Use annotation to mark the method you want to trace.
- Add
@Trace
to any method you want to trace. After that, you can see the span in the Stack. - Methods annotated with
@Tag
will try to tag the current active span with the given key (Tag#key()
) and (Tag#value()
), if there is no active span at all, this annotation takes no effect.@Tag
can be repeated, and can be used in companion with@Trace
, see examples below. Thevalue
ofTag
is the same as what are supported in Customize Enhance Trace.
/**
* The codes below will generate a span,
* and two types of tags,
one type tag: keys are `tag1` and `tag2`, values are the passed-in parameters, respectively,
the other type tag: keys are `username` and `age`, values are the return value in User, respectively
*/
@Trace
@Tag(key = "tag1", value = "arg[0]")
@Tag(key = "tag2", value = "arg[1]")
@Tag(key = "username", value = "returnedObj.username")
@Tag(key = "age", value = "returnedObj.age")
public User methodYouWantToTrace(String param1, String param2) {
// ...
}
Sample codes only