电子科技女学 Software Architecture Design Pattern University af Electronic Science and Technoloryf Chim -There are three kinds of middleware systems:transaction-oriented middleware,message-oriented middleware,and object-oriented middleware. +Transaction-oriented middleware supports distributed computing involving database applications. +Message-oriented middleware supports reliable,asynchronous communications among distributed components. +Object-oriented middleware systems are based on object-oriented paradigm,and primarily supports synchronous communications among distributed components. -The most popular object-oriented middleware paradigms include CORBA,DCOM,DotNET,and EJB (which is based on RMI) +All these middleware systems,also referred to as Object-Oriented middleware, are based on the Remote Procedure Call (RPC)framework foundation. They extend RPC framework by introducing object-oriented mechanisms. 6 Software Architecture and Design Pattern 7Software Architecture & Design Pattern Software Architecture and Design Pattern 7