doobidoo/mcp-memory-service v8.60.0

v8.60.0 - Health Check Strategy Pattern Refactoring (Phase 3.1)

on GitHub

Health Check Strategy Pattern Refactoring - Phase 3.1 Complete

This release delivers critical complexity reduction through the implementation of the Strategy Pattern for database health checks, completing Phase 3.1 of our ongoing code quality improvement initiative.

Key Achievements

78% Complexity Reduction

• Reduced handle_check_database_health from complexity E (35) → B (7-8)
• One of the largest single-function complexity reductions in project history

New Architecture - Strategy Pattern

• Created src/mcp_memory_service/utils/health_check.py (262 lines)
• 5 dedicated strategy classes:
  • HealthCheckStrategy (abstract base class)
  • SqliteHealthChecker (complexity 6)
  • CloudflareHealthChecker (complexity 2)
  • HybridHealthChecker (complexity 6)
  • UnknownStorageChecker (complexity 1)
• HealthCheckFactory (complexity 3) for strategy selection

Code Reduction

• server/handlers/utility.py: 356 → 174 lines (-51%, -182 lines)
• handle_check_database_health: 268 → 87 lines (-68%, -181 lines)

Quality Metrics

• 0 security vulnerabilities
• No performance regression
• Each backend strategy independently testable
• Improved maintainability through separation of concerns

Technical Details

Before (Monolithic)

# Massive if/elif chain handling all backends in one function
# Complexity: E (35)
# Lines: 268
# Testability: Difficult - all backends coupled

After (Strategy Pattern)

# Each backend has its own strategy class
# Complexity: B (7-8) per strategy
# Lines: 87 in handler, 262 in strategies
# Testability: Easy - each strategy isolated

Impact

Maintainability

• Backend-specific logic isolated into dedicated classes
• Easier to add new storage backends
• Reduced cognitive load when reading code

Testability

• Each strategy can be tested independently
• Simpler mock setup for unit tests
• Better test coverage possible

Code Organization

• Clear separation of concerns
• Factory pattern for strategy selection
• Follows SOLID principles (Single Responsibility, Open/Closed)

Related Work

This release is part of the Phase 3 - Complexity Reduction initiative:

• Phase 1 (v8.56.0): Server package modularization (4 focused modules)
• Phase 2 (v8.59.0): Handler extraction (29 handlers → 5 specialized files)
• Phase 3.1 (v8.60.0): Health check strategy pattern (this release)
• Phase 3.2+: Additional complexity reduction targets

Full Changelog

See CHANGELOG.md for complete version history.

Upgrade Notes

This release maintains full backward compatibility:

• All existing health check functionality preserved
• No API changes
• No configuration changes required
• Tests continue to pass

Installation

pip install --upgrade mcp-memory-service
# or
uv pip install --upgrade mcp-memory-service

Part of #297 (Phase 3 - Complexity Reduction)

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com