Slight performance overhead can be saved by using Random.nextDouble i…

[bd2019us]

…nstead of Math.random for any instance of Math.random.

Description

Though this is not the only instance of Math.random in the codebase, any instance of it can be replaced by Random.nextDouble. Though not performance critical, this can reduce performance overhead when done across all instances of Math.random.

• Added import for java.util.Random
• Replaced the instance of Math.random with Random.nextDouble

I have a list of every applicable Math.random -> Random.nextDouble instance and will share such list if it is okay to move forward with such modifications.

Motivation and Context

Though not performance critical, this can reduce performance overhead when done across all instances of Math.random.

Types of changes

• Reduced overhead in performance

Checklist:

• [ x ] My code follows the code style of this project.
• [ x ] I have updated the documentation accordingly. (Documentation did need to be updated)

[codecov-io]

Codecov Report

Merging #457 into trunk will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##              trunk     #457      +/-   ##
============================================
+ Coverage     61.19%   61.19%   +<.01%     
- Complexity    11462    11463       +1     
============================================
  Files          1220     1220              
  Lines         77974    77975       +1     
  Branches       7527     7527              
============================================
+ Hits          47717    47719       +2     
+ Misses        27556    27555       -1     
  Partials       2701     2701

Impacted Files	Coverage Δ	Complexity Δ
...s/org/apache/jmeter/timers/PoissonRandomTimer.java	73.68% <100%> (+0.71%)	9 <0> (ø)	⬇️
...c/core/org/apache/jmeter/reporters/Summariser.java	86.25% <0%> (+0.76%)	19% <0%> (+1%)	⬆️

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[FSchumacher]

Thanks for your contribution.
I have used ThreadLocalRandom as it should be even better performing, when multiple threads are using the timer.