On 10.05.2013 14:04, Colin Yates wrote:
> 2) to provide a 'get-ds' accessor which returns a new instance and rely
> on passing that service along to every function that needs it?
For what it's worth, some people in the OO community, most notably Nat
Pryce and Steve Freeman of Growing Object-Oriented Software[1] fame,
advocate[2][3] this approach over using an IoC container.
> Option 2 means functions are still pure, but how do you prevent huge
> lists of services - i.e. if func-a calls func-b which calls func-c and
> func-c needs service-a then func-a and func-b need to access service-a.
> Yuck. It also means the main entry point to my application needs to
> assemble all of these services up in one go.
Here's the punchline from [3]:
If I later find that I can’t get access to some component that I
think I need, that’s not necessarily a bad thing. It’s telling me
that I’m introducing a new dependency and sometimes that’s a hint
that a component is in the wrong place, or that I’m trying to use
it from the wrong place. The coding bump is a design feedback
mechanism that I miss when I can just pull objects out of a
container. If I do a good job, I should find that, most of the
time, I have just the right components at the time that I need
them.
[1] http://www.growing-object-oriented-software.com/
[2] http://www.natpryce.com/articles/000783.html
[3]
http://www.higherorderlogic.com/2011/07/is-dependency-injection-like-facebook/
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Timo
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