Prodco

Recapitulation of the basics of the JMS server

Main features of the JMS server

Prodco

Recapitulation of the basics of the JMS server

Main features of the JMS server

The purpose of this section is to remind you of the main features of the Prodco JMS server.

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Hub and spoke network

A corporate integrated system is a number of separate applications like data bases, process engines etc.

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Hub and spoke network

Together these different applications work on the company’s business processes.

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Hub and spoke network

They co-ordinate their activities by exchanging messages.The Prodco JMS server is a means of exchanging messages.

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The server is the hub

Server

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

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Each client is a spoke

Client

Server

Applications which send and receive messages are clients of the JMS server.

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Each client is a spoke

Client

Server

Clients connect to the JMS server using the TCP protocol.

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Queues

Queue

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

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A queue

Manufacturing Servicing

Facilities

ACME.PURCHASEORDER.REQUEST

Audit and print purchase orders

EMS server

This queue takes requests for purchase orders from all over the business to an application that prints purchase orders.

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Topics

Queue Topic

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

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Durable subscriptions

Queue Topic

If an application needs to receive messages that were sent on the topic while the application was disconnected…

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Durable subscriptions

Queue Topic

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

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A topic

ACME.ORDER.NEW

EMS server

Mail handling Website

Credit check Inventory check

Call centre

Production planning

In this example orders arrive from various sources and the topic carries the orders to various applications.

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Review

JMS is an API specification fromSun Micro Systems

JMS messaging is a hub and spoke designThe JMS server is at the hub

Clients are the spokesJMS offers two types of message sending

Point to point with queuesBroadcast with topics