# get abstract method

FutureOr<ObjectHolder<T>?> get([

1. Class? requiredType

])

Interface for objects that are themselves factories for other objects.

This interface is used when you need more control over object creation than simple instantiation provides. PodProvider can create objects dynamically, perform complex initialization, or return different instances based on configuration or runtime conditions.

PodProvider is a powerful pattern for:

- Creating objects that require complex initialization
- Returning different implementations based on configuration
- Integrating with external libraries or legacy code
- Creating proxy objects or decorators

## Key Concepts

- Object Creation: The get method creates and returns the actual object
- Type Information: The getClass method provides type information for dependency injection
- Lifecycle: The isSingleton method controls whether the same instance is returned each time

## Usage

Implement this interface to create custom factory pods:

    class DatabaseConnectionFactory implements PodProvider<DatabaseConnection> {
      final String connectionUrl;
      final String username;
      final String password;

      DatabaseConnectionFactory(this.connectionUrl, this.username, this.password);

      @override
      ObjectHolder<DatabaseConnection>? get() {
        return DatabaseConnection.create(
          url: connectionUrl,
          username: username,
          password: password,
        );
      }

      @override
      Class? getClass() => Class<DatabaseConnection>();

      @override
      bool isSingleton() => true; // Reuse the same connection
    }

## Registration

Factory pods are registered like normal pods:

    @Pod
    DatabaseConnectionFactory databaseConnectionFactory() {
      return DatabaseConnectionFactory(
        'jdbc:postgresql://localhost:5432/mydb',
        'user',
        'password',
      );
    }

## Accessing Factory vs Product

- To get the product: `context.getPod<DatabaseConnection>()`
- To get the factory: `context.getPod<PodProvider>('&databaseConnectionFactory')`

Creates and returns an instance of the object this factory manages.

This method is called by the container when a pod of type `T` is requested. The implementation should create and configure the object as needed.

## Return Value

- Returns an instance of type `T`, or `null` if the object cannot be created
- For singleton factories, the same instance should be returned on subsequent calls
- For prototype factories, a new instance should be created each time

## Example

    @override
    ObjectHolder<DatabaseConnection>? get() {
      final service = MyService();
      service.initialize(configurationProperties);
      return ObjectHolder(service);
    }

## Error Handling

If object creation fails, this method can:

- Return `null` to indicate failure
- Throw an exception with details about the failure

    @override
    Future<ObjectHolder<DatabaseConnection>?> get() async {
      try {
        return ObjectHolder(DatabaseConnection.connect(connectionString));
      } catch (e) {
        throw PodCreationException('Failed to create database connection: $e');
      }
    }

## Implementation

    FutureOr<ObjectHolder<T>?> get([Class? requiredType]);