there is no foo/x unless you defined one - the protocol function is
created by defprotocol and is not owned by the object implementing the
protocol
On Thu, Nov 21, 2019 at 3:29 PM Dimitrios Jim Piliouras
<jimpil1...@gmail.com> wrote:
>
> But the call-chain is api/x-with-foo => foo/x => proto/X so it does bottom
> out in the ns the protocol was defined in. It's just that the middle step
> could come from 3 different namespaces all containing protocol extensions.
>
> On Thu, 21 Nov 2019, 23:03 Justin Smith, <noisesm...@gmail.com> wrote:
>>
>> it might be helpful to consider that in the jvm methods are not data,
>> and the proto function makes the method into concrete data belongs to
>> the namespace that owns the protocol
>>
>> On Thu, Nov 21, 2019 at 2:58 PM Justin Smith <noisesm...@gmail.com> wrote:
>> >
>> > if you define proto method x, it belongs to the protocol namespace no
>> > matter where it is called, and calling it as if it belonged to the
>> > namespace defining the object extending the protocol will and should
>> > fail
>> >
>> > On Thu, Nov 21, 2019 at 1:57 PM Dimitrios Jim Piliouras
>> > <jimpil1...@gmail.com> wrote:
>> > >
>> > > Hi folks,
>> > >
>> > > This has me completely stumped - I would massively appreciate a helping
>> > > hand! Suppose the following simple directory structure:
>> > >
>> > >
>> > > — someProject.impl.{foo.clj, bar.clj,baz.clj}
>> > > — someProject.proto.clj
>> > > — someProject.api.clj
>> > >
>> > > `proto.clj` contains a single protocol with two methods - let’s call
>> > > them X & Y. Each implementation namespace (foo, bar, baz), requires
>> > > `[someProject.proto :as proto]`, extends it to 3 types
>> > > (bytes/chars/String), and defines two public fns x & y which delegate to
>> > > `proto/X` & `proto/Y` respectively. Everything is good so far. I can
>> > > fire up a REPL, load any of the impl namespaces (foo, bar, baz), call
>> > > the corresponding x or y fn and get the right result.
>> > >
>> > > Now, I want to provide a unified API so that the caller doesn’t need to
>> > > (potentially) require 3 namespaces. Hence the `someProject.api` ns,
>> > > which contains require clauses for all impl namespaces + two
>> > > multi-methods `X-with` & `Y-with` with 3 implementations (`defmethod`)
>> > > each. Each implementation delegates to the x or y fn in the right impl
>> > > namespace. In other words, `X-with :foo` calls `(foo/x)`, `X-with :bar`
>> > > calls `(bar/x)` etc etc. Remember, that calling x or y inside any impl
>> > > namespace works correctly, so all I’m doing here is providing a
>> > > multi-method wrapper. However, things don’t work as I was expecting in
>> > > this namespace…Loading `someProject.api` in a fresh REPL and calling
>> > > `X-with :foo` bottoms out at the protocol extension for X in the baz ns,
>> > > which is the last require clause in the api namespace.
>> > >
>> > > So basically, the protocol extensions in each impl namespace work fine
>> > > when called from their wrapper fn in the namespace they were defined,
>> > > but don’t quite work when the same wrapper fn is called from some other
>> > > namespace! What am I missing? :(
>> > >
>> > > Many thanks in advance…
>> > > Dimitris
>> > >
>> > >
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