Thanks for the explanation. Yes, it makes sense. Without this library I would do something similar myself. You are using deref (pragmatic clojure) and the relationship is explicit (in system map), both are advantages.
It is possible to design around it though; separate the common parts, say the container of webservices in your first example (as :c) and then make both :a and :b depend on :c, and :b to depend on :a too for instance. A component doesn't have to be immutable, or has to be initialized all at once (during start). I imagine it can have other life-cycle event and change its state. Anyways I see myself as a potential user of your library. I'm just sharing my thoughts. On Tue, Dec 2, 2014 at 8:33 PM, JUAN ANTONIO Ruz <juanantonio...@gmail.com> wrote: > Hi Atamert, > I realised too the discouraged note > <https://github.com/stuartsierra/component#disadvantages-of-the-component-model> > about cyclic dependencies but although your closed "parent->child" > component relations is logically perfect on start your system, when system > "is ready to work" it's very useful to open the door to "child->parent" > relation too, so the "child" component can communicate with "parent" > component. > Here a couple of examples that you could find this reverse relation: > * routing (router and webservices). webservice could need to know which > other webservices are connected to its "parent" router to construct urls ( > modular/bidi <https://github.com/juxt/modular/tree/master/modules/bidi>) > * templating (menu and menu-items). Menu-items could need to know which > others menu-items are used/displayed on the menu component to adapt their > renderer > > Does this explanation make sense to you? > > Thanks for reviewing > Juan > > El martes, 2 de diciembre de 2014 12:55:42 UTC+1, Atamert Ölçgen escribió: >> >> Hi Juan, >> >> I thought co-dependencies ought to be designed out. Could you give a use >> case for co-dependency? >> >> >> On Tue, Dec 2, 2014 at 7:16 PM, JUAN ANTONIO Ruz <juanant...@gmail.com> >> wrote: >> >>> *co-dependency* is a library that lets you use "*cyclic*" dependencies in >>> stuartsierra/component systems >>> >>> In other words, :a depends-on :b, :b (co-)depends-on :a >>> >>> Although I used "cyclic" word, this co-dependency library is designed on >>> the idea that components don't need co-dependencies to start as normal >>> dependencies. >>> >>> co-dependency follows the pattern described in stuartsierra/component# >>> customization <https://github.com/stuartsierra/component#customization> to >>> accomplish this "cyclic" feature >>> >>> You can find all the details about this lib on https://github.com/ >>> tangrammer/co-dependency >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@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+u...@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+u...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Kind Regards, >> Atamert Ölçgen >> >> -+- >> --+ >> +++ >> >> www.muhuk.com >> > -- > 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/d/optout. > -- Kind Regards, Atamert Ölçgen -+- --+ +++ www.muhuk.com -- 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/d/optout.
