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Optimize GetOrAdd method in ThreadSafeDictionary for improved concurrency handling #3845
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Claude finished @thomhurst's task —— View job Code Review Analysis ✅Reviewing the ThreadSafeDictionary optimization for improved concurrency handling. Todo List:
📋 Review SummaryThis is an excellent optimization that addresses a critical performance bottleneck in concurrent scenarios. The changes follow TUnit's performance-first philosophy and implement industry best practices for thread-safe caching. ✅ Strengths1. Performance Optimization
2. Concurrency Correctness
3. Code Quality
4. Architecture Alignment
🔍 Technical AnalysisBefore (Issues)var lazy = _innerDictionary.GetOrAdd(key, k => new Lazy<TValue>(() => func(k), ...));
After (Optimized)// Fast path: TryGetValue (lock-free read)
if (_innerDictionary.TryGetValue(key, out var existingLazy))
return existingLazy.Value;
// Slow path: Pre-create Lazy, then GetOrAdd
var newLazy = new Lazy<TValue>(() => func(key), LazyThreadSafetyMode.ExecutionAndPublication);
var winningLazy = _innerDictionary.GetOrAdd(key, newLazy);
return winningLazy.Value;
📊 Expected Performance ImpactFor a heavily-used caching class in TUnit's test execution pipeline:
🚀 Recommendations1. Consider Benchmark Validation ⭐Since this touches a hot path, consider adding a quick benchmark to validate the performance improvement: // Benchmark: Concurrent access to existing keys
// Before: ~X allocations/op, ~Y ns/op
// After: ~0 allocations/op, ~Z ns/op2. Test Coverage ConsiderationsEnsure existing tests cover:
3. Minor Code Style
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fixes #3834