Description
The CompositeFactory class allows you to aggregate multiple factories into a single factory component.
Important points
- When a new component is requested, it iterates through factories to locate the one able to create the requested component.
- Usually used to keep all supported factories in a single place.
Constructors
NewCompositeFactoryFromFactories
Creates a new instance of the factory.
NewCompositeFactoryFromFactories(factories …IFactory) *CompositeFactory
- factories: …IFactory - list of factories to embed into this factory.
NewCompositeFactory
NewCompositeFactory() *CompositeFactory
Methods
Add
Adds a factory into the list of embedded factories.
(c *CompositeFactory) Add(factory IFactory)
- factory: IFactory - factory to be added.
CanCreate
Checks if this factory is able to create a component by a given locator.
This method searches for all registered components and returns a locator for component it is able to create that matches the given locator. If the factory is not able to create a requested component it returns nil.
(c *CompositeFactory) CanCreate(locator any) any
- locator: any - a locator to identify component to be created.
- returns: any - a locator for a component that the factory is able to create.
Create
Creates a component identified by given locator.
(c *CompositeFactory) Create(locator any) (any, error)
- locator: any - locator to identify component to be created.
- returns: (any, error) - created component.
Remove
Removes a factory from the list of embedded factories.
(c *CompositeFactory) Remove(factory IFactory)
- factory: IFactory - factory to remove.
Examples
factory := NewCompositeFactory();
factory.Add(NewDefaultLoggerFactory());
factory.Add(NewDefaultCountersFactory());
loggerLocator := NewDescriptor("*", "logger", "*", "*", "1.0")
factory.CanCreate(context.Background(), loggerLocator) // Result: Descriptor("pip-service", "logger", "null", "default", "1.0")
factory.Create(context.Background(), loggerLocator) // Result: created NullLogger