Package com.hazelcast.jet.core

Class Watermark

java.lang.Object
com.hazelcast.jet.core.Watermark
All Implemented Interfaces:
com.hazelcast.jet.impl.execution.BroadcastItem
public final class Watermark
extends Object
implements com.hazelcast.jet.impl.execution.BroadcastItem
Watermark is an item occasionally inserted into a disordered (sub)stream of timestamped items. The watermark's timestamp value has the meaning "no items will follow with timestamp less than this." The value of the watermark is always monotonically increasing in the (sub)stream, with the effect of superimposing an ordered timestamp sequence over the original disordered one. Watermark items are used by windowing processors as anchoring points where the processor knows which windows it can close and emit their aggregated results.
Since:
3.0

  • Constructor Details

    • Watermark

      public Watermark​(long timestamp)
      Constructs a new watermark item.

  • Method Details

    • timestamp

      public long timestamp()
      Returns the timestamp of this watermark item.

    • equals

      public boolean equals​(Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object