EAN: 9780262045490

SOFTWARE DESIGN FOR FLEXIBILITY - CHRIS HANSON ...

Strategies for building large systems that can be easily adapted for new situations with only
minor programming modifications. Time pressures encourage programmers to write code that works
well for a narrow purpose  with no room to grow. But the best systems are evolvable  they can
be adapted for new situations by adding code  rather than changing the existing code. The
authors describe techniques they have found effective--over their combined 100-plus years of
programming experience--that will help programmers avoid programming themselves into corners.
The authors explore ways to enhance flexibility by: • Organizing systems using combinators to
compose mix-and-match parts  ranging from small functions to whole arithmetics  with
standardized interfaces • Augmenting data with independent annotation layers  such as units of
measurement or provenance • Combining independent pieces of partial information using
unification or propagation • Separating control structure from problem domain with domain
models  rule systems and pattern matching  propagation  and dependency-directed backtracking •
Extending the programming language  using dynamically extensible evaluators

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