org.refcodes.factory

Interface BeanLookupFactory<ID>

Type Parameters:

ID - The type of the ID to be used.

All Known Subinterfaces:

BeanFactory<ID>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface BeanLookupFactory<ID>

The BeanLookupFactory defines the functionality which must be provided in order to represent a factory for object creation of objects identified by an ID String and of the expected type (in contrast to the TypeFactory and the LookupFactory which create instances of a predefined type specified with a generic argument). Many alternative implementations of a BeanLookupFactory may may exist which construct the instances their way.

Having factories that generic as we define it here, we are able to decouple our business logic from any specific framework: Your business logic must not know anything about how the instances are generated. It mainly just needs to know how to use the BeanLookupFactory. It is up to the application "end point", i.e. a command line tool with a main-method or a web-application to finally decide which factory to use.

Depending on the implementation used or configuration provided, the BeanLookupFactory may return singletons or dedicated separate instances when queried for instances.

Method Summary

Modifier and Type	Method and Description
<T> T	createInstance(ID aIdentifier) This method creates / retrieves an instance of the given type identified with the given identifier (name).
default <T> T	createInstance(ID aIdentifier, Map<String,String> aProperties) This method creates / retrieves an instance of the given type identified with the given identifier (name).

Method Detail

createInstance

<T> T createInstance(ID aIdentifier)

This method creates / retrieves an instance of the given type identified with the given identifier (name).

Type Parameters:

T - The type which is to be fabricated by the factory method.

Parameters:

aIdentifier - The name identifying the instance to be created / retrieved.

Returns:

The instance being fabricated by this factory of the required type for the given instance name (identifier).

Throws:

ClassCastException - in case the fabricated type is not type compatible with the required type T.

createInstance

default <T> T createInstance(ID aIdentifier,
                             Map<String,String> aProperties)

This method creates / retrieves an instance of the given type identified with the given identifier (name).

Type Parameters:

T - The type which is to be fabricated by the factory method.

Parameters:

aIdentifier - The name identifying the instance to be created / retrieved.

aProperties - The dynamic properties which are used to configure the desired bean.

Returns:

The instance being fabricated by this factory of the required type for the given instance name (identifier).

Throws:

ClassCastException - in case the fabricated type is not type compatible with the required type T.