Designing Messaging Solutions with JMS

1
Designing Messaging Solutions with JMS

• Eric Whipple
• AAA of Michigan

2
Agenda

• Introduction
• Choosing an Application Model
• JMS Messages
• JMS Application Style
• JMS and XML
• JMS and EJBs
• Conclusion

3
Introduction

• Message-Oriented Middleware
• JMS Terminology
• Client
• Server
• Destination
• Producer/Consumer

4
JMS Application Models

• Publish/Subscribe
• Topics
• Publisher
• Subscriber

• Point to Point
• Queue
• Sender
• Receiver

5
JMS Messages

• Properties
• Headers
• Body

6
JMS Message Types

• TextMessage
• BytesMessage
• MapMessage
• StreamMessage
• ObjectMessage

7
Basic JMS Example
8
Application Style Elements

• Sending Messages
• Persistent Messages
• Guaranteed Delivery
• Transacted Sessions
• Receiving Messages
• Push/Pull Model
• Durable Subscriptions
• Message Selection

9
JMS and XML

• Text and TextMessages
• Using JMS Properties
• Using Java Objects

10
XML and TextMessages

• lt?xml version1.0" encoding"UTF-8"?gt
• ltordergt
• ltcustomernamegtEric Whipplelt/customernamegt
• ltitemnumbergt34456lt/itemnumbergt
• ltquantitygt10lt/quantitygt
• lt/ordergt
• TextMessage textMessage getTopicSession(false).c
  reateTextMessage(message)
• getTopicPublisher().publish(textMessage)
• if (isTransacted())
• getTopicSession(false).commit()

11
XML and JMS Properties

• lt?xml version1.0" encoding"UTF-8"?gt
• ltordergt
• ltcustomernamegtEric Whipplelt/customernamegt
• ltitemnumbergt34456lt/itemnumbergt
• ltquantitygt10lt/quantitygt
• lt/ordergt
• TextMessage textMessage getTopicSession(false).c
  reateTextMessage(message)
• textMessage.setStringProperty("EVENT_TYPE",eventTy
  pe)
• getTopicPublisher().publish(textMessage)
• if (isTransacted())
• getTopicSession(false).commit()

12
XML and Java Objects

• Order order new Order()
• order.setCustomerName(Eric Whipple)
• order.setItemNumber(34456)
• order.setQuantity(10)
• ObjectMessage objMessage getTopicSession(false).
  createObjectMessage(order)
• objMessage.setStringProperty("EVENT_TYPE",eventTyp
  e)
• getTopicPublisher().publish(objMessage)
• if (isTransacted())
• getTopicSession(false).commit()

13
JMS in the Enterprise

• JMS as an Enterprise Event Notification Service
• JMS and EJBs

14
JMS in the Enterprise
15
Conclusion

• JMS IS GOOD.