Optimze away WindmillWatermarkHold::clear when the cached hold is empty

[arunpandianp]

No description provided.

[arunpandianp]

R: @scwhittle

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a performance optimization for the WindmillWatermarkHold class by preventing redundant operations when the watermark hold is already cleared. By adding an early return check, the system avoids unnecessary processing and state modifications, improving efficiency in scenarios where clear() is called on an empty state.

Highlights

• Performance Optimization: Added a conditional check in WindmillWatermarkHold::clear to return early if the cached hold is already empty, avoiding unnecessary state updates.
• Testing: Added a new test case testWatermarkClearNoOp to verify that clearing an empty watermark hold does not result in unnecessary state persistence.

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[github-actions]

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[arunpandianp]

StreamingDataflowWorkerTest tests fail due to problems with mocks, looking into fixing them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.60%. Comparing base (e01f711) to head (0fd40f5).
⚠️ Report is 79 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #38297      +/-   ##
============================================
- Coverage     57.23%   55.60%   -1.64%     
+ Complexity     5120     2095    -3025     
============================================
  Files          1396     1102     -294     
  Lines        197997   172400   -25597     
  Branches       4826     1349    -3477     
============================================
- Hits         113326    95859   -17467     
+ Misses        80835    74161    -6674     
+ Partials       3836     2380    -1456     

Flag	Coverage Δ
java	75.90% <ø> (+5.02%)	⬆️

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