By Firth D.R.
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Extra info for Balanced constant current excitation for dynamic strain measurements
This aspect will be addressed in more detail later in this book. The figure below shows how the middleware hides the network services and other details of remote communication from clients and server applications. The middleware is an additional software layer that sits between the network services offered by the operating system and the application layer hosting the client and server application. fm Page 8 Friday, September 24, 2004 8:57 PM 8 Introduction To Distributed Systems Client Server Client Application Server Application Middleware Network Services Network Services Operating System Kernel Operating System Kernel Network layer, the middleware hides the heterogeneity between the underlying platforms from application developers.
It should be possible to host remote objects on different machines without having to adapt the client’s program code. Therefore: Separate the communication functionality of a distributed system from its application functionality by isolating all communication related concerns in a BROKER. The BROKER hides and mediates all communication between the objects or components of a system. A BROKER consists of a client-side REQUESTOR to construct and forward invocations, as well as a server-side INVOKER that is responsible for invoking the operations of the target remote object.
In the following section we take a closer look at two important, additional participants of the BROKER-based applications: remote objects and the server application. Note that these are not participants of the BROKER pattern itself, they are merely necessary in applications that use a BROKER as their communications backbone. Remote objects Consider you are using or building distributed object middleware that is used to access objects remotely. Clients need to access functionality provided by remote application objects.