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

Class ReduceApplyWindowFunction<K,W extends Window,T,R>

java.lang.Object
org.apache.flink.api.common.functions.AbstractRichFunction
org.apache.flink.api.common.functions.WrappingFunction<WindowFunction<T,R,K,W>>
org.apache.flink.streaming.api.functions.windowing.ReduceApplyWindowFunction<K,W,T,R>
All Implemented Interfaces:
Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction, WindowFunction<T,R,K,W>
@Internal public class ReduceApplyWindowFunction<K,W extends Window,T,R> extends org.apache.flink.api.common.functions.WrappingFunction<WindowFunction<T,R,K,W>> implements WindowFunction<T,R,K,W>
Internal WindowFunction that is used for implementing a fold on a window configuration that only allows WindowFunction and cannot directly execute a ReduceFunction.
See Also:

  • Field Summary

    Fields inherited from class org.apache.flink.api.common.functions.WrappingFunction

    wrappedFunction

  • Constructor Summary

    Constructors
    Constructor
    Description
    ReduceApplyWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, WindowFunction<T,R,K,W> windowFunction)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    apply(K k, W window, Iterable<T> input, org.apache.flink.util.Collector<R> out)
    Evaluates the window and outputs none or several elements.

    Methods inherited from class org.apache.flink.api.common.functions.WrappingFunction

    close, getWrappedFunction, open, setRuntimeContext

    Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

    getIterationRuntimeContext, getRuntimeContext

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • ReduceApplyWindowFunction

      public ReduceApplyWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, WindowFunction<T,R,K,W> windowFunction)

  • Method Details

    • apply

      public void apply(K k, W window, Iterable<T> input, org.apache.flink.util.Collector<R> out) throws Exception
      Description copied from interface: WindowFunction
      Evaluates the window and outputs none or several elements.
      Specified by:
      apply in interface WindowFunction<K,W extends Window,T,R>
      Parameters:
      k - The key for which this window is evaluated.
      window - The window that is being evaluated.
      input - The elements in the window being evaluated.
      out - A collector for emitting elements.
      Throws:
      Exception - The function may throw exceptions to fail the program and trigger recovery.