improve product API performance

[tigershi]

https://github.com/vmware/singleton/issues/1757

[codecov[bot]]

Codecov Report

Base: 53.89% // Head: 53.81% // Decreases project coverage by -0.09% :warning:

Coverage data is based on head (2ea6cf0) compared to base (54a0e9e). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1755      +/-   ##
============================================
- Coverage     53.89%   53.81%   -0.09%     
+ Complexity      398      396       -2     
============================================
  Files            69       69              
  Lines          2475     2475              
  Branches        294      294              
============================================
- Hits           1334     1332       -2     
- Misses          973      975       +2     
  Partials        168      168              

Flag	Coverage Δ
vip-manager-i18n	54.42% <ø> (ø)
vip-manager-l10n	50.05% <ø> (ø)
vip-manager-lite-i18n	71.35% <ø> (-0.54%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ava/com/vmware/vip/core/conf/LiteTomcatConfig.java	91.66% <0.00%> (-4.17%)	:arrow_down:
.../vip/core/conf/LiteTomcatConnectionCustomizer.java	35.55% <0.00%> (-2.23%)	:arrow_down:

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[linr211]

where's the document for these changes?