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Fundamentals of Distributed Object Systems: The CORBA by Zahir Tari

By Zahir Tari

Dispensed item Computing teaches readers the basics of CORBA, the prime structure for layout of software program utilized in parallel and dispensed computing purposes. on the grounds that CORBA relies on open criteria, it's the in simple terms powerful solution to examine object-oriented programming for dispensed platforms. This language self sufficient publication permits fabric to learn utilizing Java, C++ or different item orientated Programming Languages.

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Extra info for Fundamentals of Distributed Object Systems: The CORBA Perspective

Example text

A self-contained Java operating environment which simulates a separate computer) to be invoked from another JVM even when this JVM is across a network. 1 and is essentially object-oriented Java RPC. , methods for RMI and procedures for RPC) involved. The description is later used to produce stub and skeleton. 12 illustrates, the flow of a request is also not much different from its RPC counterpart. However, RMI does have some differences compared to RPC. The first one is that, IDL in RPC is usually based on procedural C, while IDL is RMI is based on object-oriented Java.

The only difference is that, it returns S OK to the client, which notifies the successful execution of the function called. hh" int main(void) { // Local declarations DISTRIBUTED SYSTEM TECHNOLOGIES 29 IUnknown *pUnknown; ICounter *pCounter; int counterVal = 0; // Initialize server CoInitialize(NULL); // Instantiate a DCOM class CoCreateInstance(CLSID_Counter, NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, (**void) &pUnknown); // Check if the object supports ICounter interface pUnknown->QueryInterface(IID_ICounter, (void**) &pCounter); // Perform and verify getCount function execution pCounter->getCount(&counterVal); count << "Current counter value is " << counterVal << endl; // Perform and verify increase function execution pCounter->increase(10); // Perform and verify decrease function execution pCounter->decrease(5); // Perform and verify getCount function execution pCounter->getCount(&counterVal); cout << "Current counter value is " << counterVal << endl; // Decrease the object’s reference counter pUnknown->Release(); // Remove server initializations CoUninitialize(); return(EXIT_SUCCESS); } All DCOM library functions in the above sample code starts with Co prefix.

A system is considered being open if its key software interfaces are published, that is, the interfaces are specified, documented, and made available publicly to software developers. This process is similar to the process of standardizing these interfaces since both make the interfaces publicly available. However, the former does not require the interfaces to pass official standardization process before they are made available. An example of more open systems are UNIX systems. Resources of these system are used via system calls, that is, a set of procedures which are made available to programs and other languages that support conventional procedure facilities.

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