Duansg commented on PR #948:
URL: https://github.com/apache/fesod/pull/948#issuecomment-4982986684

   @psxjoy thanks for your suggestion, i have supplemented and revised the 
related issues
   
   Caching
   
   - Modify the cache to be a nested `Map<Locale, Map<String, Formatter>>`: 
where `locale` serves as the outer key and `pattern` as the inner key—thereby 
avoiding the need to assign a composite string key consisting of `locale` and 
`pattern` to each cell.
   - Both levels use bounded FIFO eviction so long-lived threads can't grow the 
cache without bound.
   
   Tests
   
   - Added @ResourceLock(Resources.LOCALE) to tests that mutate the global 
default locale, preventing races with other locale-sensitive tests under 
parallel execution.
   
   Performance (local benchmark, 3 runs)
   
   ```markdown
   
┌──────────────┬─────────────┬────────────┬────────┬──────────────┬─────────────┬─────────┐
   │  Benchmark   │ Time before │ Time after │ Time Δ │ Alloc before │ Alloc 
after │ Alloc Δ │
   
├──────────────┼─────────────┼────────────┼────────┼──────────────┼─────────────┼─────────┤
   │ dateFormat   │ 223.5 ns    │ 99.8 ns    │ −55%   │ 760 B        │ 160 B    
   │ −79%    │
   
├──────────────┼─────────────┼────────────┼────────┼──────────────┼─────────────┼─────────┤
   │ dateParse    │ 379.0 ns    │ 251.9 ns   │ −34%   │ 1256 B       │ 656 B    
   │ −48%    │
   
├──────────────┼─────────────┼────────────┼────────┼──────────────┼─────────────┼─────────┤
   │ numberFormat │ 594.2 ns    │ 265.5 ns   │ −55%   │ 1781 B       │ 216 B    
   │ −88%    │
   
├──────────────┼─────────────┼────────────┼────────┼──────────────┼─────────────┼─────────┤
   │ numberParse  │ 301.7 ns    │ 123.9 ns   │ −59%   │ 1717 B       │ 248 B    
   │ −86%    │
   
└──────────────┴─────────────┴────────────┴────────┴──────────────┴─────────────┴─────────┘
   ```


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