DemandPacer (SmallRye Mutiny - Core library 1.9.0 API)

All Known Implementing Classes:

FixedDemandPacer
```
@Experimental("Demand pacing is a new experimental API introduced in Mutiny 1.5.0")
public interface DemandPacer
```
Interface for Multi demand pacers and the Multi.paceDemand() operator.
A demand-pacer allows controlling upstream demand using a request and a delay. Each time the delay expires the pacer can evaluate a new demand based on the previous request and the number of emitted items that have been observed since the previous request.
The FixedDemandPacer offers a fixed delay / fixed demand implementation, but custom / adaptive strategies can be provided through this DemandPacer interface.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class DemandPacer.Request
A demand request.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`DemandPacer.Request`	`apply(DemandPacer.Request previousRequest, long observedItemsCount)`	Evaluate the next request after the previous request delay has expired.
`DemandPacer.Request`	`initial()`	Get the initial request.

- Method Detail
  - initial
```
DemandPacer.Request initial()
```
    Get the initial request.
    This will be called at the Multi.paceDemand() operator subscription time.
    
    Returns:
    
    the request, must not be null
  - apply
```
DemandPacer.Request apply(DemandPacer.Request previousRequest,
                          long observedItemsCount)
```
    Evaluate the next request after the previous request delay has expired.
    
    Parameters:
    
    previousRequest - the previous request
    
    observedItemsCount - the number of emitted items that have been observed since the last request
    
    Returns:
    
    the request, must not be null