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The last topic I want to cover in
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this lesson is architectural styles. So, let's see
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what those architectural styles are. There are certain
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design choices that when applied in a given context
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regularly result in solutions with superior properties. What
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this means is that, compared to other possible alternatives,
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these solutions are more elegant, effective, efficient, dependable,
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evolve-able, scale-able, and so on. Architectural styles capture exactly
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these solutions. They capture idioms that we can
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use when designing a system. For a more formal
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definition, let's look how Mary Shaw and David Garlan
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define a architectural style. They say that an architectural
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style defines a family of systems in terms
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of a pattern of structural organization; a vocabulary of
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components and connectors and constraints on how these components
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and connectors can be combined. So in summary we
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can say that an architectural style is a named collection
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of architectural design decisions applicable in a given context. And I
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want to stress that it is important to study and
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know these architectural styles for several reasons. Because knowing them allows
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us to avoid reinventing the wheel. It also allows us
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to choose the right solution to a known problem and in
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some cases it even allows us to move on and
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discover even more advanced styles if we know the basic ones.
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So we should be familiar with architectural styles, what
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they are, and in which context they work, and
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in which context they do not work. So as
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to be able to apply them in the right situations.
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