org.refcodes.factory

Interface TypeFactory<T>

Type Parameters:

T - The type of the instances being served by the factory.

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 TypeFactory<T>

The TypeFactory defines the functionality which must be provided in order to represent a factory for object creation 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 TypeFactory 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 TypeFactory. 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 TypeFactory may return singletons or dedicated separate instances when queried for instances.

Method Summary

Modifier and Type	Method and Description
T	createInstance() This method creates / retrieves an instance of the given type with the given identifier (name) constructed as defined in one to many configuration files.
default T	createInstance(Map<String,String> aProperties) This method creates / retrieves an instance of the given type with the given identifier (name) constructed as defined in one to many configuration files.

Method Detail

createInstance

T createInstance()

This method creates / retrieves an instance of the given type with the given identifier (name) constructed as defined in one to many configuration files. How the instance is configured, created or retrieved is up to the nature (implementation) of the according factory.

Returns:

The instance being fabricated by this factory.

Throws:

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

createInstance

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

This method creates / retrieves an instance of the given type with the given identifier (name) constructed as defined in one to many configuration files. How the instance is configured, created or retrieved is up to the nature (implementation) of the according factory.

Parameters:

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

Returns:

The instance being fabricated by this factory.

Throws:

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