Feature/6.1/tracing util

[TravisWhip]

Added a simple utility to create tracing Spans.

Closable spans

These spans are wrapped in a Closable class so they are ended when out of scope. Spans can be easily created to track a method / given scope with.

Example usages

I have added a span around the initial load.

  private void initialLoad() {
    @Cleanup var span = TracingUtil.startSpan("Initial CSV Data Load");
    ... method body ...
  }

This gives us a span with sub-spans:

Automatic closing of Span when out of scope:

void myMethod(){
  @Cleanup var span = TracingUtil.startSpan(); // Span with name "MyClass.myMethod" is created & started
  ... method code ...
  ... Span is automatically closed at the end of this method's scope due to lombok's @Cleanup annotation.
}

Spans can be kept open:

class MyClass {
  TracingUtil.ClosableSpan span;

  void start(){
    span = TracingUtil.startSpan("My multi-method span");
  }
  void end(){
    span.close();
  }
}

Cleanup still required

The property TracingUtil.defaultTracingScopeName is static and set at startup from a Void bean which may not be the cleanest.