[improve][ml] Optimization method getNumberOfEntries

[hanmz]

Motivation

Currently, when readPosition== lastPosition‘next, getNumberOfEntries will be entered. However, this is meaningless and may affect performance.

For example, readPosition=3:0, lastPosition=3:-1, will enter the getNumberOfEntries method

Modifications

When readPosition is greater than lastPosition, return 0 directly.

Documentation

• [ ] doc
• [ ] doc-required
• [x] doc-not-needed
• [ ] doc-complete

[nodece]

/pulsarbot rerun-failure-checks

[hanmz]

/pulsarbot rerun-failure-checks

[nodece]

/pulsarbot rerun-failure-checks

[Jason918]

close & reopen to trigger CI

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.49%. Comparing base (bbc6224) to head (815e3b5). Report is 794 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23576      +/-   ##
============================================
+ Coverage     73.57%   75.49%   +1.91%     
- Complexity    32624    37348    +4724     
============================================
  Files          1877     1946      +69     
  Lines        139502   155026   +15524     
  Branches      15299    17834    +2535     
============================================
+ Hits         102638   117030   +14392     
- Misses        28908    29383     +475     
- Partials       7956     8613     +657     

Flag	Coverage Δ
inttests	27.35% <100.00%> (+2.76%)	:arrow_up:
systests	24.38% <100.00%> (+0.05%)	:arrow_up:
unittests	74.92% <100.00%> (+2.08%)	:arrow_up:

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

Files with missing lines	Coverage Δ
...che/bookkeeper/mledger/impl/ManagedCursorImpl.java	82.08% <100.00%> (+2.78%)	:arrow_up:

... and 673 files with indirect coverage changes

[nodece]

@hanmz Please rebase master branch.

[hanmz]

reopen to trigger CI

[hanmz]

@hanmz Please rebase master branch.

Done, please help me review again