Patterns: Implementing Self-Service in an SOA Environment

364 Patterns: Implementing Self-Service in an SOA Environment

Figure 11-2 Using mediation in the bus

11.2.2 Object model

The sequence diagram in Figure 11-3 shows how the Mail Service proxy sends

the e-mail message to MailService using JMS. Note that the application is

unaware that the ultimate receiver of the message requires XML format. The use

of the ESB makes the format transformation transparent to the sender.

Figure 11-3 Sequence diagram for sending e-mail message to MailService

1) The createCustomer() method in the Processor class is invoked.

1.1) createCustomer() invokes the sendActivationMail() method in the

MailService class, passing the customer information from the

registration.

Self Service Application

Processor EJB Module

Mail

Sender

MDB

Mail Service

Proxy

MailServiceEJB Module

To SMTP Ma il

Service

MailService Application

Service Integration Bus

Queue

Destination

JMS Msg

Act.

Spec.

JMS MsgJMS Msg

Mediation

TXT XML

1: createCustomer

1.1: sendActivationMail

1.1.1: sendMail

1.1.2 createTextMessage

1.1.4 setText

<<return>>

sendActivationMail

:Processor

:MailService

:Session

:MessageProducer

:TextMessage

<<return>>

1.1.3 createTextMessage

<<return>>

1.1.5 setText

1.1.6 createProducer

<<return>>

1.1.7 createProducer

<<return>>

1.1.9 send

1.1.8 send