feat: 15448: In-memory virtual maps support

[artemananiev]

Fix summary:

• In-memory virtual maps support is implemented

Fixes: #15448
Signed-off-by: Artem Ananev [email protected]

[codecov]

Codecov Report

Attention: Patch coverage is 75.71429% with 34 lines in your changes missing coverage. Please review.

Project coverage is 63.35%. Comparing base (bea1d1f) to head (e5db1ad).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ds/virtualmap/internal/cache/VirtualNodeCache.java	69.23%	13 Missing and 19 partials ⚠️
.../virtualmap/internal/pipeline/VirtualPipeline.java	81.81%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #15575      +/-   ##
=============================================
+ Coverage      63.31%   63.35%   +0.03%     
- Complexity     20136    20174      +38     
=============================================
  Files           2531     2536       +5     
  Lines          94018    94122     +104     
  Branches        9834     9849      +15     
=============================================
+ Hits           59528    59631     +103     
+ Misses         30901    30892       -9     
- Partials        3589     3599      +10     

Files with missing lines	Coverage Δ
...lds/virtualmap/internal/cache/ConcurrentArray.java	74.56% <100.00%> (+3.65%)	⬆️
...rtualmap/internal/merkle/VirtualMapStatistics.java	59.42% <ø> (-0.04%)	⬇️
...ds/virtualmap/internal/merkle/VirtualRootNode.java	57.77% <100.00%> (+0.32%)	⬆️
...rlds/virtualmap/internal/pipeline/VirtualRoot.java	0.00% <ø> (ø)
.../virtualmap/internal/pipeline/VirtualPipeline.java	60.90% <81.81%> (+3.41%)	⬆️
...ds/virtualmap/internal/cache/VirtualNodeCache.java	69.39% <69.23%> (+1.68%)	⬆️

... and 25 files with indirect coverage changes

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.04% (target: -1.00%)	✅ 89.29%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bea1d1f)	96837	62979	65.04%
Head commit (e5db1ad)	96889 (+52)	63048 (+69)	65.07% (+0.04%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#15575)	140	125	89.29%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[anthony-swirldslabs]

Overall the fix looks good. However, I have a very shallow understanding of the implementation details. So it would be good to get another pair of eyes to take a look here.

Just posting a few comments/questions, mostly to clarify things.