Figure 22 OMA object frameworks in Software

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Figure 22 OMA object frameworks
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These models may not seem very complicated or profound, but their apparent simplicity is misleading Many pages of this book, as well as other books, articles, and
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specifications, are devoted to exploring the effects and consequences of these seemingly simple models, so this is all we will say about them for now See [31] for more details about the OMA and the OMG
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23 Concepts and Terminology
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CORBA provides platform-independent programming interfaces and models for portable distributed object-oriented computing applications Its independence from programming languages, computing platforms, and networking protocols makes it highly suitable for the development of new applications and their integration into existing distributed systems Like all technologies, CORBA has unique terminology associated with it Although some of the concepts and terms are borrowed from similar technologies, others are new or different Understanding these terms and the concepts behind them is key to having a firm grasp of CORBA itself The most important terms in CORBA are explained in the following list A CORBA object is a "virtual" entity capable of being located by an ORB and having client requests invoked on it It is virtual in the sense that it does not really exist unless it is made concrete by an implementation written in a programming language The realization of a CORBA object by programming language constructs is analogous to the way virtual memory does not exist in an operating system but is simulated using physical memory A target object, within the context of a CORBA request invocation, is the CORBA object that is the target of that request The CORBA object model is a single-dispatching model in which the target object for a request is determined solely by the object reference used to invoke the request A client is an entity that invokes a request on a CORBA object A client may exist in an address space that is completely separate from the CORBA object, or the client and the CORBA object may exist within the same application The term client is meaningful only within the context of a particular request because the application that is the client for one request may be the server for another request A server is an application in which one or more CORBA objects exist As with clients, this term is meaningful only in the context of a particular request A request is an invocation of an operation on a CORBA object by a client Requests flow from a client to the target object in the server, and the target object sends the results back in a response if the request requires one An object reference is a handle used to identify, locate, and address a CORBA object To clients, object references are opaque entities Clients use object references to direct requests to objects, but they cannot create object references from their constituent parts,
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nor can they access or modify the contents of an object reference An object reference refers only to a single CORBA object A servant is a programming language entity that implements one or more CORBA objects Servants are said to incarnate CORBA objects because they provide bodies, or implementations, for those objects Servants exist within the context of a server application In C++, servants are object instances of a particular class The definitions of these terms will be refined in later chapters, but these definitions will be sufficient for understanding the CORBA features described in the next section
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24 CORBA Features
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This section provides an overview of the following major features of CORBA: OMG Interface Definition Language Language mappings Operation invocation and dispatch facilities (static and dynamic) Object adapters Inter-ORB Protocol Figure 23 shows the relationships between most of these CORBA features, which we describe in the following sections Later chapters cover each feature in much greater detail
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Figure 23 Common Object Request Broker Architecture (CORBA)
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241 General Request Flow In Figure 23, the client application makes requests and the server application receives them and acts on them Requests flow down from the client application, through the ORB, and up into the server application in the following manner
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