ThreadUtils thread count adjusted to limited value to avoid lockups

[echicoine-icf]

Adjusted ThreadUtils after discovering macOS/linux does not handle cached executor as Windows does. Executor set to fixed thread pool (cpu core count * 2)

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• Tests are created / updated
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By creating this PR you acknowledge that your contribution will be licensed under Apache 2.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.43%. Comparing base (0bead88) to head (e8f1ac9).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #555   +/-   ##
=========================================
  Coverage     21.42%   21.43%           
  Complexity     1703     1703           
=========================================
  Files           303      303           
  Lines         26379    26382    +3     
  Branches       4204     4204           
=========================================
+ Hits           5653     5656    +3     
  Misses        19787    19787           
  Partials        939      939           

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[c-schuler]

Using a magic number heuristic here. It makes sense in context, but I would prefer a safer approach, like the following:

private static final int threadPoolCount = Integer.getInteger("threadutils.pool.count", Runtime.getRuntime().availableProcessors());

This allows configuration to override e.g. -Dthreadutils.pool.count=8

[echicoine-icf]

Using a magic number heuristic here. It makes sense in context, but I would prefer a safer approach, like the following:

private static final int threadPoolCount = Integer.getInteger("threadutils.pool.count", Runtime.getRuntime().availableProcessors());

This allows configuration to override e.g. -Dthreadutils.pool.count=8

I do like this better. Thank you!