PushbackPolicy

Type Parameters:

T - The type of the data

U - The type of the queue

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@ConsumerType
@FunctionalInterface
public interface PushbackPolicy<T,U extends java.util.concurrent.BlockingQueue<PushEvent<? extends T>>>
```
A PushbackPolicy is used to calculate how much back pressure to apply based on the current buffer. The PushbackPolicy will be called after an event has been queued, and the returned value will be used as back pressure.

See Also:

PushbackPolicyOption

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`pushback(U queue)`	Given the current state of the queue, determine the level of back pressure that should be applied

- Method Detail
  - pushback
```
long pushback(U queue)
       throws java.lang.Exception
```
    Given the current state of the queue, determine the level of back pressure that should be applied
    
    Parameters:
    
    queue -
    
    Returns:
    
    a back pressure value in nanoseconds
    
    Throws:
    
    java.lang.Exception