⚡ Bolt: Optimize cascadeFailure to O(N)

[thalesraymond]

💡 What: Replaced queue.shift() with an index pointer in TaskStateManager.cascadeFailure.
🎯 Why: Array.prototype.shift() is O(N), making the BFS traversal O(N^2) in the worst case (fan-out). This was a bottleneck for large graphs.
📊 Impact: Reduced execution time for 50,000 fan-out tasks from ~286ms to ~67ms (~4.2x speedup).
🔬 Measurement: Verified with a temporary benchmark tests/bench_cascade_failure.test.ts (deleted before submission). All existing tests pass.

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PR created automatically by Jules for task 7087586738119827479 started by @thalesraymond

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[gemini-code-assist]

Summary of Changes

Hello @thalesraymond, 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 significantly enhances the performance of the TaskStateManager by optimizing the cascadeFailure method. By switching from an inefficient Array.prototype.shift() operation to an index-based traversal for its internal queue, the change eliminates a major bottleneck when processing large dependency graphs, resulting in a much faster and more scalable failure cascading mechanism.

Highlights

• Performance Optimization: Replaced the Array.prototype.shift() method with an index pointer (head) for queue processing within the cascadeFailure method in TaskStateManager.ts.
• Algorithmic Complexity Improvement: This change reduces the time complexity of the Breadth-First Search (BFS) traversal in cascadeFailure from O(N^2) to O(N) in worst-case scenarios, particularly for large fan-out graphs.
• Significant Speedup: Benchmarks show a substantial performance improvement, with execution time for 50,000 fan-out tasks decreasing from approximately 286ms to 67ms, representing a 4.2x speedup.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gemini-code-assist]

Code Review

This pull request introduces a valuable performance optimization to the cascadeFailure method within TaskStateManager. By replacing the O(N) Array.prototype.shift() operation with an O(1) index-based approach to simulate a queue, the overall complexity for cascading failures is correctly reduced from O(N^2) to O(N). This is a significant improvement for scenarios with large, fan-out dependency graphs, as demonstrated by the provided metrics. The implementation is clean, correct, and a standard pattern for efficient breadth-first traversal in JavaScript. Additionally, this change has the positive side effect of removing a non-null assertion, which improves type safety. The change is excellent and ready to be merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!