Module net.pincette.rs

Package net.pincette.rs

Class Accumulator<T,U>

java.lang.Object

net.pincette.rs.Accumulator<T,U>

All Implemented Interfaces:

Flow.Subscriber<T>

public class Accumulator<T,U>
extends Object
implements Flow.Subscriber<T>

Accumulates a publisher and when that's done it calls the provided function. With the get method you obtain the final result.

Since:

1.3

Author:

Werner Donné

Constructor Summary

Constructors

Constructor	Description
Accumulator(Function<Stream<T>,CompletionStage<U>> reducer)	Constructs the accumulator with a reducer.
Accumulator(Function<Stream<T>,CompletionStage<U>> reducer, UnaryOperator<T> copy)	Constructs the accumulator with a reducer.

Method Summary

Modifier and Type	Method	Description
static <T, U> Flow.Subscriber<T>	accumulator(Function<Stream<T>,CompletionStage<U>> reducer)
static <T, U> Flow.Subscriber<T>	accumulator(Function<Stream<T>,CompletionStage<U>> reducer, UnaryOperator<T> copy)
CompletionStage<U>	get()	Returns the reduced value when the stage is complete.
void	onComplete()
void	onError(Throwable t)
void	onNext(T value)
void	onSubscribe(Flow.Subscription subscription)

Methods inherited from class java.lang.Object

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

Constructor Details

Accumulator

public Accumulator(Function<Stream<T>,CompletionStage<U>> reducer)

Constructs the accumulator with a reducer.

Parameters:

reducer - the reducer function.

Since:

1.3

Accumulator

public Accumulator(Function<Stream<T>,CompletionStage<U>> reducer,
 UnaryOperator<T> copy)

Constructs the accumulator with a reducer.

Parameters:

reducer - the reducer function.

copy - the function that copies the values before they are accumulated. It may be null.

Since:

3.0.1

Method Details

accumulator

public static <T,
U> Flow.Subscriber<T> accumulator(Function<Stream<T>,CompletionStage<U>> reducer)

accumulator

public static <T,
U> Flow.Subscriber<T> accumulator(Function<Stream<T>,CompletionStage<U>> reducer,
 UnaryOperator<T> copy)

get

public CompletionStage<U> get()

Returns the reduced value when the stage is complete.

Returns:

The stage to received the reduced value.

Since:

1.3

onComplete

public void onComplete()

Specified by:

onComplete in interface Flow.Subscriber<T>

onError

public void onError(Throwable t)

Specified by:

onError in interface Flow.Subscriber<T>

onNext

public void onNext(T value)

Specified by:

onNext in interface Flow.Subscriber<T>

onSubscribe

public void onSubscribe(Flow.Subscription subscription)

Specified by:

onSubscribe in interface Flow.Subscriber<T>