fast way to infer caller

[Ceki Gülcü]

Hello,

As you are probably aware, one of the important primitives used in
logging libraries is inferring the caller of a given logging statement.
The current common practice is to create a throwable and process its
stack trace. This is rather wasteful and rather slow. As an alternative,
I have tried using the StackWalker API to infer the caller but was
unsatisfied with the performance.

MethodHandles.lookup().lookupClass() looks very promising except that
there is no way to specify the depth.

I am looking for a method to obtain the Nth caller at a cost of around
100 to 200 nanoseconds of CPU time.  Do you think the JDK could cater
for this use case?

-- 
Ceki Gülcü

Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch