com.hazelcast.jet.core.function

## Interface KeyedWindowResultFunction<K,R,OUT>

- Type Parameters:
    `K` - type of the key
    `R` - the type of aggregation result this function receives
    `OUT` - the type of the output item this function returns
  All Superinterfaces:
    Serializable
  Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

      @FunctionalInterface
      public interface KeyedWindowResultFunction<K,R,OUT>
      extends Serializable

  Represents the function you pass to windowing processors such as `aggregateToSlidingWindowP()` and `aggregateToSessionWindowP()` as `mapToOutputFn`. It creates the item to emit based on the results of a single aggregate operation performed for a particular window and a particular grouping key.
  Since:
    3.0

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `OUT` | `apply(long winStart, long winEnd, K key, R windowResult, boolean isEarly)` Applies the function to the given arguments

- - ### Method Detail

    - #### apply

          @Nullable
          OUT apply(long winStart,
                              long winEnd,
                              @Nonnull
                              K key,
                              @Nonnull
                              R windowResult,
                              boolean isEarly)

      Applies the function to the given arguments
      Parameters:
        `winStart` - the inclusive lower timestamp of the window
        `winEnd` - the exclusive upper timestamp of the window
        `key` - the grouping key
        `windowResult` - the result of the aggregate operation
        `isEarly` - whether the result is an early result as specified by `WindowDefinition.setEarlyResultsPeriod(long)`
      Returns:
        the function result

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