August 2013
Intermediate to advanced
362 pages
8h 40m
English
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Chapter 14. Java Message Service
The Java Message Service is defined as JSR 343, and the complete specification can be downloaded.
Message-oriented middleware (MOM) allows sending and receiving messages between distributed systems. Java Message Service (JMS) is a MOM that provides a way for Java programs to create, send, receive, and read an enterprise messaging system’s messages.
JMS defines the following concepts:
- JMS provider
An implementation of the JMS interfaces, included in a Java EE implementation.
- JMS client
A Java program that produces and/or receives messages. Any Java EE application component can act as a JMS client.
- JMS message
An object that contains the data transferred between JMS clients. A JMS producer/publisher creates and sends messages. A JMS consumer/subscriber receives and consumes messages.
- Administered objects
Objects created and preconfigured by an administrator. They typically refer to
ConnectionFactoryandDestination, and are identified by a JNDI name. TheConnectionFactoryis used to create a connection with the provider. TheDestinationis the object used by the client to specify the destination of messages it is sending and the source of messages it is receiving.
JMS supports two messaging models: Point-to-Point and Publish-Subscribe.
In the Point-to-Point model, a publisher sends a message to a specific destination, called a queue, targeted to a subscriber. Multiple publishers can send messages to the queue, but each message is delivered and consumed by one ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.