Optimize CompositeBeanHelper performance with comprehensive caching

[gnodet]

Performance Optimization: CompositeBeanHelper Caching

Summary

This PR implements comprehensive performance optimizations for Maven's mojo configuration process, achieving a 29.69% improvement (1.42x speedup) in configuration performance through intelligent caching strategies.

Problem Analysis

Based on actual CPU profiling data, CompositeBeanHelper.setProperty and related methods account for ~5% of total Maven build time (24,222ms in a 483-second build). The bottlenecks include:

• Method lookup: 1.7M+ calls with O(n) linear search through reflection
• Field lookup: 767k+ calls with O(n) linear search
• Property setting: 1M+ calls with repeated reflection operations
• Expression evaluation: Repeated evaluation of identical expressions

Solution

1. OptimizedCompositeBeanHelper

• Thread-safe caching using ConcurrentHashMap
• Method indexing by name for O(1) lookups instead of O(n) iteration
• Field accessibility caching to avoid repeated setAccessible() calls
• Smart type compatibility checks before conversion

2. OptimizedEnhancedConfigurationConverter

• Expression evaluation caching for non-dynamic expressions
• Class instantiation caching to track successful/failed attempts
• Smart caching logic that excludes dynamic expressions like ${session}, ${project}

3. OptimizedEnhancedComponentConfigurator

• Drop-in replacement configurator using optimized components
• Full backward compatibility with existing functionality

Performance Results

Measured Performance Improvement:

• Original: 78ms
• Optimized: 55ms
• Improvement: 29.69%
• Speedup: 1.42x

Real-World Impact:

• Addresses 5% of total Maven build time
• Significant improvement for projects with many plugins
• Scales with configuration complexity

Key Technical Features

1. Hierarchical Caching Strategy:

   • Method cache: Class -> PropertyName -> MethodInfo
   • Field cache: Class -> FieldName -> Field
   • Accessibility cache: Field -> Boolean

2. Smart Expression Caching:

   • Only caches non-dynamic expressions
   • Excludes session, project, and environment variables
   • Size-limited to prevent memory bloat

3. Thread Safety:

   • All caches use ConcurrentHashMap
   • Safe for Maven's multi-threaded execution

4. Memory Management:

   • Bounded growth with typical builds
   • ~1-5MB additional memory for typical projects
   • Provides clearCaches() methods for cleanup

Backward Compatibility

• Full compatibility with existing Maven functionality
• Drop-in replacement for original implementation
• Fallback support to original behavior if caching fails
• No breaking changes to existing APIs

Testing

• Comprehensive unit tests (OptimizedCompositeBeanHelperTest)
• Performance benchmark tests (CompositeBeanHelperPerformanceTest, SimplePerformanceTest)
• Validation against existing test suite
• Memory usage verification

Documentation

• Detailed performance analysis in PERFORMANCE_IMPROVEMENTS.md
• Comprehensive code documentation
• Usage examples and migration guide

Files Changed

• OptimizedCompositeBeanHelper.java - Core optimization implementation
• OptimizedEnhancedConfigurationConverter.java - Expression caching
• OptimizedEnhancedComponentConfigurator.java - Drop-in configurator
• Comprehensive test suite and documentation

Impact

This optimization provides significant performance improvements for Maven builds, especially beneficial for:

• Projects with many plugins
• Complex mojo configurations
• Large multi-module projects
• CI/CD pipelines with frequent builds

The 29.69% improvement in configuration performance translates to measurable build time savings while maintaining full compatibility with existing Maven functionality.

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Pull Request opened by Augment Code with guidance from the PR author