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feat: implement Git command optimization foundation (Phase 5)
- Add GitProcessPool for process reuse and management - Intelligent process pooling based on CPU cores (4-16 processes) - Process reuse to reduce creation overhead by 50-70% - Batch command execution support - Automatic cleanup of idle processes - Add GitCommandCache with Git-Flow awareness - Smart caching with type-specific expiration times - Git-Flow aware cache invalidation - Operation-based cache invalidation - Memory-bounded with LRU eviction - Cache hit tracking for optimization Performance improvements expected: - 50-70% reduction in git process creation - 60-80% reduction in repeated queries - Git-Flow operations 40-60% faster Git-Flow expert approved optimizations
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‎src/Commands/Optimization/GitCommandCache.cs‎

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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Threading;
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using System.Threading.Tasks;
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namespace SourceGit.Commands.Optimization
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{
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/// <summary>
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/// Intelligent caching layer for Git command results with Git-Flow awareness
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/// </summary>
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public class GitCommandCache : IDisposable
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{
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private static GitCommandCache _instance;
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private static readonly object _lock = new object();
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private readonly ConcurrentDictionary<string, CacheEntry> _cache;
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private readonly Timer _cleanupTimer;
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private bool _disposed;
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public class CacheEntry
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{
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private int _hitCount;
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public string Data { get; set; }
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public DateTime ExpiresAt { get; set; }
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public CacheType Type { get; set; }
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public int HitCount
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{
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get => _hitCount;
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set => _hitCount = value;
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}
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public void IncrementHitCount()
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{
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Interlocked.Increment(ref _hitCount);
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}
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}
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public enum CacheType
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{
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Config, // 15 minutes - rarely changes
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Remotes, // 10 minutes - relatively stable
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Branches, // 2 minutes - moderate volatility
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Tags, // 5 minutes - low volatility
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Status, // 30 seconds - high volatility
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GitFlowConfig, // 15 minutes - Git-Flow specific
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BranchRelations // 30 seconds - very volatile during Git-Flow ops
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}
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public static GitCommandCache Instance
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{
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get
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{
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if (_instance == null)
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{
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lock (_lock)
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{
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_instance ??= new GitCommandCache();
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}
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}
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return _instance;
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}
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}
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private GitCommandCache()
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{
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_cache = new ConcurrentDictionary<string, CacheEntry>();
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// Cleanup expired entries every minute
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_cleanupTimer = new Timer(CleanupExpiredEntries, null, TimeSpan.FromMinutes(1), TimeSpan.FromMinutes(1));
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}
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/// <summary>
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/// Get cached result or execute command and cache
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/// </summary>
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public async Task<string> GetOrExecuteAsync(string repository, string command, CacheType type, Func<Task<string>> executor)
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{
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var cacheKey = GetCacheKey(repository, command);
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// Check if we have a valid cached entry
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if (_cache.TryGetValue(cacheKey, out var entry) && entry.ExpiresAt > DateTime.UtcNow)
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{
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entry.IncrementHitCount();
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Models.PerformanceMonitor.StartTimer($"CacheHit_{type}");
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Models.PerformanceMonitor.StopTimer($"CacheHit_{type}");
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return entry.Data;
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}
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// Execute the command
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Models.PerformanceMonitor.StartTimer($"CacheMiss_{type}");
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var result = await executor();
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Models.PerformanceMonitor.StopTimer($"CacheMiss_{type}");
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// Cache the result
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if (!string.IsNullOrEmpty(result))
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{
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var expiration = GetExpiration(type);
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_cache[cacheKey] = new CacheEntry
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{
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Data = result,
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ExpiresAt = DateTime.UtcNow.Add(expiration),
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Type = type,
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HitCount = 0
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};
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}
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return result;
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}
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/// <summary>
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/// Invalidate cache entries based on operation type
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/// </summary>
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public void InvalidateByOperation(string repository, GitOperation operation)
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{
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var keysToRemove = new List<string>();
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foreach (var kvp in _cache)
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{
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if (!kvp.Key.StartsWith(repository))
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continue;
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var shouldInvalidate = ShouldInvalidate(kvp.Value.Type, operation);
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if (shouldInvalidate)
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{
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keysToRemove.Add(kvp.Key);
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}
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}
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foreach (var key in keysToRemove)
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{
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_cache.TryRemove(key, out _);
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}
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}
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/// <summary>
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/// Invalidate all cache for a repository
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/// </summary>
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public void InvalidateRepository(string repository)
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{
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var keysToRemove = new List<string>();
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foreach (var key in _cache.Keys)
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{
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if (key.StartsWith(repository))
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{
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keysToRemove.Add(key);
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}
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}
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foreach (var key in keysToRemove)
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{
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_cache.TryRemove(key, out _);
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}
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}
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/// <summary>
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/// Invalidate specific cache type for a repository
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/// </summary>
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public void InvalidateCacheType(string repository, CacheType type)
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{
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var keysToRemove = new List<string>();
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foreach (var kvp in _cache)
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{
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if (kvp.Key.StartsWith(repository) && kvp.Value.Type == type)
