# initialize abstract method

void initialize(

1. T applicationContext

)

Strategy interface for initializing an ApplicationContext before it is refreshed.

Application context initializers provide a hook for programmatic configuration of the context before the refresh process begins. They are particularly useful for:

### Common Use Cases:

- Programmatic Configuration: Register pods or adjust settings via code
- Environment Setup: Configure profiles or property sources
- Custom Validation: Validate context configuration before refresh
- Integration Setup: Prepare integration with external systems
- Feature Flags: Enable/disable features based on configuration

### Execution Context:

- Initializers are called after the context is created
- But before the pod factory is refreshed
- In the order defined by Ordered or `@Order` annotation
- All initializers are called even if one fails

### Example:

    class DatabaseInitializer implements ApplicationContextInitializer<GenericApplicationContext> {
      @override
      void initialize(GenericApplicationContext context) {
        // Configure database settings before refresh
        final env = context.getEnvironment();

        if (env.acceptsProfiles({'cloud'})) {
          // Use cloud database configuration
          context.getPodFactory().registerSingleton(
            'dataSource',
            CloudDataSource(env.getProperty('cloud.db.url'))
          );
        } else {
          // Use local database configuration
          context.getPodFactory().registerSingleton(
            'dataSource',
            LocalDataSource(env.getProperty('local.db.path'))
          );
        }

        logger.info('Database configuration initialized');
      }
    }

    class SecurityInitializer implements ApplicationContextInitializer<GenericApplicationContext> {
      @override
      void initialize(GenericApplicationContext context) {
        // Set up security configuration
        context.getPodFactory().registerSingleton(
          'securityConfig',
          SecurityConfig(
            enabled: context.getEnvironment().getProperty('security.enabled', bool.fromString, true),
            jwtSecret: context.getEnvironment().getRequiredProperty('security.jwt.secret')
          )
        );
      }
    }

    void main() async {
      final ctx = GenericApplicationContext();

      // Register initializers
      ctx.addApplicationContextInitializer(DatabaseInitializer());
      ctx.addApplicationContextInitializer(SecurityInitializer());

      // Initializers will be called during refresh
      await ctx.refresh();
    }

Initialize the given `applicationContext` before refresh.

This method is called during the context refresh process, after the context is created but before any pods are instantiated. It provides an opportunity to programmatically configure the context.

### Parameters:

- `applicationContext`: The application context being initialized

### Typical Operations:

- Register additional pod definitions
- Configure the environment or property sources
- Set up application-specific context attributes
- Validate configuration state
- Register custom factories or processors

### Example:

    @override
    void initialize(GenericApplicationContext context) {
      // Access and modify the pod factory
      final factory = context.getPodFactory();
      factory.registerSingleton('appMetadata', AppMetadata(
        version: '1.0.0',
        buildTime: DateTime.now()
      ));

      // Configure based on environment
      final env = context.getEnvironment();
      if (env.acceptsProfiles({'testing'})) {
        factory.registerSingleton('emailService', MockEmailService());
      } else {
        factory.registerSingleton('emailService', ProductionEmailService(
          apiKey: env.getRequiredProperty('email.api.key')
        ));
      }

      // Set custom context attributes
      context.setAttribute('deployment.region', 'us-west-2');
    }

### Error Handling:

Exceptions thrown from initializers will typically prevent the context from refreshing successfully. Initializers should handle their own exceptions or throw meaningful error messages.

## Implementation

    void initialize(T applicationContext);