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Alexis Hassler

Alexis Hassler
• Développeur, formateur Java
• Indépendant
• Co-leader du
• @AlexisHassler

Java EE 1° partie
http://www.public-domain-image.com/

Java EE
CDI
JSF
EJB 3
JPA
JAX-RS
WebSocket

CDI
JCA

MQTT
Broker
Consumer
Consumer
Consumer
Producer
Producer
Producer
Topic
Topic
Topic
Topic
Publish Subscribe

MQTT
http://www.galuzzi.it/

MQTT
http://commons.wikimedia.org/wiki/File:St_Jude_Medical_pacemaker_with_ruler.jpg

MQTT

JCA2° partie
http://www.public-domain-image.com/

Java
Connector
Architecture

Connector Java EE
Java EE
App EIS

Outbound

Java EE
Connector
App EIS

Java EE
App
DataSource

Resource
public class SomeNiceBean {
@Resource(name="jdbc/SomeDS")
DataSource dataSource;
public void doTheJob() {
Connection connection = dataSource.getConnection();
...
}
}

MQTT Connection Factory
public class SomeNiceBean {
@Resource(name="mqtt/QuestionCF")
ConnectionFactory connectionFactory;
public void doTheJob() {
connectionFactory.getConnection()
.publish(message);
}
}

Resource Adapter
Connection ManagedConnection
API Implementation
ManagedConnection
Factory
ConnectionFactory

ManagedConnection
Factory
ConnectionFactory
new
ManagedConnection
new
ConnectionManager
Connection
ResourceAdapter
new
ConnectionEvent
Listener XAResource
LocalTransaction
ManagedConnection
MetaData

Inbound

Java EE
App
Connector
EIS

Message Driven Bean
Java EE
MDB
JMS
Destination
Connector

JMS Message Driven Bean
@MessageDriven(activationConfig = {
@ActivationConfigProperty(propertyName="destinationLookup",
propertyValue="swt/Question"),
@ActivationConfigProperty(propertyName="destinationType",
propertyValue="javax.jms.Queue"),
})
public class MyJmsBean implements MessageListener {
@Override
public void onMessage(Message message) {
...
}
}

MQTT Message Driven Bean
@MessageDriven(
activationConfig = {
@ActivationConfigProperty(propertyName = "topicName",
propertyValue = "swt/Question")
}
)
public class MyMqttBean implements MqttListener {
@Override
public void onMessage(Message message) {
...
}
}

ActivationSpec
API Implementation
Message
Listener ResourceAdapter
BootstrapContext
WorkerManager
XAResource

Connector API
public interface MqttListener {
void onMessage(Message message);
}
public class Message {
private byte[] payload;
public Message(byte[] payload) {
this.payload = payload;
}
// + Getter
}

Message Driven Bean ++
@MessageDriven
public class MyMqttBean implements MqttListener {
@TopicName("swt/Question")
public void onQuestion(Message message) {
...
}
@TopicName("swt/Answer")
public void onAnswer(Message message) {
...
}
}

Connector
mqtt-ra.rar
Application
(w. MDB)
mqtt-ra-example.war
WildFly
MQTT
Broker
(mosquitto)
MQTT Client
mosquitto
pub/sub

C D I 3° partie
http://www.picturesdepot.com/

Context & Dependency Injection
• IoC pour Java EE et Java SE
• Gestion des contextes
• Liant pour la plupart des spec Java EE
• Moteur d’extensions pour Java EE

http://commons.wikimedia.org/
Bean

@Inject

Dependency Injection
public class MessageService {
@Override
public String message() {
return "Bonjour le monde !";
}
}

Dependency Injection
public class HelloBean {
@Inject MessageService service;
public void displayHello() {
display( frService.message() );
}
}

Highlander Rule
there can be
only one
http://pixabay.com/

Qualifiers
public class FrenchMessageService
implements MessageService {
public String message() {
return "Bonjour le monde !";
}
}
public class EnglishMessageService
implements MessageService {
public String message() {
return "Hello World!";
}
}

Qualifiers
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD, PARAMETER})
public @interface French {}
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD, PARAMETER})
public @interface English {}

Qualifiers
@French
public class FrenchMessageService
implements MessageService {
public String message() {
return "Bonjour le monde !";
}
}
@English
public class EnglishMessageService
implements MessageService {
public String message() {
return "Hello World!";
}
}

Qualifiers
public class HelloBean {
@Inject @French MessageService service;
public void displayHello() {
display(service.message());
}
}

Programmatic
Lookup
http://pixabay.com/

Programmatic lookup
public class HelloBean {
@Inject Instance<MessageService> service;
public void displayHello() {
if (! service.isUnsatisfied()) {
display(service.get().message());
}
}
}

Programmatic lookup
public class HelloBean {
@Inject @Any
Instance<MessageService> services;
public void displayHello() {
for (MessageService service : services) {
display(service.message());
}
}
}

Contexts
@Dependent
@RequestScoped
@ConversationScoped
@SessionScoped
@ApplicationScoped
public class MessageService {
...
}

Decorators
@Decorator
@Priority(Interceptor.Priority.APPLICATION)
public class MessageDecorator
implements MessageService {
@Inject @Delegate @Any MessageService service;
public String message() {
return service.message() + " -decorated";
}
}
http://pixabay.com/

Interceptors
http://commons.wikimedia.org/

Interceptors
@InterceptorBinding
@Target({METHOD, TYPE})
@Retention(RUNTIME)
public @interface Loggable {}

