org.refcodes.factory

Interface ContextTypeFactory<T,CTX>

Type Parameters:

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

CTX - The context which may influence the object being created by this 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 ContextTypeFactory<T,CTX>

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

Method Summary

Modifier and Type	Method and Description
T	createInstance(CTX aContext) 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(CTX aContext, 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(CTX aContext)

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:

aContext - The context which may influence the object being created by this factory.

Returns:

The instance being fabricated by this factory.

createInstance

default T createInstance(CTX aContext,
                         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:

aContext - The context which may influence the object being created by this factory.

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

Returns:

The instance being fabricated by this factory.