Core J2EE Patterns Best Practices And Design Strategies

In the world of software, a pattern is a tangible manifestation of an
organization’s tribal memory. A pattern provides a common solution
to a common problem and so, within the culture of one specific
organization or within one domain, naming and then specifying a
pattern represents the codification of a common solution, drawn from
proven, prior experience. Having a good language of patterns at your
disposal is like having an extended team of experts sitting at your side
during development: by applying one of their patterns, you in effect
take the benefit of their hard-won knowledge. As such, the best
patterns are not so much invented as they are discovered and then
harvested from existing, successful systems. Thus, at its most mature
state, a pattern is full of things that work, absent of things that don’t
work, and revealing of the wisdom and rationale of its designers.
Deep, really useful, patterns are typically ancient: you see one and
will often remark, “Hey, I’ve done that before.” However, the very
naming of the pattern gives you a vocabulary that you didn’t have
previously and so helps you apply that pattern in ways you otherwise
might have not have realized. Ultimately, the effect of such a pattern
will be to make your system simpler.
Patterns not only help you build simpler systems that work, but they
also help you build beautiful programs. In a culture of time starvation,
writing beautiful software is often impossible. That’s sad, for as
professionals, we strive to build things of quality. By applying a good
set of patterns, it is possible to bring a degree of elegance in to your
systems that might otherwise have been lacking.

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