1. Java EE 6 CDI Integrates
with Spring & JSF
on Java EE 5
Jiayun Zhou jiayun@jiayun.org
2012/03/17
TWJUG

2. 先鋒的第一次 迎新再對折

3. CDI
• JSR 299: Contexts and Dependency
Injection
• Java EE 6
3

5. Copyright by IISI. All rights reserved 5

6. Copyright by IISI. All rights reserved 6

7. • http://www.slideshare.net/johaneltes/java-ee6-cdi

8. Inversion of Control
vs
Dependency Injection

9. IoC
Inversion of Control
9

10. IoC
Inversion of Control Flow
10

11. Martin Fowler
11

12. Command Line
#ruby
puts 'What is your name?'
name = gets
process_name(name)
puts 'What is your quest?'
quest = gets
process_quest(quest)
12

13. GUI
require 'tk'
root = TkRoot.new()
name_label = TkLabel.new() {text "What is Your Name?"}
name_label.pack
name = TkEntry.new(root).pack
name.bind("FocusOut") {process_name(name)}
quest_label = TkLabel.new() {text "What is Your Quest?"}
quest_label.pack
quest = TkEntry.new(root).pack
quest.bind("FocusOut") {process_quest(quest)}
Tk.mainloop()
13

14. Hollywood Principle
Don’t call us, we’ll call you.
14

15. Ex. HttpSessionListener
• sessionCreated()
• sessionDestroyed()
15

16. Ex. Template Method Pattern
16

17. Dependency Injection
One Form of IoC
17

18. class MovieLister...
public Movie[] moviesDirectedBy(String arg) {
List allMovies = finder.findAll();
for (Iterator it = allMovies.iterator(); it.hasNext();) {
Movie movie = (Movie) it.next();
if (!movie.getDirector().equals(arg)) it.remove();
}
return (Movie[]) allMovies.toArray(new
Movie[allMovies.size()]);
}
18

19. public interface MovieFinder {
List findAll();
}
19

20. class MovieLister...
private MovieFinder finder;
public MovieLister() {
finder = new
ColonDelimitedMovieFinder("movies1.txt");
}
20

21. 21

22. 22

23. Spring Stereotype
• @Component
• @Repository
• @Service
• @Controller
23

24. @Repository
class ColonMovieFinder...
public void setFilename(String filename) {
this.filename = filename;
}
24

25. Spring @Autowired
class MovieLister...
private MovieFinder finder;
@Autowired
public void setFinder(MovieFinder finder) {
this.finder = finder;
}
25

26. CODI
• Apache MyFaces Extensions CDI
project
26

27. 同時作業Demo
27

28. 同時作業Demo
28

31. Weld
• CDI Implementation
• Included in WebLogic 12c
• Running on WebLogic 11g
31

32. Libraries
<dependency>
<groupId>org.jboss.weld.servlet</groupId>
<artifactId>weld-servlet</artifactId>
</dependency>
<dependency>
<groupId>org.apache.myfaces.extensions.cdi.bundles</groupId>
<artifactId>myfaces-extcdi-bundle-jsf20</artifactId>
</dependency>
<dependency>
<groupId>org.apache.myfaces.extensions.cdi.modules.jee5-support</groupId>
<artifactId>myfaces-extcdi-jee5-weld-support</artifactId>
<scope>runtime</scope>
</dependency>

33. Libraries
<dependency>
<groupId>org.cdisource.springbridge</groupId>
<artifactId>springbridge</artifactId>
</dependency>
<dependency>
<groupId>org.cdisource.beancontainer</groupId>
<artifactId>beancontainer-weld-impl</artifactId>
</dependency>

34. web.xml
<listener>
<listener-
class>org.cdisource.springintegration.servletsupport.ApplicationC
ontextFinderServletContextListener</listener-class>
</listener>
<listener>
<listener-
class>org.apache.myfaces.extensions.cdi.weld.startup.WeldAwareCon
figurationListener</listener-class>
</listener>

35. beans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
</beans>
• src/main/webapp/WEB-INF
• src/main/resources
都要放

36. Spring Bridge
• src/main/resources/META-
INF/services/javax.enterprise.inject.spi.Extension
• 內容：
org.cdisource.springintegration.SpringIntegration
Extention
• Service Provider Interface (SPI)
http://docs.oracle.com/javase/7/docs/api/java/
util/ServiceLoader.html

37. Spring 掃描排除 CDI Bean
<context:component-scan base-
package="com.xxx">
<context:exclude-filter type="regex"
expression="com.xxx.*.web.*" />
</context:component-scan>

38. Controller 引用 Service
@WindowScoped
@XxxExceptionCatcher
@Named("xxxController")
public class XxxController implements Serializable {
@Inject
@Spring(name = "registerService")
private transient RegisterService registerService;
38

39. CDI AOP (annotation)
@InterceptorBinding
@Target({ ElementType.TYPE,
ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface XxxExceptionCatcher {
}

40. CDI AOP (interceptor)
@Interceptor
@RisExceptionCatcher
public class XxxExceptionInterceptor implements
Serializable {
@AroundInvoke
public Object catchException(InvocationContext
ctx) throws Exception {

41. CDI AOP (beans.xml)
<interceptors>
<class>com.xxx.XxxExceptionInterceptor</class>
</interceptors>

42. Logger
@WindowScoped
@XxxExceptionCatcher
@Named("xxxController")
public class XxxController implements Serializable {
@Inject
private Logger logger;
• http://www.slf4j.org/faq.html#declared_static
42

43. LoggerFactory
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import org.slf4j.Logger;
public class LoggerFactory {
@Produces
Logger createLogger(InjectionPoint injectionPoint) {
String name =
injectionPoint.getMember().getDeclaringClass().getName();
return org.slf4j.LoggerFactory.getLogger(name);
}
}
43

44. References
• http://seamframework.org/Weld/WeldDocum
entation
• https://cwiki.apache.org/confluence/display/E
XTCDI/Documentation
44

45. Sample Code
• https://github.com/jiayun/cdisource
• https://github.com/jiayun/java_misc_samples
45

46. WebLogic 12c
• 必須解壓 CODI jar 到 WEB-INF/classes
• 已回報給 Oracle

47. - Thank You -