Package com.hazelcast.jet.aggregate
Interface AggregateOperation1<T,A,R>
- Type Parameters:
T
- the type of the stream itemA
- the type of the accumulatorR
- the type of the aggregation result
- All Superinterfaces:
AggregateOperation<A,
,R> Serializable
Specialization of
AggregateOperation
(refer to its extensive documentation) to the "arity-1" case with
a single data stream being aggregated over. AggregateOperations
contains factories for the built-in implementations and you can create
your own using the aggregate
operation builder.
All the functions must be stateless and cooperative.
- Since:
- Jet 3.0
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Method Summary
Modifier and TypeMethodDescriptionBiConsumerEx<? super A,
? super T> A primitive that updates the accumulator state to account for a new item.<R_NEW> AggregateOperation1<T,
A, R_NEW> andThen
(FunctionEx<? super R, ? extends R_NEW> thenFn) Returns a copy of this aggregate operation, but with theexport
andfinish
primitives composed with the suppliedthenFn
.Deprecated.see AggregateOperations.toCollector(AggregateOperation1)<NEW_T> AggregateOperation1<NEW_T,
A, R> withAccumulateFn
(BiConsumerEx<? super A, ? super NEW_T> accumulateFn) Returns a copy of this aggregate operation, but with theaccumulate
primitive replaced with the one supplied here.Returns a copy of this aggregate operation, but with thefinish
primitive replaced with the identity function.Methods inherited from interface com.hazelcast.jet.aggregate.AggregateOperation
accumulateFn, accumulateFn, arity, combineFn, createFn, deductFn, exportFn, finishFn, withAccumulateFns, withCombiningAccumulateFn
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Method Details
-
accumulateFn
A primitive that updates the accumulator state to account for a new item.The consumer must be stateless and cooperative.
-
withAccumulateFn
@Nonnull <NEW_T> AggregateOperation1<NEW_T,A, withAccumulateFnR> (BiConsumerEx<? super A, ? super NEW_T> accumulateFn) Returns a copy of this aggregate operation, but with theaccumulate
primitive replaced with the one supplied here.The consumer must be stateless and cooperative.
-
withIdentityFinish
Description copied from interface:AggregateOperation
Returns a copy of this aggregate operation, but with thefinish
primitive replaced with the identity function. It will return the accumulator object as-is. The returned aggregate operation does not support theexport
primitive.- Specified by:
withIdentityFinish
in interfaceAggregateOperation<T,
A>
-
andThen
@Nonnull <R_NEW> AggregateOperation1<T,A, andThenR_NEW> (FunctionEx<? super R, ? extends R_NEW> thenFn) Description copied from interface:AggregateOperation
Returns a copy of this aggregate operation, but with theexport
andfinish
primitives composed with the suppliedthenFn
. This replacesexportFn
withexportFn.andThen(thenFn)
, same forfinishFn
. The main use case is to transform the result of an existing (library-provided) aggregate operation.The given function must be stateless and cooperative.
- Specified by:
andThen
in interfaceAggregateOperation<T,
A> - Type Parameters:
R_NEW
- the type of the returned aggregate operation's result- Parameters:
thenFn
- the function to apply to the results ofexport
andfinish
primitives
-
toCollector
Deprecated.
-