| Package | Description | 
|---|---|
| com.hazelcast.jet.accumulator | Classes intended to be used for accumulator objects in an  AggregateOperation. | 
| com.hazelcast.jet.aggregate | Contains  AggregateOperationand its several variants, as well
 as a builder object for the aggregate operations. | 
| Modifier and Type | Method and Description | 
|---|---|
| MutableReference | MutableReference. set(T value)Sets the value as given. | 
| Modifier and Type | Method and Description | 
|---|---|
| static <T> AggregateOperation1<T,MutableReference<T>,T> | AggregateOperations. maxBy(ComparatorEx<? super T> comparator)Returns an aggregate operation that computes the greatest item according
 to the given  comparator. | 
| static <T> AggregateOperation1<T,MutableReference<T>,T> | AggregateOperations. minBy(ComparatorEx<? super T> comparator)Returns an aggregate operation that computes the least item according to
 the given  comparator. | 
| static <T,A> AggregateOperation1<T,MutableReference<A>,A> | AggregateOperations. reducing(A emptyAccValue,
        FunctionEx<? super T,? extends A> toAccValueFn,
        BinaryOperatorEx<A> combineAccValuesFn,
        BinaryOperatorEx<A> deductAccValueFn)Returns an aggregate operation that constructs the result through the
 process of immutable reduction:
 
     The initial accumulated value is  emptyAccValue. | 
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