The JMS server acts as a hub in a hub-and-spoke network, receiving and distributing messages. Applications that send and receive messages are clients that connect to the JMS server via TCP. JMS offers two messaging types: point-to-point queues that send messages to a specific application, and publish-subscribe topics that broadcast messages to multiple subscribers. Durable subscriptions allow applications to receive topic messages even when disconnected.

1. Main features of the JMS serverRecapitulation of the basics of the JMS server

2. Main features of the JMS serverRecapitulation of the basics of the JMS serverThe purpose of this section is to remind you of the main features of the Prodco JMS server.

3. Hub and spoke networkA corporate integrated system is a number of separate applications like data bases, process engines etc.

4. Hub and spoke networkTogether these different applications work on the company’s business processes.

5. Hub and spoke networkThey co-ordinate their activities by exchanging messages.The Prodco JMS server is a means of exchanging messages.

6. The server is the hubServerThe JMS server is at the centre of the network. The server receives and distributes messages.

7. Each client is a spokeServerClientApplications which send and receive messages are clients of the JMS server.

8. Each client is a spokeServerClientClients connect to the JMS server using the TCP protocol.

9. QueuesQueueWhen one or more applications send messages to one particular application, they put the messages on a queue.

10. A queueAudit and print purchase ordersManufacturingServicingACME.PURCHASEORDER.REQUESTFacilitiesEMS serverThis queue takes requests for purchase orders from all over the business to an application that prints purchase orders.

11. TopicsQueueTopicThe other sort of messaging uses a topic. A topic is like a broadcast: it conveys each message to several consumers.

12. Durable subscriptionsQueueTopicIf an application needs to receive messages that were sent on the topic while the application was disconnected…

13. Durable subscriptionsQueueTopic…the application can create a durable subscription, and the server will hold messages for it while it is unavailable.

14. A topicMail handlingWebsiteCall centreACME.ORDER.NEWProduction planningCredit checkInventory checkEMS serverIn this example orders arrive from various sources and the topic carries the orders to various applications.

15. ReviewJMS is an API specification fromSun Micro SystemsJMS messaging is a hub and spoke designThe JMS server is at the hubClients are the spokesJMS offers two types of message sendingPoint to point with queuesBroadcast with topics