SIDEBAR: A SOA Glossary
Enterprise service bus: A software infrastructure that uses a standard interface and messaging to integrate applications; one way to implement a SOA. (Note: The term, which was coined in a report by Gartner, is relatively new.)
Loosely coupled: The use of well-defined interfaces to connect services; SOAs are built using a loosely coupled approach, where a change in one service does not require changes in linked services.
Message-oriented middleware (MOM): Sometimes referred to as a message-oriented architecture, MOM provides a mechanism for connecting various applications, even across platforms. Data resides in message queues where receiving programs can retrieve it without creating a direct connection with the sending applications.
Publish-subscribe: System where services post (or "publish") data that other services can request (or "subscribe" to). When the published information changes, the subscribed services automatically receive updates.
Service-oriented architecture (SOA): An architecture built around a collection of reusable components with well-defined interfaces.
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