module-registry 0.1.0

# User Guide - Module Registry

## Overview

This comprehensive user guide provides detailed instructions for using the Module Registry module effectively.

## Getting Started

### Installation

```bash
# Add to Cargo.toml
[dependencies]
module-registry = "0.1.0"

# Or install via cargo
cargo add module-registry
```

### Basic Usage

```rust
use module_registry::{ModuleRegistry, ModuleConfig, ModuleType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    let config = ModuleConfig::new()
        .with_name("data-processor")
        .with_version("1.0.0")
        .with_type(ModuleType::DataProcessor);
    
    registry.register(config)?;
    
    let instance = registry.create("data-processor")?;
    let result = instance.process(b"input data")?;
    
    println!("Processed data: {:?}", result);
    
    Ok(())
}
```

## Module Registration

### Basic Module Registration

```rust
use module_registry::{ModuleRegistry, ModuleConfig, ModuleType};

let registry = ModuleRegistry::new();

// Register a simple module
let config = ModuleConfig::new()
    .with_name("data-processor")
    .with_version("1.0.0")
    .with_type(ModuleType::DataProcessor)
    .add_capability("processing");

registry.register(config)?;
```

### Advanced Module Registration

```rust
use module_registry::{ModuleRegistry, ModuleConfig, ModuleType};

let registry = ModuleRegistry::new();

// Register a module with dependencies and metadata
let config = ModuleConfig::new()
    .with_name("advanced-processor")
    .with_version("2.0.0")
    .with_type(ModuleType::DataProcessor)
    .add_dependency("base-processor")
    .add_dependency("validation-module")
    .add_capability("high-performance")
    .add_capability("encryption")
    .with_metadata("author", "John Doe")
    .with_metadata("license", "MIT")
    .with_metadata("description", "Advanced data processor");

registry.register(config)?;
```

### Conditional Module Registration

```rust
use module_registry::{ModuleRegistry, ConditionalRegistration};

let registry = ModuleRegistry::new()
    .with_conditional_registration(true);

// Register a module conditionally
let conditional_config = ConditionalRegistration::new()
    .with_environment_condition("production")
    .with_capability_condition("high-performance")
    .with_dependency_condition("database-module");

registry.register_conditional(conditional_config)?;
```

## Module Discovery

### Basic Module Discovery

```rust
use module_registry::{ModuleRegistry, DiscoveryQuery, ModuleType};

let registry = ModuleRegistry::new();

// Discover modules by name pattern
let query = DiscoveryQuery::new()
    .with_name_pattern("processor")
    .with_type_filter(ModuleType::DataProcessor);

let modules = registry.discover(query)?;
```

### Capability-Based Discovery

```rust
use module_registry::{ModuleRegistry, CapabilityQuery};

let registry = ModuleRegistry::new();

// Discover modules by capabilities
let query = CapabilityQuery::new()
    .with_required_capabilities(vec!["encryption", "compression"])
    .with_optional_capabilities(vec!["monitoring", "logging"]);

let modules = registry.discover_capabilities(query)?;
```

### Semantic Discovery

```rust
use module_registry::{ModuleRegistry, SemanticQuery};

let registry = ModuleRegistry::new();

// Discover modules semantically
let query = SemanticQuery::new()
    .with_intent("data processing")
    .with_context("high volume")
    .with_requirements(vec!["performance", "scalability"]);

let modules = registry.discover_semantic(query)?;
```

## Module Instantiation

### Basic Module Instantiation

```rust
use module_registry::{ModuleRegistry, InstantiationConfig};

let registry = ModuleRegistry::new();

// Create a module instance
let instance = registry.create("data-processor")?;

// Use the module
let data = b"input data";
let result = instance.process(data)?;
```

### Advanced Module Instantiation

```rust
use module_registry::{ModuleRegistry, AdvancedInstantiationConfig};

let registry = ModuleRegistry::new();

// Create a module instance with advanced configuration
let config = AdvancedInstantiationConfig::new()
    .with_initialization(true)
    .with_validation(true)
    .with_monitoring(true);

let instance = registry.create_advanced("data-processor", config)?;
```

