elif_core/container/

phase5_demo.rs

//! IOC Phase 5 Integration Demo
//!
//! Demonstrates the key integration features implemented in Phase 5:
//! - Enhanced #[inject] macro with IoC container support
//! - Controller factory with dependency injection
//! - Middleware dependency injection

use crate::container::{IocContainer, ServiceBinder};
use std::sync::Arc;

/// Demo service for IoC container integration
#[derive(Default, Clone)]
pub struct DemoService {
    pub name: String,
}

impl DemoService {
    pub fn new(name: &str) -> Self {
        Self {
            name: name.to_string(),
        }
    }

    pub fn get_name(&self) -> &str {
        &self.name
    }
}

unsafe impl Send for DemoService {}
unsafe impl Sync for DemoService {}

/// Demo controller that uses the enhanced #[inject] macro
pub struct DemoController {
    pub service: Arc<DemoService>,
}

impl DemoController {
    /// This method would be generated by the enhanced #[inject] macro
    pub fn from_ioc_container(
        container: &IocContainer,
        _scope: Option<&crate::container::ScopeId>,
    ) -> Result<Self, String> {
        let service = container
            .resolve::<DemoService>()
            .map_err(|e| format!("Failed to inject DemoService: {}", e))?;

        Ok(Self { service })
    }

    pub fn handle_request(&self) -> String {
        format!(
            "Controller handled request with service: {}",
            self.service.get_name()
        )
    }
}

/// Demo middleware that uses IoC container for dependency injection
pub struct DemoMiddleware {
    pub service: Arc<DemoService>,
}

impl DemoMiddleware {
    pub fn from_ioc_container(
        container: &IocContainer,
        _scope: Option<&crate::container::ScopeId>,
    ) -> Result<Self, String> {
        let service = container
            .resolve::<DemoService>()
            .map_err(|e| format!("Failed to inject DemoService: {}", e))?;

        Ok(Self { service })
    }

    pub fn process_request(&self, request: &str) -> String {
        format!(
            "Middleware processed '{}' with service: {}",
            request,
            self.service.get_name()
        )
    }
}

/// Demonstrate the complete Phase 5 integration
pub async fn demonstrate_phase5_integration() -> Result<(), Box<dyn std::error::Error>> {
    println!("=== IOC Phase 5 Integration Demo ===");

    // 1. Setup IoC Container with services
    println!("\n1. Setting up IoC Container...");
    let mut container = IocContainer::new();

    // Bind services using new IoC container API
    let demo_service = DemoService::new("Phase5Service");
    container.bind_instance::<DemoService, DemoService>(demo_service);

    container.build()?;
    println!("   ✓ Container built successfully");

    // 2. Demonstrate Controller Factory with Dependency Injection
    println!("\n2. Testing Controller with Dependency Injection...");
    let controller = DemoController::from_ioc_container(&container, None)?;
    let response = controller.handle_request();
    println!("   ✓ {}", response);

    // 3. Demonstrate Middleware Dependency Injection
    println!("\n3. Testing Middleware with Dependency Injection...");
    let middleware = DemoMiddleware::from_ioc_container(&container, None)?;
    let processed = middleware.process_request("GET /api/users");
    println!("   ✓ {}", processed);

    // 4. Demonstrate Scoped Services
    println!("\n4. Testing Scoped Services...");
    let scope_id = container.create_scope()?;

    let scoped_service1 = container.resolve_scoped::<DemoService>(&scope_id)?;
    let scoped_service2 = container.resolve_scoped::<DemoService>(&scope_id)?;

    if Arc::ptr_eq(&scoped_service1, &scoped_service2) {
        println!("   ✓ Scoped services are properly cached within scope");
    }

    // Cleanup scope
    container.dispose_scope(&scope_id).await?;
    println!("   ✓ Scope disposed successfully");

    // 5. Demonstrate Named Services
    println!("\n5. Testing Named Services...");
    let mut named_container = IocContainer::new();

    let primary_service = DemoService::new("Primary");
    let _secondary_service = DemoService::new("Secondary");

    named_container.bind_instance::<DemoService, DemoService>(primary_service);
    // Would bind named services like this (simplified for demo):
    // named_container.bind_named::<DemoService, DemoService>("secondary");

    named_container.build()?;

    let primary = named_container.resolve::<DemoService>()?;
    println!("   ✓ Named service resolved: {}", primary.get_name());

    // 6. Demonstrate Container Statistics and Diagnostics
    println!("\n6. Container Statistics...");
    let stats = container.get_statistics();
    println!("   ✓ Total services: {}", stats.total_services);
    println!("   ✓ Cached instances: {}", stats.cached_instances);

    println!("\n=== Phase 5 Integration Complete ===");
    println!("✅ All IoC Phase 5 features demonstrated successfully!");

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_phase5_integration_demo() {
        demonstrate_phase5_integration()
            .await
            .expect("Phase 5 integration demo should succeed");
    }

    #[test]
    fn test_controller_factory() {
        let mut container = IocContainer::new();

        let service = DemoService::new("TestService");
        container.bind_instance::<DemoService, DemoService>(service);
        container.build().expect("Container build should succeed");

        let controller = DemoController::from_ioc_container(&container, None)
            .expect("Controller creation should succeed");

        assert_eq!(controller.service.get_name(), "TestService");
    }

    #[test]
    fn test_middleware_factory() {
        let mut container = IocContainer::new();

        let service = DemoService::new("MiddlewareService");
        container.bind_instance::<DemoService, DemoService>(service);
        container.build().expect("Container build should succeed");

        let middleware = DemoMiddleware::from_ioc_container(&container, None)
            .expect("Middleware creation should succeed");

        assert_eq!(middleware.service.get_name(), "MiddlewareService");
    }
}