>

A marker interface that must be implemented by SourceFunctions that emit elements with timestamps. The SourceFunction can extract the timestamp from the data and attach it to the element upon emission.

Event-time sources must manually emit watermarks to keep track of progress. Automatic emission of watermarks will be suppressed if a source implements this interface.

Elements must be emitted using SourceFunction.SourceContext.collectWithTimestamp(Object, long) and watermarks can be emitted using SourceFunction.SourceContext.emitWatermark(org.apache.flink.streaming.api.watermark.Watermark).

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.streaming.api.functions.source.SourceFunction

SourceFunction.SourceContext<T>

Method Summary

Methods inherited from interface org.apache.flink.streaming.api.functions.source.SourceFunction

cancel, run