Editing Message-oriented middleware (section)

==Middleware categories==
*[[Remote procedure call]] or RPC-based middleware
*[[Object request broker]] or ORB-based middleware<ref name="CORBA">{{Cite book|title=Common Object Request Broker Architecture |url=https://www.omg.org/spec/CORBA/}}</ref>
*[[Message-oriented middleware]] or MOM-based middleware

All these models make it possible for one software component to affect the behavior of another component over a network. They are different in that RPC- and ORB-based middleware create systems of tightly coupled components, whereas MOM-based systems allow for a [[loose coupling]] of components. In an RPC- or ORB-based system, when one procedure calls another, it must wait for the called procedure to return before it can do anything else. In these mostly [[synchronous messaging]] models, the middleware functions partly as a super-linker, locating the called procedure on a network and using network services to pass function or method parameters to the procedure and then to return results.<ref name=oracle/> Note that [[Object request broker]]s also support fully [[asynchronous messaging]] via oneway invocations.<ref name=CORBA/>