Thanks Timo; Interesting links. Loving Clojure, but boy is it challenging the stuff I have been doing for the past how-ever many years :).
On 10 May 2013 20:14, Timo Mihaljov <t...@mihaljov.info> wrote: > 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/ > > -- > Timo > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "Clojure" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/clojure/keid7IGzKjk/unsubscribe?hl=en. > To unsubscribe from this group and all its topics, send an email to > clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
