Clojurians Log v2
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mafcocinco 2024-04-20T14:48:46.848449Z
Question about clojure.tools.namespace . In past projects, I have used ns-tracker to reload namespaces on a locally running server. This worked well but I would like to transition to tools.namespace as it seems to be more robust in its handling of dependencies and namespace reloading. However, tools.namespace.repl/refresh does not work when I run it in a separate thread, which makes it challenging to use in combination with ns-tracker. The specific error I receive is this:
Exception in thread "Thread-0" java.lang.IllegalStateException: Can't change/establish root binding of: *ns* with setns-tracker. Primarily, I would like to know what the proper way to do hot reloading of server code (running on a local machine) with clojure.tools.namespace?
vemv 2024-04-20T14:59:18.439139Z
It's more idiomatic to stop using ns-tracker and use t.n in conjunction with Component to also manage your local server or other such 'components'
vemv 2024-04-20T14:59:59.272449Z
Here's a nice template https://github.com/stuartsierra/reloaded (even if you weren't using Lein, you can just peek at the files)
mafcocinco 2024-04-20T15:00:24.538189Z
We are using polylith but I’m sure we can modify to make it work.
vemv 2024-04-20T15:00:57.538339Z
You can use poly with Component, or Integrant. t.n plays well with both
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vemv 2024-04-20T15:01:40.341209Z
Lastly, generally, don't do any sort of code (re)loading from a parallel thread - require and friends are thread-unsafe, as of today
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mafcocinco 2024-04-20T15:05:03.076569Z
So is it best practice now to just move off of ns-tracker?
vemv 2024-04-20T15:06:33.744109Z
I'd say it's a pretty old-school tool, very rare to see
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vemv 2024-04-20T15:07:33.498939Z
https://github.com/tonsky/clj-reload aspires to be tools.namespace's successor , I'd say it's doing a good job at that and it already has CIDER support (personally I keep using t.n but I'm a cranky dev)
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