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What is Spring?
2 Things:
An Inversion of Control (IoC) Container
Utilities that provide a consistent (and simple!
API to many other technologies (JDBC, ORM,
AOP, Declarative Transactions, etc)

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Guiding Principles of Spring
Minimize dependencies on Spring
Minimize dependencies between all layers of an
application.
All application code should be testable, without an
application server or other complex environment
Fully factor the APIs (the 90% case should be
accomplished in one line of code!)

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businessanalyst.vibranttechnologies.co.inWhat is Inversion of Control (IoC)?
(besides yet another confusing term for a simple concept)
IoC is all about Object dependencies.
Traditional "Pull" approach:
Direct instantiation
Asking a Factory for an implementation
Looking up a service via JNDI
"Push" approach:
Something outside of the Object "pushes" its
dependencies into it. The Object has no knowledge
of how it gets its dependencies, it

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The BookDemo Application:
(A simple CRUD app)
User Interface
Service Layer
Data Access Layer
DB
Domain
Model

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Pull Example
public class BookDemoServicePullImpl implements BookDemoServic
public void addPublisherToBook(Book book) {
BookDemoFactory factory = BookDemoFactory.getFactory()
BookDemoDao dao = factory.getBookDemoDao();
String isbn = book.getIsbn();
if (book.getPublisher() == null && isbn != null) {
Publisher publisher = dao.findPublisherByIsbn(isbn
book.setPublisher(publisher);
}
}
}

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Push Example
(Dependency Injection)public class BookDemoServiceImpl implements
BookDemoService {
private BookDemoDao dao;
public void addPublisherToBook(Book book) {
String isbn = book.getIsbn();
if (book.getPublisher() == null && isbn !=
null) {
Publisher publisher =
dao.findPublisherByIsbn(isbn);
book.setPublisher(publisher);
}
}

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Why is Dependency Injection better?
2 reasons:
Loose Coupling
Testability
Loose Coupling is improved because you don't hard-code depende
between layers and modules. Instead you configure them outside
the code. This makes it easy to swap in a new implementation of
service, or break off a module and reuse it elsewhere.
Testability is improved because your Objects don't know or care wh
environment they're in as long as someone injects their
dependencies. Hence you can deploy Objects into a test environm
and inject Mock Objects for their dependencies with ease.

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How Spring does Inversion of Control
Write a configuration file in which you name
concrete "beans" for the interfaces between your
layers.
"Wire" the application together by stating which
beans are dependent on each other.

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Example Spring applicationContext.xml
<beans>
<bean id="bookDemoDao"
class="com.bookdemo.dao.hibernate.BookDemoDaoHibernateImpl">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<bean id="bookDemoService"
class="com.bookdemo.service.impl.BookDemoServiceImpl
<property name="bookDemoDao">
<ref bean="bookDemoDao"/>
</property>
</bean>

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Bootstapping the IoC container
To start an app using IoC:
Create an ApplicationContext object and tell it
where applicationContext.xml is.
ApplicationContext appContext =
new ClassPathXmlApplicationContext("classpath*:applicationContext.xml");
This just has to be done once on startup, and can be done in the main
method or whatever code bootstraps the application.

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Bootstapping the IoC container
For web applications the situation is simpler:
Web applications are bootstrapped by the web
container based on the web.xml file. Hence
creating an ApplicationContext on startup is as
simple as a single declaration in web.xml:
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

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