@Interceptor @ILnoggtabeler ceptors
public class LogInterceptor {
@AroundInvoke
public Object log(InvocationContext ic)
throws Exception {
System.out.println("Entering "
+ ic.getMethod().getName());
try {
return ic.proceed();
} finally {
System.out.println("Exiting "
+ ic.getMethod().getName());
}
}
}

Interceptors
@Loggable
public class HelloBean {
@Inject MessageService service;
public void displayHello() {
display(service.message());
}
}

Producers
http://commons.wikimedia.org/

Producers
public class FacesProducer {
@Produces @RequestScoped
public FacesContext produceFacesContext() {
return FacesContext.getCurrentInstance();
}
}

Producers
@Produces
public Logger produceLogger(
InjectionPoint injectionPoint) {
String loggerName = injectionPoint
.getMember()
.getDeclaringClass()
.getName();
return Logger.getLogger(loggerName);
}

public class HelloBean {
@Inject MessageService service;
@Inject Event<Message> messageEvent;
public void displayHello() {
display(service.message());
messageEvent.fire(
new Message(frService.message()));
}
}
Events

Events
public class MessageReceiver {
public void receive(@Observes Message message) {
System.out.println("Received: " + message.text);
}
}

Synthèse
Decoration Interception Event JavaEE
Injection Context
Integration
Portable Extension

CDI
Portable Extensions

Bean Manager
https://www.kingbean.com/

Bean Manager
• Interagir avec le conteneur CDI
• Lecture seule
• Injectable
• JNDI
• java:comp/BeanManager
public class HelloBean {
@Inject BeanManager beanManager;
...
}

Extension
• Manipuler les métadonnées du container
• AnnotatedType
• InjectionPoint / InjectionTarget
• BeanAttributes / Beans
• Producer, Observer
• Pendant le démarrage

Comment ?
En observant les
événements
déclenchés par le
conteneur CDI

Exemple (-)
• Exclure les entités JPA
public class VetoEntityExtension
implements Extension {
public void vetoEntity(
@Observes @WithAnnotations({Entity.class})
ProcessAnnotatedType<?> pat) {
pat.veto();
}
}

Exemple (+)
• Ajouter un bean
public class HashMapAsBeanExtension
implements Extension {
public void addHashMapAsAnnotatedType(
@Observes BeforeBeanDiscovery bbd,
BeanManager beanManager) {
bbd.addAnnotatedType(
beanManager.createAnnotatedType(HashMap.class)
);
}
}

CDI 1.1 Lifecycle
Before Bean
Discovery
Process Bean
Scan
Archive
Process
Annotated
Type
After
Deployment
Validation
Application
Running
Before
Shutdown
Undeploy
Application
After Bean
Discovery
Process
Producer
Process
Injection
Target
Process
Observer
Method
Process
Injection
Point
Process Bean
Attributes
After Type
Discovery
événement unique
événements multiples
étape interne
Deployment
starts
Bean
eligibility
check

Application
mqtt-cdi-example.war
WildFly
MQTT
Broker
(mosquitto)
MQTT Client
mosquitto
pub/sub
http://pixabay.com/

4° partie
JCA // CDI

CDI
JCA

Managed Connection Factory
@ConnectionDefinition
(connectionFactory = MqttConnectionFactoryImpl.class,
connectionFactoryImpl = MqttConnectionFactoryImpl.class,
connection = BlockingConnection.class,
connectionImpl = BlockingConnection.class)
public class MqttManagedConnectionFactory
implements ManagedConnectionFactory,
ResourceAdapterAssociation, Serializable {
@Inject
ResourceAdapter ra;
}

JCA
CDI

public class SomeNiceBean {
@Inject
MqttConnectionFactory connectionFactory;
public void doTheJob() {
javax.enterprise.inject.
Connection connection = connectionFactory.getConnection();
...
}
UnsatisfiedResolutionException
}

Java EE 8
• Implicit Producers ?
• Ambiguities ?
• Qualifiers ?

JCA // CDI

JCA
ManagedConnection
Factory
ConnectionFactory
new
ManagedConnection
new
ConnectionManager
Connection
ResourceAdapter
new
ConnectionEvent
Listener
XAResource
LocalTransaction
ManagedConnection
MetaData
WorkerManager

CDI
UserTransaction
ManagedExecutor
Service
ConnectionFactory
Producer
ConnectionFactory
new
Connection
LocalTransaction

Outbound Connector
JCA < CDI

Message Driven Bean
@MqttDriven
public class MyMqttBean {
@TopicName("swt/Question")
public void onQuestion(Message message) {
...
}
@TopicName("swt/Answer")
public void onAnswer(Message message) {
...
}
}

Message Observer
@ApplicationScoped
public class MyMqttBean {
public void onQuestion(
@Observes @TopicName(value = "swt/Question")
Message message) {
...
}
public void onAnswer(
@Observes @TopicName("swt/QuestionBis")
Message message) {
...
}
}

Threads
https://www.flickr.com/photos/mckaysavage/6491930649/

Inbound Connector
JCA > CDI

Java EE Application Server
App
CDI
App
CDI
App
CDI
JCA

?
http://pixabay.com/fr/point-d-interrogation-boule-demande-65833/

Exemples
• https://github.com/antoinesd/cdi-demo
• https://github.com/sewatech/mqtt-ra/
• https://github.com/hasalex/mqtt-cdi
• http://fr.slideshare.net/sewatech/

Version longue
• Part 1 : Intro + CDI
• https://parleys.com/play/536749d1e4b04bb59f502706
• Part 2 : JCA + Synthèse
• https://parleys.com/play/5369f1f9e4b04bb59f502725