Why message-oriented middleware?

摘要

In use in the information-technology sector for more than a decade, message-oriented middleware (MOM) decouples applications. Legacy information technology systems worked much like SCADA poll/response protocols do today. Applications were tightly coupled, using protocol definition to determine how application A talked to application B. As a point-in-time solution these worked fine. But over time, tight coupling and strict definitions made it difficult, if not impossible, to update legacy IT applications.