Here's the interface I'm
overriding:
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/IAtom.java
And I'm using clojure 1.8.0.
Oh. Interesting. I was using cursive for compiling, but switched to boot.
Getting some interesting warnings now too:
WARNING: Bad method signature in protocol implementation, IDeref does not
declare method called deref at line 90 src\cljc\aautil\dewdrop.cljc
WARNING: Bad method signature in protocol implementation, IAtom does not
declare method called reset at line 90 src\cljc\aautil\dewdrop.cljc
WARNING: Bad method signature in protocol implementation, IAtom does not
declare method called swap at line 90 src\cljc\aautil\dewdrop.cljc
WARNING: Bad method signature in protocol implementation, IAtom does not
declare method called compareAndSet at line 90 src\cljc\aautil\dewdrop.cljc
clojure.lang.ExceptionInfo:
java.lang.IllegalArgumentException: Can't define method not in interfaces:
compareAndSet, compiling:(aautil/dewdrop.cljc:90:1)
data: {:file
"C:\\Users\\Bill\\AppData\\Local\\Temp\\boot.user1581043804101612299.clj",
:line 31}
java.util.concurrent.ExecutionException:
java.lang.IllegalArgumentException: Can't define method not in interfaces:
compareAndSet, compiling:(aautil/dewdrop.cljc:90:1)
So here's the whole thing:
(ns aautil.dewdrop
#?(:clj (:require [clojure.string :as str]
[clojure.edn :refer [read-string]])
:cljs (:require [clojure.string :as str]
[cljs.reader :refer [read-string]]))
#?(:clj (:refer-clojure :exclude [read-string]))
#?(:clj (:import (clojure.lang IDeref IAtom))))
(defn new-lens
"Create a new lens."
[getter setter]
{:getter getter :setter setter})
(defn lget
"Extract an item from some data.
Returns the extracted item."
[lens data]
((:getter lens) data))
(defn lderef
"Extract an item from data held by an atom.
Returns the extracted item."
[lens data-atom]
(lget lens @data-atom))
(defn lset!
"Revise some data with an item.
Returns the revised data."
[lens data item]
((:setter lens) data item))
(defn lreset!
"Revise some data held by an atom with an item.
Returns the revised data."
[lens data-atom item]
(reset! data-atom (lset! lens @data-atom item)))
(defn lupd!
"Update an item in some data.
Returns the revised data."
[lens data f]
(lset! lens data (f (lget lens data))))
(defn lswap!
"Update an item in some data held by an atom.
Returns the revised data."
[lens data-atom f]
(swap! data-atom
(fn [data]
(lupd! lens data f))))
(defn lcomp
"Combine a lens with another."
[left right]
{:getter
(fn [data] (lget left (lget right data)))
:setter
(fn [data item]
(let [right-data (lget right data)
left-data (lset! left right-data item)]
(lset! right data left-data)))})
(defn key-lens
"Builds a lens using get and assoc"
[key]
{:getter (fn [data] (get data key))
:setter (fn [data item] (assoc data key item))})
(defn atom-key-lens
"Builds a lens using get and assoc"
[key-atom]
{:getter (fn [data] (get data @key-atom))
:setter (fn [data item] (assoc data @key-atom item))})
;A lens built using read-string and pr-str.
(def edn-lens
{:getter read-string
:setter (fn [_ item] (pr-str item))})
(defn printing-lens
"A lens for debugging"
[id]
{:getter (fn [item]
(println id :got item)
item)
:setter (fn [data item]
(println id :set data item)
item)})
(defrecord lens-view [lens data-atom]
IDeref
(deref [this] (lderef lens data-atom))
IAtom
(reset [this item] (lreset! lens data-atom item))
(swap [this f] (lswap! lens data-atom f))
(swap [this f arg]
(swap! data-atom
(fn [data]
(lset! lens data (f (lget lens data) arg)))))
(swap [this f arg1 arg2]
(swap! data-atom
(fn [data]
(lset! lens data (f (lget lens data) arg1 arg2)))))
(swap [this f x y args]
(swap! data-atom
(fn [data]
(lset! lens data (apply f (lget lens data) x y args)))))
(^Boolean compareAndSet [oldv newv]
(swap! data-atom
(fn [data]
(let [v (lget lens data)]
(if (= oldv v)
(lset! lens data newv)
data)))))
)
(defn lview [lens data-atom]
(->lens-view lens data-atom))
On Wednesday, February 3, 2016 at 3:18:34 PM UTC-5, William la Forge wrote:
>
> Having a bit of a problem implementing the IAtom interface in a record.
> Specifically, this is the signature giving me grief:
>
> boolean compareAndSet(Object oldv, Object newv);
>
> This isn't the answer:
>
> (^boolean compareAndSet [oldv newv] ... )
>
>
> I get "Can't define method not in interfaces: compareAndSet".
>
> Any ideas? Thanks!
>
>
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