I tried using proxy+ for one of the proxy implementations in clojure.core,
but I ran into an issue where a "too many matching methods" got thrown at
macroexpansion time. The proxy I tried to replicate was PrintWriter-on
<https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_print.clj#L559-L581>.
The exception-data contained two "write" methods that matched arity but
didn't match param types. Repro below.
(require '[com.rpl.proxy-plus :refer [proxy+]]))
(defn ^java.io.PrintWriter proxy+test
[flush-fn close-fn]
(let [sb (StringBuilder.)]
(-> (proxy+ []
java.io.Writer
(flush [this]
(when (pos? (.length sb))
(flush-fn (.toString sb)))
(.setLength sb 0))
(close [this]
(.flush this)
(when close-fn (close-fn))
nil)
(write [this ^chars str-cbuf off len]
(when (pos? len)
(.append sb str-cbuf ^int off ^int len))))
java.io.BufferedWriter.
java.io.PrintWriter.)))
On Monday, January 13, 2020 at 11:47:06 AM UTC-5, Nathan Marz wrote:
>
> proxy+ is a replacement for Clojure's proxy that's faster and more usable.
> proxy has a strange implementation where it overrides every possible method
> and uses a mutable field to store a map of string -> function for
> dispatching the methods. This causes it to be unable to handle methods with
> the same name but different arities.
>
> proxy+ fixes these issues with proxy. Usage is like reify, and it's up to
> 10x faster.
>
> *Repository: *https://github.com/redplanetlabs/proxy-plus
>
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