GenericApplicationContext constructor

Generic ApplicationContext implementation that holds a single internal DefaultListablePodFactory instance and does not assume a specific pod definition format.

This class implements the ConfigurableApplicationContext interface to allow for convenient registration of pod definitions and classes as well as programmatic registration of singletons. It serves as a flexible base for various application context implementations in the JetLeaf framework.

Key Features:

• Programmatic Registration: Register pods and singletons via code
• Flexible Configuration: No assumptions about pod definition formats
• Lifecycle Management: Full context lifecycle support
• Parent Context Support: Hierarchical context relationships
• Post-Processing: Extensible processor architecture

Context Lifecycle:

1. Construction: Context created with internal pod factory
2. Registration: Pod definitions and singletons registered
3. Refresh: Context initialized and pods instantiated
4. Operation: Pods available for dependency injection
5. Destruction: Context closed and resources cleaned up

Important Note:

The refresh method must be called exactly once after all pod definitions are registered and before any pod access attempts.

Usage Example:

void main() async {
  // Create context
  final context = GenericApplicationContext();

  // Register pod definitions programmatically
  final podDef = RootPodDefinition(type: Class<UserService>());
  context.registerDefinition('userService', podDef);

  // Register singleton instances
  context.getPodFactory().registerSingleton(
    'configService', 
    ConfigService()
  );

  // Refresh to initialize the context
  await context.refresh();

  // Use the context
  final userService = context.getPod<UserService>('userService');
  await userService.processUsers();

  // Close context when done
  await context.close();
}

Advanced Configuration:

// With custom pod factory
final customFactory = DefaultListablePodFactory();
customFactory.setAllowCircularReferences(true);
final context = GenericApplicationContext.withPodFactory(customFactory);

// With parent context for hierarchical lookup
final parentContext = GenericApplicationContext();
final childContext = GenericApplicationContext.withParent(parentContext);

Framework Integration:

This context does not support special pod definition formats by default. For contexts that read pod definitions from annotations, configuration files, or other external sources, consider using specialized subclasses like AnnotationConfigApplicationContext.

See also:

• AbstractApplicationContext for the base implementation
• ConfigurableApplicationContext for the configuration interface
• DefaultListablePodFactory for the internal pod factory
• AnnotationConfigApplicationContext for annotation-based configuration

Creates a new GenericApplicationContext with default settings.

The context is created with a new DefaultListablePodFactory and no parent context. You must call refresh after registering all pod definitions to initialize the context.

Example:

final context = GenericApplicationContext();
// Register pods...
await context.refresh();