RateByServiceTraceSampler

All Implemented Interfaces:

com.datadog.trace.common.sampling.PrioritySampler , com.datadog.trace.common.sampling.Sampler , com.datadog.trace.common.writer.RemoteResponseListener
```
public class RateByServiceTraceSampler
 implements Sampler, PrioritySampler, RemoteResponseListener
                    
```
A rate sampler which maintains different sample rates per service+env name.
The configuration of (serviceName,env)->rate is configured by the core agent.

Field Summary

Fields
Modifier and Type	Field	Description
`public final static String`	`SAMPLING_AGENT_RATE`

Constructor Summary

Constructors
Constructor	Description
`RateByServiceTraceSampler()`
`RateByServiceTraceSampler(Double defaultSampleRate)`

Method Summary

Modifier and Type	Method	Description
`<T extends CoreSpan<T>> boolean`	`sample(T span)`	Sample a collection of traces based on the parent span
`<T extends CoreSpan<T>> void`	`setSamplingPriority(T span)`	If span is a root span, set the span context samplingPriority to keep or drop
`void`	`onResponse(String endpoint, Map<String, Map<String, Number>> responseJson)`	Invoked after the api receives a response from the remote service.
`double`	`getSampleRate()`

Methods inherited from class com.datadog.trace.common.sampling.Sampler
sample
Methods inherited from class com.datadog.trace.common.sampling.PrioritySampler
setSamplingPriority
Methods inherited from class com.datadog.trace.common.writer.RemoteResponseListener
onResponse
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RateByServiceTraceSampler
```
RateByServiceTraceSampler()
```
  - RateByServiceTraceSampler
```
RateByServiceTraceSampler(Double defaultSampleRate)
```
- Method Detail
  - sample
```
 <T extends CoreSpan<T>> boolean sample(T span)
```
    Sample a collection of traces based on the parent span
    
    Parameters:
    
    span - the parent span with its context
  - setSamplingPriority
```
 <T extends CoreSpan<T>> void setSamplingPriority(T span)
```
    If span is a root span, set the span context samplingPriority to keep or drop
  - onResponse
```
 void onResponse(String endpoint, Map<String, Map<String, Number>> responseJson)
```
    Invoked after the api receives a response from the remote service.
  - getSampleRate
```
@VisibleForTesting() double getSampleRate()
```