ASE - Messaging Services Users Guide

Peter Kitson

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Sample Chapter From ASE - Messaging Services Users Guide
     Copyright © Sybase Inc.



Adaptive Server messaging concepts

Messaging is the exchange of information by two or more software
applications. A message is a self-contained package of information.

Many Adaptive Server customers use messaging and queuing, or
publishing and subscription systems in their own application
environments. These applications are called message-oriented
middleware. Often the same application combines database operations
with messaging operations.

Real-Time Data Services (RTDS), simplifies the development of such
applications, using Adaptive Server with TIBCO Enterprise Messaging
Service (EMS).

Note EMS is the TIBCO implementation of a Java messaging service
(JMS). Since Adaptive Server only supports EMS, the reference to EMS
and JMS refer to the same thing in this document.


Messaging systems allow senders and receivers to be detached. Not all
components must be running, and connected for operation at all times. A
messaging system can be asynchronous, in that an application can send
messages without requiring receiving applications to be running.

JMS are APIs that define the way in which clients communicate with message
providers. The message sender and the message receiver both act as clients to
the message provider.

Messaging systems are provided by message providers. The messaging
provider can implement architecture that is centralized or decentralized, or a
hybrid of the two.

Adaptive Server performs messaging operations within SQL statements, using
built-in functions.
Real-Time Data Services provide a way to capture transactions (data changes)
in an Adaptive Server database and deliver them as events to external
applications using JMS message bus, provided by TIBCO EMS.