A.6. The Myth of “Quality of Service”
One could take the position that the way an object deals with latency, memory access, partial failure, and concurrency control is really an aspect of the implementation of that object, and is best described as part of the “quality of service” provided by that implementation. Different implementations of an interface may provide different levels of reliability, scalability, or performance. If one wants to build a more reliable system, one merely needs to choose more reliable implementations of the interfaces making up the system.
On the surface, this seems quite reasonable. If I want a more robust system, I go to my catalog of component vendors. I quiz them about their test methods. I see if they have ISO9000 ...
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