The framework code calls the customized/specific code, not the opposite.
Software Frameworks
Gerson Sunyé
Agenda
Introduction
Definition
In Short, a Framework is
Creating Real-World Applications by
Framework Goals
Properties
Basic Properties
Modularity
Reusability
Extensibility
Inversion of Control
The Hollywood Principle
Dependency Inversion
Open-Closed Principle
Design Principles
Principles
Template Method Pattern
Template Method
Template Method Example
public void openDocument(String name) {
if (!canOpenDocument(name)) {
// cannot handle this document
return;
}
Document doc = doCreateDocument();
if (doc != null) {
docs.add(doc);
aboutToOpenDocument(doc);
doc.open();
doc.doRead();
}
}
Template Method Behavior
Hook Methods
Annotations
1. "Attribute" in C# or "Decorator" in Python
Annotations in JUnit
Figure 1. JUnit 3 test cases are all methods from subclasses of
TestCase starting with "test"
Figure 2. JUnit 4 test cases are all methods decorated with
@TestDependency Injection
Dependency Injection and the Dependency Injection Principle
The Dependency Problem
The
Risk Servershould only depend on theBoard RepositoryHowever,
Risk Servermust instantiate the classHibernate Board Repository, creating a dependency to a concrete class.
Figure 3. The RiskServer class must instantiate a concrete class, breaking the DIP
The Injector to the Rescue
The Injector Class
Responsibilities
Find all the dependencies for
Risk ServerFind all implementation of
Board RepositoryInstantiate
Hibernate Board Repositoryand assign the instance toRisk Server
It’s a Kind of Magic!
A Toy Example[Greg Butler]
Domain
Bouncing-Bumping Games
Class Diagram
