DISTRIBUTED SYSTEMS USING CORBA AND ADA Victor Giddings The MITRE Corporation vtg @mitre, org Let's say that you are building a system that must Broker (ORB) which, in the OMG Object Management maintain information tied to location and display it on Architecture (OMA) provides a network-transparent a map. After an exhausting, though not exhaustive, and language-transparent means to transfer "requests" evaluation, you decide that the Object Oriented Geofrom clients to servers and "responses" in the reverse graphic Information System from Oscar Gump Softdirection. Figure 1 shows the OMA; all entities in the OMA, except the ORB, arc objects. The ORB can be ware (OGOOGISi) will provide you many of the capabilities that you need and ~ ~ ~ thought of as the "glue" at the right price, but it's los that binds the client to written in Smalltalk. the server, although it is a That's actually OK, beflexible and far-reaching cause ~ I S comes glue. Besides applicawith an interface defined tions objects and the in OMG IDLTM. You stuff ORB, the other entities in this IDL into your operatthe OMA are objects that ing system-bundled "IDL provide Common Object compiler", specifying Services, such as persisthat you wish
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