### Lazy Module Instantiation

```rust
use module_registry::{ModuleRegistry, LazyInstantiation};

let registry = ModuleRegistry::new()
    .with_lazy_instantiation(true);

// Create a lazy module instance
let lazy_module = registry.create_lazy("data-processor")?;

// Module is only instantiated when first used
let result = lazy_module.process(b"input data")?;
```

## Configuration

### Basic Configuration

```rust
use module_registry::{ModuleRegistry, Configuration};

let registry = ModuleRegistry::new();

// Configure the registry
let config = Configuration::new()
    .with_caching(true)
    .with_monitoring(true)
    .with_logging(true);

registry.configure(config)?;
```

### Advanced Configuration

```rust
use module_registry::{ModuleRegistry, AdvancedConfiguration};

let registry = ModuleRegistry::new();

// Configure the registry with advanced settings
let config = AdvancedConfiguration::new()
    .with_caching_strategy("LRU")
    .with_cache_size(1000)
    .with_monitoring_level("detailed")
    .with_logging_level("debug")
    .with_security_hardening(true);

registry.configure_advanced(config)?;
```

### Environment-Specific Configuration

```rust
use module_registry::{ModuleRegistry, EnvironmentConfiguration};

let registry = ModuleRegistry::new();

// Configure for different environments
let dev_config = EnvironmentConfiguration::new()
    .with_environment("development")
    .with_debug_mode(true)
    .with_verbose_logging(true);

let prod_config = EnvironmentConfiguration::new()
    .with_environment("production")
    .with_debug_mode(false)
    .with_verbose_logging(false);

registry.configure_environment("development", dev_config)?;
registry.configure_environment("production", prod_config)?;
```

## Performance Configuration

### Caching Configuration

```rust
use module_registry::{ModuleRegistry, CachingConfig};

let registry = ModuleRegistry::new()
    .with_caching(true);

// Configure caching
let cache_config = CachingConfig::new()
    .with_cache_type("LRU")
    .with_cache_size(1000)
    .with_cache_ttl(3600)
    .with_cache_compression(true);

registry.configure_caching(cache_config)?;
```

### Performance Optimization

```rust
use module_registry::{ModuleRegistry, PerformanceOptimizationConfig};

let registry = ModuleRegistry::new()
    .with_performance_optimization(true);

// Configure performance optimization
let optimization_config = PerformanceOptimizationConfig::new()
    .with_algorithm_optimization(true)
    .with_data_structure_optimization(true)
    .with_memory_optimization(true)
    .with_cpu_optimization(true);

registry.configure_performance_optimization(optimization_config)?;
```

### Resource Management

```rust
use module_registry::{ModuleRegistry, ResourceManagementConfig};

let registry = ModuleRegistry::new()
    .with_resource_management(true);

// Configure resource management
let resource_config = ResourceManagementConfig::new()
    .with_memory_limit(1024 * 1024 * 1024) // 1GB
    .with_cpu_limit(80) // 80%
    .with_io_limit(1000) // 1000 IOPS
    .with_network_limit(100 * 1024 * 1024); // 100MB/s

registry.configure_resource_management(resource_config)?;
```

## Security Configuration

### Basic Security

```rust
use module_registry::{ModuleRegistry, SecurityConfig};

let registry = ModuleRegistry::new()
    .with_security(true);

// Configure basic security
let security_config = SecurityConfig::new()
    .with_secure_registration(true)
    .with_secure_instantiation(true)
    .with_access_control(true);

registry.configure_security(security_config)?;
```

### Advanced Security

```rust
use module_registry::{ModuleRegistry, AdvancedSecurityConfig};

let registry = ModuleRegistry::new()
    .with_advanced_security(true);

// Configure advanced security
let security_config = AdvancedSecurityConfig::new()
    .with_secure_registration(true)
    .with_secure_instantiation(true)
    .with_secure_communication(true)
    .with_secure_storage(true)
    .with_access_control(true)
    .with_role_based_access(true)
    .with_audit_logging(true);

registry.configure_advanced_security(security_config)?;
```

### Access Control

```rust
use module_registry::{ModuleRegistry, AccessControlConfig};

let registry = ModuleRegistry::new()
    .with_access_control(true);

// Configure access control
let access_config = AccessControlConfig::new()
    .with_role_based_access(true)
    .with_permission_validation(true)
    .with_access_logging(true)
    .with_access_monitoring(true);

registry.configure_access_control(access_config)?;
```

