Repository Factory and Manager

Problem/Feature Description

Our multi-repository build system needs to manage hundreds of Git repositories across different projects. The current codebase has scattered repository initialization logic with inconsistent error handling and resource management.

We need a centralized repository factory and manager that provides:

• Consistent repository creation/opening with configurable defaults
• Lifecycle management (opening, caching, closing)
• Connection pooling for frequently accessed repositories
• Statistics tracking (open count, error rates, performance metrics)
• Graceful shutdown of all open repositories
• Support for both bare and non-bare repositories
• Integration with dependency injection frameworks

The factory should follow established design patterns (Factory, Pool, Manager) and provide a clean API for the rest of the application. It should handle edge cases like concurrent access, repository corruption, and disk space issues.

Requirements:

• Singleton or dependency-injected factory instance
• Configurable defaults (auto-close timeout, cache size, retry behavior)
• Metrics collection for monitoring
• Support for both programmatic and declarative configuration
• Pluggable strategies for repository validation and repair
• Integration with application lifecycle (startup/shutdown hooks)

Output Specification

Create a Java class RepositoryManager that implements the following:

1. getRepository(path): Gets or creates repository instance for given path
2. createRepository(path, bare): Creates new repository at path
3. closeRepository(path): Closes repository and removes from cache
4. closeAll(): Closes all managed repositories
5. getStats(): Returns usage statistics
6. shutdown(): Graceful shutdown with timeout

Include supporting classes for configuration, caching, and metrics.

Expected output files:

• RepositoryManager.java - Main factory/manager class
• RepositoryConfig.java - Configuration for repository defaults
• RepositoryPool.java - Pool implementation for repository instances
• RepositoryMetrics.java - Metrics collection class
• RepositoryLifecycle.java - Lifecycle management interface
• build.gradle or pom.xml - Build configuration
• README.md - Documentation on integration and configuration

The solution should demonstrate sophisticated use of design patterns with JGit, proper resource lifecycle management, and production-ready configuration options.