Package org.apache.flink.streaming.api.windowing.evictors

Class DeltaEvictor<T,W extends org.apache.flink.streaming.api.windowing.windows.Window>

java.lang.Object
org.apache.flink.streaming.api.windowing.evictors.DeltaEvictor<T,W>
Type Parameters:
W - The type of Windows on which this Evictor can operate.
All Implemented Interfaces:
Serializable, org.apache.flink.streaming.api.windowing.evictors.Evictor<T,W>
@PublicEvolving public class DeltaEvictor<T,W extends org.apache.flink.streaming.api.windowing.windows.Window> extends Object implements org.apache.flink.streaming.api.windowing.evictors.Evictor<T,W>
An Evictor that keeps elements based on a DeltaFunction and a threshold.

Eviction starts from the first element of the buffer and removes all elements from the buffer which have a higher delta then the threshold.

See Also:

  • Nested Class Summary

    Nested classes/interfaces inherited from interface org.apache.flink.streaming.api.windowing.evictors.Evictor

    org.apache.flink.streaming.api.windowing.evictors.Evictor.EvictorContext

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    evictAfter(Iterable<org.apache.flink.streaming.runtime.operators.windowing.TimestampedValue<T>> elements, int size, W window, org.apache.flink.streaming.api.windowing.evictors.Evictor.EvictorContext ctx)
     
    void
    evictBefore(Iterable<org.apache.flink.streaming.runtime.operators.windowing.TimestampedValue<T>> elements, int size, W window, org.apache.flink.streaming.api.windowing.evictors.Evictor.EvictorContext ctx)
     
    static <T, W extends org.apache.flink.streaming.api.windowing.windows.Window>
    DeltaEvictor<T,W>
    of(double threshold, DeltaFunction<T> deltaFunction)
    Creates a DeltaEvictor from the given threshold and DeltaFunction.
    static <T, W extends org.apache.flink.streaming.api.windowing.windows.Window>
    DeltaEvictor<T,W>
    of(double threshold, DeltaFunction<T> deltaFunction, boolean doEvictAfter)
    Creates a DeltaEvictor from the given threshold, DeltaFunction.
    String
    toString()
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Method Details

    • evictBefore

      public void evictBefore(Iterable<org.apache.flink.streaming.runtime.operators.windowing.TimestampedValue<T>> elements, int size, W window, org.apache.flink.streaming.api.windowing.evictors.Evictor.EvictorContext ctx)
      Specified by:
      evictBefore in interface org.apache.flink.streaming.api.windowing.evictors.Evictor<T,W extends org.apache.flink.streaming.api.windowing.windows.Window>

    • evictAfter

      public void evictAfter(Iterable<org.apache.flink.streaming.runtime.operators.windowing.TimestampedValue<T>> elements, int size, W window, org.apache.flink.streaming.api.windowing.evictors.Evictor.EvictorContext ctx)
      Specified by:
      evictAfter in interface org.apache.flink.streaming.api.windowing.evictors.Evictor<T,W extends org.apache.flink.streaming.api.windowing.windows.Window>

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • of

      public static <T, W extends org.apache.flink.streaming.api.windowing.windows.Window> DeltaEvictor<T,W> of(double threshold, DeltaFunction<T> deltaFunction)
      Creates a DeltaEvictor from the given threshold and DeltaFunction. Eviction is done before the window function.
      Parameters:
      threshold - The threshold
      deltaFunction - The DeltaFunction

    • of

      public static <T, W extends org.apache.flink.streaming.api.windowing.windows.Window> DeltaEvictor<T,W> of(double threshold, DeltaFunction<T> deltaFunction, boolean doEvictAfter)
      Creates a DeltaEvictor from the given threshold, DeltaFunction. Eviction is done before/after the window function based on the value of doEvictAfter.
      Parameters:
      threshold - The threshold
      deltaFunction - The DeltaFunction
      doEvictAfter - Whether eviction should be done after window function