Spring:
usarlo conviene, ma usalo bene
Lucio Benfante
lucio@benfante.com
verona.javaday.it www.jugpadova.it

Inversion Of Control (IoC)
Inversion of control, or IoC, is an abstract
principle describing an aspect of some
software architecture designs in which the
flow of control of a system is inverted in
comparison to procedural programming.
from wikipedia

Dependencies are BAD
List drugs = new ArrayList();

IoC and Dependency Injection (DI)
Inversion of Control
Dependency Lookup Dependency Injection
Setter injection Constructor Injection

Spring framework?
IoC container

Inject your objects
<beans>
<bean id=”person1” class=”com.myapp.Person”>
<property name=”firstName” value=”Lucio”/>
<property name=”lastName” value=”Benfante”/>
<property name=”bornIn” ref=”venice”/>
</bean>
<bean id=”venice” class=”com.myapp.City”>
<constructor-arg value=”Venezia”/>
</bean>
</beans>

XML is boring

Spring in Parancoe demonstration
(www.parancoe.org)

References
● http://www.objectmentor.com/resources/articles/dip.pdf
● http://martinfowler.com/articles/injection.html
● http://martinfowler.com/bliki/InversionOfControl.html
● www.springframework.org
● www.parancoe.org
●