AdaptiveSampleFilter (Payara Project 6.2022.1.Alpha3 API)

java.lang.Object
- fish.payara.nucleus.requesttracing.sampling.SampleFilter
- - fish.payara.nucleus.requesttracing.sampling.AdaptiveSampleFilter

```
public class AdaptiveSampleFilter
extends SampleFilter
```
SampleFilter that changes the sample rate dynamically to meet a given target.

Field Summary

Fields
Modifier and Type Field Description

protected Clock clock
The clock to use to get the current time.
- Fields inherited from class fish.payara.nucleus.requesttracing.sampling.SampleFilter
  sampleRate

Constructor Summary

Constructors
Constructor	Description
`AdaptiveSampleFilter(double sampleRate, Integer targetCount, Integer targetTimeValue, TimeUnit targetTimeUnit)`	Initialises the sample filter with a specified initial sample rate and target.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

boolean sample()
Whether to sample or not.
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - clock
```
protected Clock clock
```
    The clock to use to get the current time. Absolute time is irrelevant, but this allows relative time to be changed in testing to remove time dependency.
- Constructor Detail
  - AdaptiveSampleFilter
```
public AdaptiveSampleFilter(double sampleRate,
                            Integer targetCount,
                            Integer targetTimeValue,
                            TimeUnit targetTimeUnit)
```
    Initialises the sample filter with a specified initial sample rate and target.
    
    Parameters:
    
    sampleRate - the initial rate at which to sample requests.
    
    targetCount - the target number of requests to match in a time frame.
    
    targetTimeValue - the value for the time frame.
    
    targetTimeUnit - the unit of the value for the time frame.
- Method Detail
  - sample
```
public boolean sample()
```
    Description copied from class: SampleFilter
    
    Whether to sample or not.
    
    Overrides:
    
    sample in class SampleFilter
    
    Returns:
    
    true if the request should be sampled, or false otherwise.