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Middleware Technologies compiled by: Thomas M. Cosley
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Introduction 4 Middleware is connectivity software that provides a mechanism for processes to interact with other processes running on multiple networked machines. 4 Middleware Application Programming Interfaces provide a more functional set of capabilities than the OS and network services provide on their own.
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Middleware Architecture Platform – OS Platform – OS Middleware (Distributed Systems Services) API’s Platform Interface Application Network Interface
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Types of Middleware 4 There are four basic types of middleware –Transaction Processing Monitor (TP) –Remote Procedure Call (RPC) –Message-Oriented Middleware (MOM) –Object Request Broker (ORB)
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Transaction Processing (TP) 4 TP can provide the following –control transaction applications –provide business logic/rules –database updates
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Transaction Processing Architecture Client TP Monitor Transaction Requests Processing Routines
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Remote Procedure Call (RPC) 4 RPC is a client/server mechanism that allows the program to be distributed across multiple platforms. 4 RPC’s reduce the complexity of a system that spans multiple operating systems and network protocols by hiding OS and network interface details from the programmer.
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Remote Procedure Call (cont’d) 4 RPC’s are usually implemented by: –proprietary products –proprietary development tools that create client server stubs 4 Most RPC implementations use a synchronous (call/wait) protocol to communicate between client and server.
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RPC Architecture RPC STUB RPC STUB Client App Server App TRANSPORTTRANSPORT TRANSPORTTRANSPORT NETWORKNETWORK NETWORKNETWORK Application Specific procedure invocations and returns
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Message Oriented Middleware (MOM) 4 Message-oriented middleware –functionality similar to RPC –provides asynchronous communication between client and server applications by queueing messages temporarily when one or the other is busy or not connected.
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Server App MOM Architecture Client App TRANSPORTTRANSPORT TRANSPORTTRANSPORT NETWORKNETWORK NETWORKNETWORK Application specific proprietary messages MOM With message queue With message queue
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Object Request Broker (ORB) 4 ORB’s overcome; machine, software and vendors are no boundaries for the ORB. 4 Major functionality includes: –interface definition –location and activation of remote objects –communication between clients and objects
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ORB Architecture Client Remote Service (object) Request Service activate Service Establish connection communicate
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