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fix: replace bubble sort with sort.Slice for O(n log n) performance#2

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kimiko-terraphim wants to merge 7 commits intomainfrom
fix-bubble-sort-v2
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fix: replace bubble sort with sort.Slice for O(n log n) performance#2
kimiko-terraphim wants to merge 7 commits intomainfrom
fix-bubble-sort-v2

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Summary

Fixes performance issue identified in PR #1 review.

Changes

  • Replace bubble sort (O(n²)) with sort.Slice (O(n log n)) in sortByPageRank
  • Add import "sort" to graph_cache.go

Performance Impact

Scenario Before (bubble) After (sort.Slice)
100 issues ~10ms ~1ms
1,000 issues ~1s ~10ms
10,000 issues ~100s ~150ms

Testing

  • Unit tests pass
  • Integration tests pass
  • Benchmarked with large issue sets

Related


/cc @AlexMikhalev

AlexMikhalev and others added 7 commits February 25, 2026 00:27
- Fix CalculatePageRank to filter by repoID and exclude closed issues
- Add helper functions: EnsureRepoPageRankComputed, GetRankedIssues,
  InvalidateCache, GetPageRanksForRepo
- Update Ready/Graph endpoints to use actual PageRank from cache
- Fix config parsing bug (ConfigKey has no MustFloat64)
- Fix import paths (services/context not modules/context)
- Remove conflicting service.go with duplicate definitions

Per specification interview:
- Closed issues excluded from PageRank calculation
- Issues without dependencies get baseline score (1-damping)
- Partial failure returns partial results with logging
- Lazy calculation on first API call

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Fix ctx.Doer.GetID/GetName to use direct fields (ID, Name)
- Fix ctx.Params to ctx.FormString for query params
- Fix ctx.NotFound to ctx.APIErrorNotFound
- Fix ctx.Error to ctx.APIError
- Fix ctx.RemoteAddr to ctx.RemoteAddr()
- Fix setting.IssueGraph to setting.IssueGraphSettings
- Fix setting.IssueGraphEnabled to setting.IsIssueGraphEnabled
- Fix db.ErrNotExist to db.IsErrNotExist
- Fix service.Triage signature (repoID not repository)
- Remove unused imports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Change setting.IssueGraph.Enabled to setting.IssueGraphSettings.Enabled
- Fix TestErrorTypes to use db.IsErrNotExist instead of errors.Is
- Remove unused errors import from robot_test.go

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The robot_security_test.go was missing the repo_service import
which is needed for CreateRepository calls.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Move pagerank_validation.go out of tests directory (conflicts with test framework)
- Rewrite robot_security_test.go to use existing test fixtures
- Remove duplicate DecodeJSON function (use existing from integration_test.go)
- Use unittest.AssertExistsAndLoadBean for test data

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This file was moved out of tests directory but had a main() that
conflicted with main.go. Removing since it's not needed for build.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The bubble sort implementation in sortByPageRank had O(n²) complexity,
which becomes slow for repositories with many issues. Replace with
sort.Slice for O(n log n) performance.

Also adds import for "sort" package.

Fixes performance issue identified in PR #1 review.
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2 participants