Lazy init valid hex array

[baolongnt]

Init of a 64k boolean array take a long time (>30ms P90) during Android app launch.

[linux-foundation-easycla]

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[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.18%. Comparing base (36ca9b8) to head (f5ed4cf).

Files with missing lines	Patch %	Lines
.../opentelemetry/api/internal/OtelEncodingUtils.java	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7809   +/-   ##
=========================================
  Coverage     90.18%   90.18%           
- Complexity     7226     7228    +2     
=========================================
  Files           820      820           
  Lines         21790    21795    +5     
  Branches       2135     2136    +1     
=========================================
+ Hits          19651    19656    +5     
  Misses         1468     1468           
  Partials        671      671           

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[zeitlinger]

reading the volatile is going to make things slower

if we accept that multiple threads initialize the field, we can avoid this, see https://stackoverflow.com/questions/11051863/lazy-initialization-without-synchronization-or-volatile-keyword

[baolongnt]

reading the volatile is going to make things slower

if we accept that multiple threads initialize the field, we can avoid this, see https://stackoverflow.com/questions/11051863/lazy-initialization-without-synchronization-or-volatile-keyword

OK. Let me look into that.

[zeitlinger]

I think you found a good solution that doesn't need locking 😄

[jkwatson]

@baolongnt we can't accept this unless you sign the CLA. Are you able to do so?

[baolongnt]

@baolongnt we can't accept this unless you sign the CLA. Are you able to do so?

Thanks for looking at the PR. I did not think it will get any eyes till I mark as ready. I will have the CLA signed by then.