Evaluating High-Level Distributed Language Constructs

The paper investigates the impact of high level distributed programming language constructs on the engineering of realistic software components. Based on reengineering two non-trivial telecoms components, we compare two high-level distributed functional languages, ERLANG, and GdH, with conventional distributed technologies C++/CORBA and C++/UDP. We investigate several aspects of high-level distributed languages including the impact on code size of high-level constructs. We identify three language constructs that primarily contribute to the reduction in application size and quantify their impact. We provide the first evidence based on analysis of a substantial system to support the widely-held supposition that high-level constructs reduce programming effort associated with specifying distributed coordination. We investigate whether a language with sophisticated high-level fault tolerance can produce suitably robust components, and both measure and analyse the additional programming effort needed to introduce robustness. Finally, we investigate some implications of a range of type systems for engineering distributed software.