Package io.helidon.common.reactive

Class RequestedCounter

java.lang.Object

io.helidon.common.reactive.RequestedCounter

public class RequestedCounter
extends java.lang.Object

Requested event counter. This utility class helps to safely track and tryProcess the back-pressure of Flow.Subscribers.

Constructor Summary

Constructors

Constructor	Description
RequestedCounter()

Method Summary

Modifier and Type	Method	Description
long	get()	Gets the current requested event counter value.
void	increment(long increment, java.util.function.Consumer<? super java.lang.IllegalArgumentException> errorHandler)	Increments safely a requested event counter to prevent Long.MAX_VALUE overflow.
boolean	tryDecrement()	Tries to safely decrement a positive requested counter value, making sure the value does not drop below zero.

Methods inherited from class java.lang.Object

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

Constructor Detail

RequestedCounter

public RequestedCounter()

Method Detail

increment

public void increment(long increment,
                      java.util.function.Consumer<? super java.lang.IllegalArgumentException> errorHandler)

Increments safely a requested event counter to prevent Long.MAX_VALUE overflow.

Parameters:

increment - amount of additional events to request.

errorHandler - a consumer of IllegalArgumentException to process errors

tryDecrement

public boolean tryDecrement()

Tries to safely decrement a positive requested counter value, making sure the value does not drop below zero.

Returns:

true if the initial positive value has been decremented successfully, false in case the initial counter value was already set to zero.

get

public long get()

Gets the current requested event counter value.

Returns:

current value of the requested event counter.