org.refcodes.factory

Interface LookupFactory<T,ID>

Type Parameters:

T - The expected type produced by the factory.

ID - The type of the ID being used.

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 LookupFactory<T,ID>

The LookupFactory 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 a predefined type specified with a generic argument (in contrast to the BeanLookupFactory, which creates instances of an expected type). Many alternative implementations of a LookupFactory 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 LookupFactory. 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 LookupFactory may return singletons or dedicated separate instances when queried for instances.

Method Summary

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

Method Detail

createInstance

T createInstance(ID aIdentifier)

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

Parameters:

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

Returns:

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

createInstance

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

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

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 for the given instance name (identifier).