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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