修改了可写FileDataSource

[yfh0918]

Describe what this PR does / why we need it

See #75

Does this pull request fix one issue?

Describe how you did it

Describe how to verify it

Special notes for reviews

[sczyh30]

Please reformat your code with Alibaba P3C Plugin and obey the rules in Alibaba Java Coding Guidelines (naming, indent, format, etc.).

[codecov-io]

Codecov Report

Merging #125 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #125      +/-   ##
============================================
+ Coverage     45.67%   45.83%   +0.15%     
- Complexity      554      556       +2     
============================================
  Files           114      114              
  Lines          3814     3814              
  Branches        531      531              
============================================
+ Hits           1742     1748       +6     
+ Misses         1859     1855       -4     
+ Partials        213      211       -2

Impacted Files	Coverage Δ	Complexity Δ
...a/csp/sentinel/slots/statistic/base/LeapArray.java	76.92% <0%> (+5.12%)	15% <0%> (+1%)	⬆️
...ibaba/csp/sentinel/eagleeye/EagleEyeLogDaemon.java	30.3% <0%> (+6.06%)	6% <0%> (+1%)	⬆️

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[sczyh30]

Thanks for your contribution!