The idea behind CORBA is to model distributed resources as objects that provide a well-defined interface, and to invoke services through remote invocations (RPCs). Since the transfer syntax for sending messages to objects is strictly defined, it is possible to exchange requests and replies between processes running program written in arbitrary programming languages and hosted on arbitrary hardware and operating systems. Target addresses are represented as Interoperable Object References (IORs), which contain transport addresses as well as identifiers needed to dispatch incoming messages to implementations.
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The Java Developer Connection SM (JDC) presents a Short Course introducing the Common Object Request Broker Architecture written by Java ™ Software licensee, the MageLang Institute. A leading provider of Java technology training, MageLang has contributed regularly to the JDC since 1996.
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O MNI B ROKER is an Object Request Broker (ORB) that is compliant to the Common Object Request Broker Architecture (CORBA) specification, revision 2.0, as defined in [1] and [2] by the Object Management Group (OMG).
Some highlights of O MNI B ROKER
are:
Full CORBA IDL support
Complete CORBA IDL–to–C++ mapping
Complete CORBA IDL–to–Java mapping
Uses IIOP as native protocol
Dynamic Invocation Interface
Dynamic Skeleton Interface
Interface Repository
Peer–to–Peer communication with nested method invocations
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Reliable computer systems used in the telecommunication industry, in cars and automated factories (process control) are often implemented as special purpose systems which are vendor-specific, expensive, hard to maintain and difficult to upgrade. Often, those systems apply proprietary techniques to achieve security and predictable timing behavior, even in case of faults. With the need of integrating multiple of those control systems into a bigger whole, requirements arise to open up proprietary systems for standard (non real-time) distributed computing technology.
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Java Features • “Write Once, Run Anywhere.” • Portability is possible because of Java virtual machine technology: – Interpreted – JIT Compilers • Similar to C++, but “cleaner”: – No pointers, typedef, preprocessor, structs, unions, multiple inheritance, goto, operator overloading, automatic coercions, free. Java Subset for this Course • We will focus on a subset of the language that will allow us to develop a distributed application using CORBA. • Input and output will be character (terminal) based.
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