## Uses of Interface
org.apache.storm.streams.operations.BiFunction

- Packages that use BiFunction
  Package | Description
  --- | ---
  org.apache.storm.streams |
  org.apache.storm.streams.operations |

- - ### Uses of BiFunction in org.apache.storm.streams

    Methods in org.apache.storm.streams with parameters of type BiFunction
    Modifier and Type | Method | Description
    --- | --- | ---
    `<R> Stream<R>` | Stream.`aggregate​(R initialValue, BiFunction<? super R,​? super T,​? extends R> accumulator, BiFunction<? super R,​? super R,​? extends R> combiner)` | Aggregates the values in this stream using the given initial value, accumulator and combiner.
    `<R> PairStream<K,​R>` | PairStream.`aggregateByKey​(R initialValue, BiFunction<? super R,​? super V,​? extends R> accumulator, BiFunction<? super R,​? super R,​? extends R> combiner)` | Aggregates the values for each key of this stream using the given initial value, accumulator and combiner.
    `<R> StreamState<K,​R>` | PairStream.`updateStateByKey​(R initialValue, BiFunction<? super R,​? super V,​? extends R> stateUpdateFn)` | Update the state by applying the given state update function to the previous state of the key and the new value for the key.

  - ### Uses of BiFunction in org.apache.storm.streams.operations

    Subinterfaces of BiFunction in org.apache.storm.streams.operations
    Modifier and Type | Interface | Description
    --- | --- | ---
    `interface` | `Reducer<T>` | The `Reducer` performs an operation on two values of the same type producing a result of the same type.

    Methods in org.apache.storm.streams.operations with parameters of type BiFunction
    Modifier and Type | Method | Description
    --- | --- | ---
    `static <T,​R> CombinerAggregator<T,​R,​R>` | CombinerAggregator.`of​(R initialValue, BiFunction<? super R,​? super T,​? extends R> accumulator, BiFunction<? super R,​? super R,​? extends R> combiner)` | A static factory to create a `CombinerAggregator` based on initial value, accumulator and combiner.
    `static <T,​S> StateUpdater<T,​S>` | StateUpdater.`of​(S initialValue, BiFunction<? super S,​? super T,​? extends S> stateUpdateFn)` | A static factory to create a `StateUpdater` based on an initial value of the state and a state update function.