EJB 3.0 course Sildes and matrial

1. Mohamed Ali Ibrahim
Inform IBM

3.  Server-side component that encapsulates the
business logic of an application.
 Simplify the development of large, distributed
applications.
 Focusing on solving business problems.
 Provide transactions and security
management.
 Benefits: Scalability , data integrity and Client
variety.
 EJB Container

4.  Session Bean
◦ Stateless
◦ Stateful
◦ Singleton
 Message Driven Bean(JMS)

5.  EJB Interfaces:
◦ Local interface
◦ No interface.
◦ Remote interface.
 EJB Access
◦ Dependency injection (@EJB)
◦ JNDI lookup :
InitialContext.lookup("java:module/ExampleBean");

7.  Could have a timeout
 Bean instance is destroyed.
 EJB object is invalidated
 Instances are identical.
 Act as a webservice.
 life Cycle Methods(@PostConstruct, @PreDestroy)

9.  Share state between all methods
 Could have a timeout
 Can be removed.
 Bean instance is destroyed.
 Can be passivated.
 life Cycle Methods(@PostConstruct, @PreDestroy,
@PrePassivate,@ PostActivate )

11.  Shared between all clients.
 Concurrent accessed.
 Can depend on other singleton EJB.
 Bean instance is destroyed.
 Could have a timeout.
 Having Concurrency Management.
 life Cycle Methods(@Startup, @PostConstruct,
@PreDestroy)

12.  Stateless Bean:
 Other stateless bean, stateful bean, singleton,
all JSF managed bean, servlets.
 Stateful Bean:
 Other stateful bean, JSF session bean.
 Singleton:
 Stateless bean, stateful bean, other singleton,
all JSF managed bean, servlets.

13.  @Remove
 @DependsOn
 @ConcurrencyManagement
 @Lock
 @AccessTimeout(value=120000)
 @Schedule(dayOfWeek="Sun", hour="0")
 @Schedules
 @Timeout
 @Asynchronous

14.  Replaced in EJB 3.0 with persistence.
 Entity.
 Entity Manager.
 Persistence Unit(Persistance.xml).
 DataSource.
 Relations:OneToOne, OneToMany,
ManyToOne, ManyToMany.

15.  Atomic , Consistent, Isolated, Durable.
 TransactionManagementType:
◦ CONTAINER Based
◦ BEAN Based
 TransactionAttribute:
◦ Required
◦ RequiresNew
◦ Mandatory
◦ NotSupported
◦ Supports
◦ Never
 TransactionOperation:
◦ UserTransaction
 Begin()
 Commit()
 Rollback()
 setTimeOut()

18. TransactionAttribute Client’sTransaction BusinessMethod’sTra
nsaction
REQUIRED None T2
REQUIRED T1 T1
REQUIRES_NEW None T2
REQUIRES_NEW T1 T2
MANDATORY None Error
MANDATORY T1 T1
NEVER None None
NEVER T1 Error
SUPPORTS None None
SUPPORTS T1 T1
NOT_SUPPORTED None None
NOT_SUPPORTED T1 None

19.  Resource Adapter
 EISs: ERP, mainframe transaction processing ,and
database system
 Attributes
◦ Authentication-Type , description , name , lookup ,
shareable , type

20.  @Resource(name="customerDB") private
javax.sql.DataSource myDB;
 @Resource(name="customerDB") private void
setMyDB(javax.sql.DataSource ds) { myDB = ds; }
 @Resource(name="myMessageQueue",
type="javax.jms.ConnectionFactory") public class
SomeMessageBean {}

21.  Authentication , Authorization, User, User
Groups, User Roles.
 @DeclareRoles
 @RolesAllowed
 @PermitAll
 @DenyAll

22.  @Embeddable ,
@Embedded,@AttributeOverrides({})
 @AroundInvoke ,
@Interceptors({interceptorClass.class})
 @WebService, @WebMethod

23.  What Is Messaging.
 JMS API.

24.  Administered objects:
◦ Connection factories
◦ destinations
 Connections
 Sessions
 JMS Context
 Messages
 Message producers
 Message consumers:
◦ Listeners
◦ Selectors
 Queue Browsers

26.  Message header:
◦ JMSDestination
◦ JMSDeliveryMode
◦ JMSDeliveryTime
◦ JMSExpiration
◦ JMSPriority
◦ JMSMessageID
◦ JMSTimestamp
◦ JMSCorrelationID
◦ JMSReplyTo
◦ JMSType
◦ JMSRedelivered
 Message Properties
 Message body:
◦ TextMessage
◦ MapMessage
◦ BytesMessage
◦ StreamMessage
◦ ObjectMessage
◦ Message

29. 1. The client receives the message.
2. The client processes the message.
3. The message is acknowledged:
1. Automatic
2. Client
3. DUPS_OK_ACKNOWLEDGE
 Un-Durable subscriptions
 Durable subscriptions
◦ ensure that a pub/sub application receives all sent
messages

30. Consumer Type Acknowledgment
Type
Behavior
Synchronous Client Client acknowledges message
after processing is complete
Asynchronous Client Client acknowledges message
after processing is complete
Synchronous Auto Acknowledgment happens
immediately after receive call;
message cannot be redelivered if
any subsequent processing steps
fail
Asynchronous Auto Message is automatically
acknowledged when onMessage
method returns

31. Un-durable
Durabile

33.  @MessageDriven
 @ActivationConfigProperty
 @JMSConnectionFactory
 @JMSDestinationDefinition
 @JMSConnectionFactoryDefinition