Java EE 6 CDI Integrates with Spring & JSF

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

先鋒的第一次迎新再對折

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

3

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

Inversion of Control
vs
Dependency Injection

IoC

Inversion of Control

9

IoC

Inversion of Control Flow

10

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

12

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

Hollywood Principle

Don’t call us, we’ll call you.

14

Ex. HttpSessionListener
• sessionCreated()
• sessionDestroyed()

15

Ex. Template Method Pattern

16

Dependency Injection

One Form of IoC

17

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

public interface MovieFinder {
List findAll();
}

19

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

20

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

23

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

24

Spring @Autowired
private MovieFinder finder;

@Autowired
public void setFinder(MovieFinder finder) {
this.finder = finder;
}

25

CODI
• Apache MyFaces Extensions CDI
project

26

同時作業Demo

27

同時作業Demo

28

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

31

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>

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

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>

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

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

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>

Controller 引用 Service
@WindowScoped
@XxxExceptionCatcher
@Named("xxxController")
public class XxxController implements Serializable {

@Inject
@Spring(name = "registerService")
private transient RegisterService registerService;

38

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

}

CDI AOP (interceptor)
@Interceptor
@RisExceptionCatcher
public class XxxExceptionInterceptor implements
Serializable {

@AroundInvoke
public Object catchException(InvocationContext
ctx) throws Exception {

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

Logger
@WindowScoped
@XxxExceptionCatcher
@Named("xxxController")
public class XxxController implements Serializable {

@Inject
private Logger logger;

• http://www.slf4j.org/faq.html#declared_static

42

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

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

44

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

45

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

Java EE 6 CDI Integrates with Spring & JSF

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