## Monitoring Configuration

### Basic Monitoring

```rust
use module_registry::{ModuleRegistry, MonitoringConfig};

let registry = ModuleRegistry::new()
    .with_monitoring(true);

// Configure basic monitoring
let monitoring_config = MonitoringConfig::new()
    .with_metrics_collection(true)
    .with_logging(true)
    .with_alerting(true);

registry.configure_monitoring(monitoring_config)?;
```

### Advanced Monitoring

```rust
use module_registry::{ModuleRegistry, AdvancedMonitoringConfig};

let registry = ModuleRegistry::new()
    .with_advanced_monitoring(true);

// Configure advanced monitoring
let monitoring_config = AdvancedMonitoringConfig::new()
    .with_metrics_collection(true)
    .with_performance_metrics(true)
    .with_security_metrics(true)
    .with_health_metrics(true)
    .with_logging(true)
    .with_structured_logging(true)
    .with_alerting(true)
    .with_real_time_alerting(true);

registry.configure_advanced_monitoring(monitoring_config)?;
```

### Health Monitoring

```rust
use module_registry::{ModuleRegistry, HealthMonitoringConfig};

let registry = ModuleRegistry::new()
    .with_health_monitoring(true);

// Configure health monitoring
let health_config = HealthMonitoringConfig::new()
    .with_health_checks(true)
    .with_health_metrics(true)
    .with_health_alerts(true)
    .with_health_dashboard(true);

registry.configure_health_monitoring(health_config)?;
```

## Error Handling

### Basic Error Handling

```rust
use module_registry::{ModuleRegistry, RegistryError};

let registry = ModuleRegistry::new();

// Handle registration errors
match registry.register(config) {
    Ok(_) => println!("Module registered successfully"),
    Err(RegistryError::ModuleAlreadyRegistered { name }) => {
        println!("Module '{}' is already registered", name);
    }
    Err(RegistryError::InvalidConfiguration { reason }) => {
        println!("Invalid configuration: {}", reason);
    }
    Err(RegistryError::DependencyNotFound { dependency }) => {
        println!("Dependency '{}' not found", dependency);
    }
    Err(RegistryError::CircularDependency { cycle }) => {
        println!("Circular dependency detected: {}", cycle);
    }
    Err(error) => {
        println!("Registration failed: {}", error);
    }
}
```

### Advanced Error Handling

```rust
use module_registry::{ModuleRegistry, ErrorHandler, RegistryError};

let error_handler = ErrorHandler::new()
    .with_graceful_degradation(true)
    .with_error_recovery(true)
    .with_error_logging(true)
    .with_error_reporting(true);

let registry = ModuleRegistry::new()
    .with_error_handler(error_handler);

// Handle errors with recovery
match registry.register(config) {
    Ok(_) => {
        println!("Module registered successfully");
    }
    Err(error) => {
        // Log the error
        log_error("Module registration failed", error);
        
        // Attempt recovery
        if let Some(recovery_action) = get_recovery_action(&error) {
            recovery_action.execute()?;
        }
        
        // Report the error
        report_error("Module registration failed", error);
    }
}
```

## Testing

### Unit Testing

```rust
use module_registry::{ModuleRegistry, ModuleConfig, ModuleType};

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    fn test_module_registration() {
        let registry = ModuleRegistry::new();
        let config = ModuleConfig::new()
            .with_name("test-module")
            .with_version("1.0.0")
            .with_type(ModuleType::DataProcessor);
        
        assert!(registry.register(config).is_ok());
        assert!(registry.is_registered("test-module"));
    }
    
    #[test]
    fn test_module_discovery() {
        let registry = ModuleRegistry::new();
        let config = ModuleConfig::new()
            .with_name("test-module")
            .with_version("1.0.0")
            .with_type(ModuleType::DataProcessor);
        
        registry.register(config).unwrap();
        
        let query = DiscoveryQuery::new()
            .with_name_pattern("test*");
        
        let modules = registry.discover(query).unwrap();
        assert_eq!(modules.len(), 1);
    }
    
    #[test]
    fn test_module_instantiation() {
        let registry = ModuleRegistry::new();
        let config = ModuleConfig::new()
            .with_name("test-module")
            .with_version("1.0.0")
            .with_type(ModuleType::DataProcessor);
        
        registry.register(config).unwrap();
        
        let instance = registry.create("test-module").unwrap();
        assert!(instance.process(b"test data").is_ok());
    }
}
```

