utils: add wrapper for the loading cache

[shwstppr]

Description

Follow up for #9628
Creates a utility class LazyCache which currently wraps Caffeine library Cache class.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[shwstppr]

@blueorangutan package

[blueorangutan]

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 15.58%. Comparing base (2245d98) to head (e6f1090).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...a/org/apache/cloudstack/utils/cache/LazyCache.java	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##               main    #9638     +/-   ##
===========================================
  Coverage     15.57%   15.58%             
- Complexity    12056    12060      +4     
===========================================
  Files          5506     5507      +1     
  Lines        482919   482932     +13     
  Branches      61184    62859   +1675     
===========================================
+ Hits          75233    75245     +12     
  Misses       399375   399375             
- Partials       8311     8312      +1     

Flag	Coverage Δ
uitests	4.17% <ø> (ø)
unittests	16.36% <94.44%> (+<0.01%)	⬆️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 10982

[rohityadavcloud]

minor nit - CacheUtils ?

[shwstppr]

intentionally didn't use *Utils as we are/will be creating objects of this class unlike other static Utils classes. Any other suggestions maybe?

[DaanHoogland]

How about org.apache.cloudstack.utils.Cache, @shwstppr ?

[DaanHoogland]

clgtm

[rohityadavcloud]

@blueorangutan test

[blueorangutan]

@rohityadavcloud a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[rohityadavcloud]

@DaanHoogland @JoaoJandre do we need manual testing or is the smoketests good enough? Looks like just refactoring to me.

@blueorangutan test

[blueorangutan]

@rohityadavcloud a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian test result (tid-11458)
Environment: kvm-ol8 (x2), Advanced Networking with Mgmt server ol8
Total time taken: 51399 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr9638-t11458-kvm-ol8.zip
Smoke tests completed. 138 look OK, 1 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File
test_01_secure_vm_migration	Error	400.00	test_vm_life_cycle.py

[JoaoJandre]

@shwstppr @rohityadavcloud why is this needed for 4.20? It seems like it could go in 4.20.1

[shwstppr]

@JoaoJandre It is just refactoring and good to have. I'm okay if you want to move it to 4.20.1.