RequestedCounter (Helidon Project 2.6.9 API)

java.lang.Object
- io.helidon.common.reactive.RequestedCounter

```
public class RequestedCounter
extends Object
```
Requested event counter. This utility class helps to safely track and process the back-pressure of Flow.Subscribers.

Constructor Summary

Constructors
Constructor	Description
`RequestedCounter()`	Create new request counter with strict mode off.
`RequestedCounter(boolean strictMode)`	Create new request counter, with strict mode true are all operations with counter protected by lock.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`get()`	Gets the current requested event counter value.
`void`	`increment(long increment, Consumer<? super IllegalArgumentException> errorHandler)`	Increments safely a requested event counter to prevent `Long.MAX_VALUE` overflow.
`void`	`lock()`	Lock internal counter if strict mode is on.
`boolean`	`tryDecrement()`	Tries to safely decrement a positive requested counter value, making sure the value does not drop below zero.
`void`	`unlock()`	Unlock internal counter.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RequestedCounter
```
public RequestedCounter()
```
    Create new request counter with strict mode off.
  - RequestedCounter
```
public RequestedCounter(boolean strictMode)
```
    Create new request counter, with strict mode true are all operations with counter protected by lock.
    
    Parameters:
    
    strictMode - true for turning strict mode on
- Method Detail
  - increment
```
public void increment(long increment,
                      Consumer<? super 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.
  - lock
```
public void lock()
```
    Lock internal counter if strict mode is on.
  - unlock
```
public void unlock()
```
    Unlock internal counter.
  - get
```
public long get()
```
    Gets the current requested event counter value.
    
    Returns:
    
    current value of the requested event counter.