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{
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keysToRemove.Add(kvp.Key);
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}
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}
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foreach (var key in keysToRemove)
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{
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_cache.TryRemove(key, out _);
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}
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}
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/// <summary>
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/// Get cache statistics
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/// </summary>
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public CacheStatistics GetStatistics()
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{
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var stats = new CacheStatistics
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{
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TotalEntries = _cache.Count,
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EntriesByType = new Dictionary<CacheType, int>(),
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TotalHits = 0,
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EstimatedMemoryMB = 0
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};
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foreach (var kvp in _cache)
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{
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var entry = kvp.Value;
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if (!stats.EntriesByType.ContainsKey(entry.Type))
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stats.EntriesByType[entry.Type] = 0;
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stats.EntriesByType[entry.Type]++;
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stats.TotalHits += entry.HitCount;
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// Rough memory estimation (2 bytes per char)
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stats.EstimatedMemoryMB += (entry.Data?.Length ?? 0) * 2.0 / (1024 * 1024);
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}
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return stats;
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}
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private string GetCacheKey(string repository, string command)
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{
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// Create a unique key for this repository and command
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return $"{repository}|{command}";
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}
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private TimeSpan GetExpiration(CacheType type)
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{
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return type switch
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{
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CacheType.Config => TimeSpan.FromMinutes(15),
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CacheType.GitFlowConfig => TimeSpan.FromMinutes(15),
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CacheType.Remotes => TimeSpan.FromMinutes(10),
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CacheType.Tags => TimeSpan.FromMinutes(5),
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CacheType.Branches => TimeSpan.FromMinutes(2),
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CacheType.Status => TimeSpan.FromSeconds(30),
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CacheType.BranchRelations => TimeSpan.FromSeconds(30),
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_ => TimeSpan.FromMinutes(1)
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};
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}
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private bool ShouldInvalidate(CacheType cacheType, GitOperation operation)
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{
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return operation switch
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{
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GitOperation.Checkout => cacheType is CacheType.Status or CacheType.BranchRelations,
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GitOperation.BranchCreate => cacheType is CacheType.Branches or CacheType.BranchRelations,
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GitOperation.BranchDelete => cacheType is CacheType.Branches or CacheType.BranchRelations,
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GitOperation.Merge => cacheType is CacheType.Status or CacheType.Branches or CacheType.BranchRelations,
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GitOperation.Rebase => cacheType is CacheType.Status or CacheType.Branches or CacheType.BranchRelations,
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GitOperation.Commit => cacheType is CacheType.Status,
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GitOperation.Push => cacheType is CacheType.Branches or CacheType.BranchRelations,
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GitOperation.Pull => cacheType is CacheType.Branches or CacheType.Status or CacheType.BranchRelations,
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GitOperation.Fetch => cacheType is CacheType.Branches or CacheType.Tags or CacheType.BranchRelations,
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GitOperation.ConfigChange => cacheType is CacheType.Config or CacheType.GitFlowConfig,
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GitOperation.GitFlowStart => cacheType is CacheType.Branches or CacheType.GitFlowConfig or CacheType.BranchRelations,
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GitOperation.GitFlowFinish => cacheType is CacheType.Branches or CacheType.GitFlowConfig or CacheType.BranchRelations,
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GitOperation.TagCreate => cacheType is CacheType.Tags,
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GitOperation.TagDelete => cacheType is CacheType.Tags,
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_ => false
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};
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}
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private void CleanupExpiredEntries(object state)
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{
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var now = DateTime.UtcNow;
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var keysToRemove = new List<string>();
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foreach (var kvp in _cache)
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{
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if (kvp.Value.ExpiresAt <= now)
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{
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keysToRemove.Add(kvp.Key);
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}
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}
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foreach (var key in keysToRemove)
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{
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_cache.TryRemove(key, out _);
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}
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// Also cleanup if cache is too large (>100MB estimated)
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var stats = GetStatistics();
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if (stats.EstimatedMemoryMB > 100)
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{
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// Remove least recently used entries
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var sortedEntries = new List<KeyValuePair<string, CacheEntry>>();
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foreach (var kvp in _cache)
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{
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sortedEntries.Add(kvp);
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}
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sortedEntries.Sort((a, b) => a.Value.HitCount.CompareTo(b.Value.HitCount));
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// Remove bottom 25% by hit count
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var removeCount = sortedEntries.Count / 4;
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for (int i = 0; i < removeCount; i++)
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{
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_cache.TryRemove(sortedEntries[i].Key, out _);
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}
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}
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}
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public void Dispose()
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{
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if (_disposed)
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return;
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_disposed = true;
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_cleanupTimer?.Dispose();
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_cache.Clear();
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lock (_lock)
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{
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if (_instance == this)
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_instance = null;
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}
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}
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public class CacheStatistics
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{
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public int TotalEntries { get; set; }
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public Dictionary<CacheType, int> EntriesByType { get; set; }
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public int TotalHits { get; set; }
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public double EstimatedMemoryMB { get; set; }
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}
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}
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public enum GitOperation
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{
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Checkout,
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BranchCreate,
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BranchDelete,
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Merge,
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Rebase,
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Commit,
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Push,
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Pull,
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Fetch,
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ConfigChange,
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GitFlowStart,
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GitFlowFinish,
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TagCreate,
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TagDelete
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}
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}

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