Package io.opentelemetry.context.propagation

Interface TextMapGetter<C>

Type Parameters:

C - carrier of propagation fields, such as an http request.

public interface TextMapGetter<C>

Interface that allows a TextMapPropagator to read propagated fields from a carrier.

Getter is stateless and allows to be saved as a constant to avoid runtime allocations.

Method Summary

Modifier and Type	Method	Description
String	get(C carrier, String key)	Returns the first value of the given propagation key or returns null.
Iterable<String>	keys(C carrier)	Returns all the keys in the given carrier.

Method Details

keys

Iterable<String> keys(C carrier)

Returns all the keys in the given carrier.

Parameters:

carrier - carrier of propagation fields, such as an http request.

Since:

0.10.0

get

@Nullable
String get(@Nullable
 C carrier,
 String key)

Returns the first value of the given propagation key or returns null.

Parameters:

carrier - carrier of propagation fields, such as an http request.

key - the key of the field.

Returns:

the first value of the given propagation key or returns null.