ActiveMQ is best described as a classical messaging system. It was
written in 2004, filling a need for an open source message broker. At
the time if you wanted to use messaging within your applications, the
only choices were expensive commercial products.
ActiveMQ was designed to implement the Java Message Service (JMS)
specification. This decision was made in order to fill the requirement
for a JMS-compliant messaging implementation in the Apache Geronimo
project—an open source J2EE application server.
A messaging system (or message-oriented middleware, as it is sometimes
called) that implements the JMS specification is composed of the
following constructs:
Broker
The centralized piece of middleware that distributes messages.
Client
A piece of software that exchanges messages using a
broker. This in turn is made up of the following artifacts:
Your code, which uses the JMS API.
The JMS API—a set of interfaces for interacting with the broker
according to guarantees laid out in the JMS specification.
The system’s client library, which provides the implementation of the
API and communicates with the broker.
The client and broker communicate with each other through an application
layer protocol, also known as a wire protocol (Figure 2-1). The JMS specification
left the details of this protocol up to individual implementations.
Figure 2-1. JMS overview ...
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