TraceContext.Extractor (Brave 5.15.0 API)

Enclosing class:

TraceContext
```
public static interface TraceContext.Extractor<R>
```
Used to continue an incoming trace. For example, by reading http headers.
Note: This type is safe to implement as a lambda, or use as a method reference as it is effectively a FunctionalInterface. It isn't annotated as such because the project has a minimum Java language level 6.

Since:

4.0

See Also:

Tracer.nextSpan(TraceContextOrSamplingFlags)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`TraceContextOrSamplingFlags`	`extract(R request)`	Returns either a trace context or sampling flags parsed from the request.

- Method Detail
  - extract
```
TraceContextOrSamplingFlags extract(R request)
```
    Returns either a trace context or sampling flags parsed from the request. If nothing was parsable, sampling flags will be set to SamplingFlags.EMPTY.
    
    Parameters:
    
    request - holds propagation fields. For example, an incoming message or http request.