Package org.apache.camel.component.reactive.streams

Enum ReactiveStreamsBackpressureStrategy

java.lang.Object

java.lang.Enum<ReactiveStreamsBackpressureStrategy>

org.apache.camel.component.reactive.streams.ReactiveStreamsBackpressureStrategy

All Implemented Interfaces:

Serializable, Comparable<ReactiveStreamsBackpressureStrategy>

public enum ReactiveStreamsBackpressureStrategy
extends Enum<ReactiveStreamsBackpressureStrategy>

A list of possible backpressure strategy to use when the emission of upstream items cannot respect backpressure.

Enum Constant Summary

Enum Constants

Enum Constant	Description
BUFFER	Buffers all onNext values until the downstream consumes it.
LATEST	Keeps only the latest onNext value, overwriting any previous value if the downstream can't keep up.
OLDEST	Keeps only the oldest onNext value, discarding any future value until it's consumed by the downstream subscriber.

Method Summary

Modifier and Type	Method	Description
abstract <T> Collection<T>	update(Deque<T> buffer, T newItem)	Updates the buffer and returns a list of discarded elements (if any).
static ReactiveStreamsBackpressureStrategy	valueOf(String name)	Returns the enum constant of this type with the specified name.
static ReactiveStreamsBackpressureStrategy[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

BUFFER

public static final ReactiveStreamsBackpressureStrategy BUFFER

Buffers all onNext values until the downstream consumes it.

OLDEST

public static final ReactiveStreamsBackpressureStrategy OLDEST

Keeps only the oldest onNext value, discarding any future value until it's consumed by the downstream subscriber.

LATEST

public static final ReactiveStreamsBackpressureStrategy LATEST

Keeps only the latest onNext value, overwriting any previous value if the downstream can't keep up.

Method Detail

values

public static ReactiveStreamsBackpressureStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ReactiveStreamsBackpressureStrategy c : ReactiveStreamsBackpressureStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ReactiveStreamsBackpressureStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

update

public abstract <T> Collection<T> update(Deque<T> buffer,
                                         T newItem)

Updates the buffer and returns a list of discarded elements (if any).

Type Parameters:

T - the generic type of the element

Parameters:

buffer - the buffer to update

newItem - the elment that should possibly be inserted

Returns:

the list of discarded elements