io.opencensus.tags.propagation

Class TagContextTextFormat.Getter<C>

java.lang.Object

io.opencensus.tags.propagation.TagContextTextFormat.Getter<C>

Type Parameters:

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

Enclosing class:

TagContextTextFormat

public abstract static class TagContextTextFormat.Getter<C>
extends Object

Class that allows a TagContextTextFormat to read propagated fields from a carrier.

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

Since:

0.21

Constructor Summary

Constructors

Constructor and Description
Getter()

Method Summary

Modifier and Type	Method and Description
abstract String	get(C carrier, String key) Returns the first value of the given propagation key or returns null.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Getter

public Getter()

Method Detail

get

@Nullable
public abstract String get(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.

Since:

0.21