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Labs 5 - Spring JMS

Requirements

  • Run Linux on UAM workstation
  • Use IntelliJ IDEA

Goal

  • Get familiar with basic concept of spring application context
  • Get familiar with complex JMS Java code

Spring Framework introduction

  • Comprehensive programming and configuration model
  • Dependency Injection
  • Aspect-Oriented Programming (transaction management...)
  • Support for JDBC, JPA, JMS
  • Hello world example

Spring JMS

ActivaMQ specific:

User Stories

  • As a OfferService I want to publish offer on "offerTopic" topic
    • message should contain "buyQueue" for retailers to response (in javax.jms.Message#setJMSReplyTo) and price (Double)
  • As a OrderService I want to receive all offers from "offerTopic" topic
  • As a OrderService when price in offer is below my max price then I want to send buy message (javax.jms.MapMessage) with quantity and retailerID to queue (from javax.jms.Message#getJMSReplyTo)
  • As a BuyService I want to receive all buy messages from "buyQueue"

Exercise 1: implement wholesaler OfferService

  • Implement pl.edu.amu.dji.jms.lab2.wholesaler.service.OfferService#sendOffer method
  • Send map message by using org.springframework.jms.core.JmsTemplate#send(final Destination destination, final MessageCreator messageCreator) with:
    • Implement org.springframework.jms.core.MessageCreator#createMessage
    • Map message should contain
      • Price as a javax.jms.MapMessage#setDouble (use "price" string as a key)
      • OrderQueue as a javax.jms.Message#setJMSReplyTo
  • Go to /context.xml
    • Create pl.edu.amu.dji.jms.lab2.wholesaler.service.OfferService bean (set all properties)

Exercise 2: implement retailer BuyService

  • Implement pl.edu.amu.dji.jms.lab2.retailer.service.BuyService#onMessage method
    • Cast message to javax.jms.MapMessage
    • Get price from map message (javax.jms.MapMessage#getDouble, use "price" string as a key)
    • If price is ok (maxPrice.compareTo(price)==1) send order
      • Send order by using org.springframework.jms.core.JmsTemplate#send(final Destination destination, final MessageCreator messageCreator)
      • Use javax.jms.Message#getJMSReplyTo as a destination
      • Implement org.springframework.jms.core.MessageCreator#createMessage
      • Map message should contain
        • retailerID string with getClass().getName() as a value
        • quantity with some double value
  • Go to /context.xml
    • Create pl.edu.amu.dji.jms.lab2.retailer.service.BuyService (with buyService as a id)
      • Set all properties
    • Create org.springframework.jms.listener.SimpleMessageListenerContainer
      • Set messageListener property to buyService
      • Set connectionFactory property to connectionFactory
      • Set destination to offerTopic

Exercise 3: implement wholesaler OrderService

  • Implement pl.edu.amu.dji.jms.lab2.wholesaler.service.OrderService#onMessage
    • Just print quantity and retailerID
  • Go to /context.xml
    • Create pl.edu.amu.dji.jms.lab2.wholesaler.service.OrderService bean (with orderService as a id)
    • Create org.springframework.jms.listener.SimpleMessageListenerContainer
      • Set messageListener property to buyService
      • Set connectionFactory property to connectionFactory
      • Set destination to orderQueue

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