Nocode class and method selectors

[johnbley]

Add logic for more complex class/method selectors than just exact-name-matching:

• and
• or
• not
• hasSuperType
• named
• nameMatches (regex)
• hasParameterCount
• hasParameterOfType (index, type)

I tried to keep the list/complexity as small as possible while still accounting for 95%+ of real-world usage. I had to add a separate -testing module to work around a classloader issue in order to properly test all the invalid parse logic.

A larger classloader problem I encountered was that the yaml is clearly specifying bytebuddy ElementMatchers (and the logic for producing and using them is pretty clean since the feature set offered by bytebuddy is so complete), but bytebuddy classes are not visible to the bootstrap-located Rule class. Rather than wrap the ElementMatcher logic in a bootstrap-only shim class, for now I'm exposing them as simple Objects (with some comments) since they are never used or invoked at the bootstrap layer. It's not a great design, and I'm happy to code up anything better that anybody else comes up with. Lauri suggested a fix separating a bootstrap interface for Rule from a RuleImpl in agent space which can safely reference the ElementMatcher directly. Thanks, Lauri!

[robsunday]

And one more question. YAML files for declarative config use snake case naming convention, rather than camelCase. Maybe we should use the same?

[johnbley]

And one more question. YAML files for declarative config use snake case naming convention, rather than camelCase. Maybe we should use the same?

Good call. I updated all the old stuff to snake_case too (e.g., span_status instead of spanStatus, and touched up the docs as well.

[laurit]

an alternative that could be considered would be to use text blocks since the tests run with java 17

[johnbley]

I'll see what's available when I reformat this whole thing for -contrib.

[laurit]

I'll change the return type to ElementMatcher<? extends NamedElement>. This will push the unchecked cast to the caller of the parse method in matcherFromKeyAndYamlValue.