Middleware

Middleware model

Middleware is tech “glue” connecting components of a distributed system. The middleware model is

Middleware

Components of middleware include

• The network services include things like TCP/IP

• The middleware layer is application-independent s/w using the network services.

• Examples of middleware are: DCE, RPC, Corba

• Middleware may only perform one function (such as RPC) or many (such as DCE)

Middleware examples

Examples of middleware include

• Primitive services such as terminal emulators, file transfer, email
• Basic services such as RPC
• Integrated services such as DCE, Network O/S
• Distributed object services such as CORBA, OLE/ActiveX
• Mobile object services such as RMI, Jini
• World Wide Web

Middleware functions

The functions of middleware include

• Initiation of processes at different computers
• Session management
• Directory services to allow clients to locate servers
• Remote data access
• Concurrency control to allow servers to handle multiple clients
• Security and integrity
• Monitoring
• Termination of processes both local and remote