Implementation Factory
by kirk knoernschild
Statement
Use factories to create a modules implementation classes.
Description
One of the challenges we face with abstract coupling is creation of the implementation class. A client class cannot create an implementation class if we want the two classes abstractly coupled. Figure 1 illustrates the Implementation Factory pattern.
Figure 1: Implementation Factory Pattern
Implementation Variations
Implementation Factory is often used with Abstract Module and Separate Abstractions.
Where does the factory live.
What is the factory? Class or framework such as Spring.
Injection or Lookup.
Consequences
Sample Code
Figure 1: Implementation Factory using Spring
In abstract modules, we were left wondering how to create the implementation class without referencing the concrete class within the client.jar module.