### Integration Testing

```rust
use module_registry::{ModuleRegistry, ModuleConfig, ModuleType};

#[cfg(test)]
mod integration_tests {
    use super::*;
    
    #[test]
    fn test_end_to_end_workflow() {
        let registry = ModuleRegistry::new();
        
        // Register modules
        let config1 = ModuleConfig::new()
            .with_name("module1")
            .with_version("1.0.0")
            .with_type(ModuleType::DataProcessor);
        
        let config2 = ModuleConfig::new()
            .with_name("module2")
            .with_version("1.0.0")
            .with_type(ModuleType::DataProcessor)
            .add_dependency("module1");
        
        registry.register(config1).unwrap();
        registry.register(config2).unwrap();
        
        // Test workflow
        let instance1 = registry.create("module1").unwrap();
        let instance2 = registry.create("module2").unwrap();
        
        let data = b"test data";
        let result1 = instance1.process(data).unwrap();
        let result2 = instance2.process(&result1).unwrap();
        
        assert!(!result2.is_empty());
    }
}
```

## Best Practices

### Module Design

1. **Single Responsibility**: Each module should have a single, well-defined responsibility
2. **Interface Segregation**: Use focused interfaces rather than bloated ones
3. **Dependency Inversion**: Depend on abstractions, not concrete implementations
4. **Liskov Substitution**: Derived modules should be substitutable for base modules

### Registry Configuration

1. **Use Appropriate Configuration**: Configure the registry for your specific use case
2. **Environment-Specific Settings**: Use different configurations for different environments
3. **Security First**: Always enable security features in production
4. **Performance Optimization**: Optimize for your performance requirements

### Error Handling

1. **Graceful Degradation**: Handle errors gracefully without crashing
2. **Error Recovery**: Implement error recovery mechanisms where possible
3. **Error Logging**: Log errors for debugging and monitoring
4. **Error Reporting**: Report errors to monitoring systems

### Testing

1. **Comprehensive Testing**: Test all functionality thoroughly
2. **Unit Testing**: Test individual components in isolation
3. **Integration Testing**: Test component interactions
4. **Performance Testing**: Test performance characteristics
5. **Security Testing**: Test security features

## Troubleshooting

### Common Issues

1. **Module Registration Failures**: Check module configuration and dependencies
2. **Discovery Issues**: Verify discovery queries and module capabilities
3. **Instantiation Problems**: Check module implementation and dependencies
4. **Performance Issues**: Optimize configuration and resources
5. **Security Violations**: Review security policies and access controls

### Debugging

```rust
use module_registry::{ModuleRegistry, DebugConfig};

let debug_config = DebugConfig::new()
    .with_debug_logging(true)
    .with_verbose_output(true)
    .with_error_details(true)
    .with_validation_trace(true);

let registry = ModuleRegistry::new()
    .with_debug_config(debug_config);
```

### Performance Optimization

1. **Enable Caching**: Use caching for frequently accessed modules
2. **Optimize Resources**: Configure resource limits appropriately
3. **Monitor Performance**: Set up performance monitoring
4. **Profile Code**: Use profiling tools to identify bottlenecks

## Conclusion

This user guide provides comprehensive instructions for using the Module Registry effectively. By following these guidelines, you can create robust, secure, and performant module-based architectures.

Key takeaways:

1. **Module Registration**: Register modules with proper configuration
2. **Module Discovery**: Use appropriate discovery strategies
3. **Module Instantiation**: Create and use module instances effectively
4. **Configuration**: Configure the registry for your needs
5. **Security**: Implement comprehensive security measures
6. **Monitoring**: Set up monitoring and observability
7. **Testing**: Implement comprehensive testing strategies
8. **Best Practices**: Follow best practices for design and implementation