Optimization pack 2

[oswaldobapvicjr]

Enhancement

This Pull Request introduces the following optimization:

Reduce time unit conversion overhead

The Counter class was originally designed so that the times collected by the Counter instances could be maintained in different TimeUnits as specified by the constructor Counter(Type, TimeUnit).

This flexibility comes with a cost: all units are converted during time-source fetching. However, in practice, only "nanoseconds" were used. Removing this feature means we no longer need intermediary time unit conversions. Now, the Counter class, by definition, will store amounts in nanoseconds, making the class cleaner and faster.

With this simplification, we also removed the "default time unit" setting that used to be applied when no other was specified.

NOTE: Elapsed times can still be converted normally using a TimingSession or a TimingSessionContainer (such as Stopwatch) but the units are stored only as nanoseconds at the Counter level.

Other minor improvements

• SystemUtils class optimization:
  • Store a local reference for the ThreadMXBean instance, avoiding repeated lookups for this Managed Bean
• Optimize counters map handling inside the TimingSession class:
  • Remove bad usage of Map.containsKey(String) which caused the same key to be searched twice during the getCounter(Type) operation
• Extract a common method for some duplicate code found inside DurationUtils

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2638e21) to head (002a48f).

Additional details and impacted files

@@              Coverage Diff              @@
##             master       #78      +/-   ##
=============================================
+ Coverage     99.51%   100.00%   +0.48%     
- Complexity      323       326       +3     
=============================================
  Files            21        21              
  Lines           832       831       -1     
  Branches         35        34       -1     
=============================================
+ Hits            828       831       +3     
+ Misses            1         0       -1     
+ Partials          3         0       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.