1、外文原文 Chapter 1. Understanding the Messaging Paradigm Computers and people can communicate by using messaging systems to exchange messages over electronic networks. The most ubiquitous messaging system today is email, which facilitates communication among people. While email is an important human-to-
2、human messaging system, this book is not about email. Instead, this book is concerned with messaging systems that allow different software applications to communicate with each other. These application-to-application messaging systems, when used in business systems, are generically referred to as en
3、terprise messaging systems, or Message-Oriented Middleware (MOM). Enterprise messaging systems allow two or more applications to exchange information in the form of messages. A message, in this case, is a self-contained package of business data and network routing headers. The business data containe
4、d in a message can be anythingdepending on the business scenarioand usually contains information about some business transaction. In enterprise messaging systems, messages inform an application of some event or occurrence in another system. Using Message-Oriented Middleware, messages are transmitted from one application to another across a network. MOM products ensure that messages are properly distributed among applications. In addition, MOMs usually provide fault tolerance, load balancing, s
