Package com.oracle.coherence.concurrent.executor

Class ConditionalCollector<T,A,R>

java.lang.Object

com.oracle.coherence.concurrent.executor.ConditionalCollector<T,A,R>

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 Implemented Interfaces:

Task.Collector<T,List<T>,R>, ExternalizableLite, PortableObject, Serializable

public class ConditionalCollector<T,A,R>
extends Object
implements Task.Collector<T,List<T>,R>, PortableObject

A Task.Collector that conditionally collects values based on the available result.

Since:

21.12

Author:

bo

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Task.Collector<T,A,R>	m_collector	The Task.Collector to use when the Remote.Predicate is satisfied.
protected R	m_defaultResult	The default result to return when the Remote.Predicate is not satisfied.
protected Remote.Predicate<? super Iterator<T>>	m_predicate	The Remote.Predicate to determine when results can be collected.

Constructor Summary

Constructors

Constructor	Description
ConditionalCollector()	For serialization.
ConditionalCollector(Remote.Predicate<? super Iterator<T>> predicate, Task.Collector<? super T,A,R> collector, R defaultResult)	Constructs a ConditionalCollector.

Method Summary

Modifier and Type	Method	Description
BiConsumer<List<T>,T>	accumulator()	A function that folds Task results into a mutable result container.
Remote.Predicate<List<T>>	finishable()	A Remote.Predicate to determine if a result container can be finished early avoiding further accumulation of results using the container.
Function<List<T>,R>	finisher()	Perform the final transformation from the intermediate accumulation type A to the final result type R.
void	readExternal(PofReader in)
void	readExternal(DataInput in)
Supplier<List<T>>	supplier()	A function that creates and returns a new mutable result container.
void	writeExternal(PofWriter out)
void	writeExternal(DataOutput out)

Methods inherited from class java.lang.Object

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

Field Detail

m_predicate

protected Remote.Predicate<? super Iterator<T>> m_predicate

The Remote.Predicate to determine when results can be collected.

m_collector

protected Task.Collector<T,A,R> m_collector

The Task.Collector to use when the Remote.Predicate is satisfied.

m_defaultResult

protected R m_defaultResult

The default result to return when the Remote.Predicate is not satisfied.

Constructor Detail

ConditionalCollector

public ConditionalCollector()

For serialization.

ConditionalCollector

public ConditionalCollector(Remote.Predicate<? super Iterator<T>> predicate,
                            Task.Collector<? super T,A,R> collector,
                            R defaultResult)

Constructs a ConditionalCollector.

Parameters:

predicate - the Remote.Predicate to determine if collection should occur

collector - the Task.Collector to use when the Remote.Predicate is satisfied

defaultResult - the default result to use when the Remote.Predicate is not satisfied

Method Detail

accumulator

public BiConsumer<List<T>,T> accumulator()

Description copied from interface: Task.Collector

A function that folds Task results into a mutable result container.

Specified by:

accumulator in interface Task.Collector<T,A,R>

Returns:

a function that folds Task results into a mutable result container

finishable

public Remote.Predicate<List<T>> finishable()

Description copied from interface: Task.Collector

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 Task.Collector.finisher() will occur regardless of the result returned by the Remote.Predicate.

Specified by:

finishable in interface Task.Collector<T,A,R>

Returns:

a Remote.Predicate

finisher

public Function<List<T>,R> finisher()

Description copied from interface: Task.Collector

Perform the final transformation from the intermediate accumulation type A to the final result type R.

Specified by:

finisher in interface Task.Collector<T,A,R>

Returns:

a function which transforms the intermediate result to the final result

supplier

public Supplier<List<T>> supplier()

Description copied from interface: Task.Collector

A function that creates and returns a new mutable result container.

Specified by:

supplier in interface Task.Collector<T,A,R>

Returns:

a function which returns a new mutable result container

readExternal

public void readExternal(DataInput in)
                  throws IOException

Specified by:

readExternal in interface ExternalizableLite

Throws:

IOException

writeExternal

public void writeExternal(DataOutput out)
                   throws IOException

Specified by:

writeExternal in interface ExternalizableLite

Throws:

IOException

readExternal

public void readExternal(PofReader in)
                  throws IOException

Specified by:

readExternal in interface PortableObject

Throws:

IOException

writeExternal

public void writeExternal(PofWriter out)
                   throws IOException

Specified by:

writeExternal in interface PortableObject

Throws:

IOException