Advanced CORBA Programming with C++ by Michi Henning

By Michi Henning

Written for the skilled C++ developer dealing with real-world CORBA for the 1st time, complex CORBA Programming with C++ is an invaluable consultant to latest preferred common for allotted computing.After a brief journey of CORBA fundamentals, the authors bounce correct in with a minimal skeleton software written in C++. From there, they supply really wide assurance of CORBA IDL, in addition to many counsel for utilizing IDL facts varieties in C++. (They conceal complicated gains similar to any, TypeCode, and DynAny later within the book.).Next the e-book unveils its pattern program - a disbursed weather keep watch over method. fabric at the moveable item Adapter and the article existence Cycle, together with rubbish assortment innovations, rounds out this part. extra chapters research the main points of item Request agents (ORBs), together with web Inter-ORB Protocol (IIOP), repositories, and binding. The authors additionally current CORBA's integrated APIs for Naming, buying and selling, and occasion providers (including asynchronous occasion handling), that is most respected as reference material.Final sections learn innovations for higher scalability, together with multithreading and optimizing community site visitors for CORBA gadgets. The authors offer a number of brief excerpts of C++ code, notwithstanding it needs to be stated that a lot of this booklet is reference fabric instead of a hands-on programming instructional.

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An object reference is allowed to stop working only when its target object is permanently destroyed. After an object is destroyed, its references become permanently non-functional. This means that a reference to a destroyed object cannot accidentally denote some other object later. 37 IT-SC book: Advanced CORBAĀ® Programming with C++ An object can have several references. Several different references can denote the same object. In other words, each reference "names" exactly one object, but an object is allowed to have several names.

References can be nil. CORBA defines a distinguished nil value for object references. A nil reference points nowhere and is analogous to a C++ null pointer. Nil references are useful for conveying "not found" or "not there" semantics. For example, an operation can return a nil reference to indicate that a client's search for an object did not locate a matching instance. Nil references can also be used to implement optional reference parameters. " References can dangle. After a server has passed an object reference to a client, that reference is permanently out of the server's control and can propagate freely via means invisible to the ORB (for example, as a string carried by e-mail).

A client may actually hold a reference to a Manager but may think of that reference as being of type Employee. As in C++, a client cannot invoke Manager operations via an Employee reference (because that would violate static type safety). However, if a client invokes the number operation via the Employee reference, the corresponding message is still sent to the Manager servant that implements the Employee interface. This arrangement is exactly analogous to C++ virtual function calls: invoking a method via a base pointer calls the virtual function in the derived instance.

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