Why is a service-oriented architecture like the one proposed by SIRENA better than earlier approaches such as those based on CORBA?
CORBA and similar technologies, including Microsoft’s COM/DCOM, are designated as “distributed object” technologies, which define client-server relationships characterised by: · a purely synchronous interaction scheme based on remote procedure calls; · tight coupling between client-side and server-side processing, so that changes in the server-side implementation almost invariably necessitate modifications at the client side; · fine-grained, dialogue-style interactions, where each client call is interpreted according to the context created through previous calls. A central aspect of distributed object technology is the notion of object lifecycle: objects are instantiated by a factory upon request, a number of operations are performed on the object instance and some time later the instance is freed or garbage-collected. An object is identified through an object reference, which provides a unique mechanism to access the object. Objects often contain references to other objects, so that e
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