Task.Collector (Java API Reference for Oracle® Coherence Community Edition)

Type Parameters:

T - the type of input elements to the reduction operation

A - the mutable accumulation type of the reduction operation (often hidden as an implementation detail)

R - the result type of the reduction operation

All Superinterfaces:

com.tangosol.io.ExternalizableLite, Serializable

All Known Implementing Classes:

AbstractCollector, ConditionalCollector, TaskCollectors.CountCollector, TaskCollectors.FirstOfCollector, TaskCollectors.LastOfCollector, TaskCollectors.ListOfCollector, TaskCollectors.SetOfCollector

Enclosing interface:

Task<T>
```
public static interface Task.Collector<T,A,R>
extends com.tangosol.io.ExternalizableLite
```
A mutable reduction operation that accumulates results into a mutable result container, optionally transforming the accumulated result into a final representation after all results have been processed.

See Also:

Collector

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`BiConsumer<A,T>`	`accumulator()`	A function that folds `Task` results into a mutable result container.
`com.tangosol.util.function.Remote.Predicate<A>`	`finishable()`	A `Remote.Predicate` to determine if a result container can be finished early avoiding further accumulation of results using the container.
`Function<A,R>`	`finisher()`	Perform the final transformation from the intermediate accumulation type A to the final result type R.
`Supplier<A>`	`supplier()`	A function that creates and returns a new mutable result container.

Methods inherited from interface com.tangosol.io.ExternalizableLite
readExternal, writeExternal

- Method Detail
  - accumulator
```
BiConsumer<A,T> accumulator()
```
    A function that folds Task results into a mutable result container.
    
    Returns:
    
    a function that folds Task results into a mutable result container
  - finisher
```
Function<A,R> finisher()
```
    Perform the final transformation from the intermediate accumulation type A to the final result type R.
    
    Returns:
    
    a function which transforms the intermediate result to the final result
  - finishable
```
com.tangosol.util.function.Remote.Predicate<A> finishable()
```
    A Remote.Predicate to determine if a result container can be finished early avoiding further accumulation of results using the container.
    Should there be no further results to accumulate, finishing the result container with the finisher() will occur regardless of the result returned by the Remote.Predicate.
    
    Returns:
    
    a Remote.Predicate
  - supplier
```
Supplier<A> supplier()
```
    A function that creates and returns a new mutable result container.
    
    Returns:
    
    a function which returns a new mutable result container