refresh abstract method

Refreshes this application context:

• Loads or reloads pod definitions.
• Instantiates singletons.
• Initializes application components.
• Publishes lifecycle events.

The refresh process is the core initialization sequence that transitions the context from configured to active state.

Refresh Sequence:

1. Prepare Refresh: Validate state, prepare internal structures
2. Obtain Fresh Factory: Create new pod factory instance
3. Prepare Factory: Register core pods and configuration
4. Post-process Factory: Apply pod factory post-processors
5. Register Processors: Register pod-aware processors
6. Initialize Message Source: Set up internationalization
7. Init Application Event Bus: Initialize event system
8. Register Listeners: Register application event listeners
9. Instantiate Singletons: Create non-lazy singleton pods
10. Finish Refresh: Complete initialization, publish events

Example:

try {
  await context.refresh();
  print('Context refreshed successfully');
  print('Active pods: ${context.getPodDefinitionNames()}');
} on PodDefinitionException catch (e) {
  print('Pod configuration error: ${e.message}');
  exit(1);
} on Exception catch (e) {
  print('Context refresh failed: $e');
  exit(1);
}

Throws:

• IllegalStateException if the context has not been properly configured
• PodDefinitionException if pod definitions are invalid
• Various runtime exceptions if initialization fails

Important:

This method should be called exactly once during the context lifecycle.