1
我曾嘗試使用gen-and-load-class
從clojure.core
,然後使用自定義類加載器調用defineClass
與生成的字節碼,但是當我打電話我如何用Clojure在運行時定義一個Java類,並創建實例
(foo.bar.MyClass.)
我「M越來越
CompilerExceptionjava.lang.NoClassDefFoundError: Could not initialize class foo.bar.MyClass
UPDATE:
所以我用DEFTYPE通過@Elogent的建議:
(defprotocol Struct
(getX [this path] "Get value")
(setX [this ^long value path] "Get value"))
(deftype Foo
[
^{:tag long :unsynchronized-mutable true} a
^{:tag long :unsynchronized-mutable true} b
^{:tag long :unsynchronized-mutable true} c]
Struct
(getX
[this [head & tail]]
(let [field (condp = head
'a a
'b b
'c c)]
(if (empty? tail)
field
(getX field tail))))
(setX
[this value [head & tail]]
(if (empty? tail)
(condp = head
(set! a (long value))
(set! b (long value))
(set! c (long value)))
(condp = head
(setX a value tail)
(setX b value tail)
(setX c value tail)))))
AOT後,當我做javap Foo.class
我:
public final class struct.core.Foo implements struct.core.Struct,clojure.lang.IType {
public static final clojure.lang.Var const__0;
public static final java.lang.Object const__1;
public static final clojure.lang.Var const__2;
public static final java.lang.Object const__3;
public static final clojure.lang.Var const__4;
public static final clojure.lang.AFn const__5;
public static final clojure.lang.AFn const__6;
public static final clojure.lang.AFn const__7;
public static final clojure.lang.Var const__8;
public static final clojure.lang.Var const__9;
public static final clojure.lang.Var const__10;
public static final clojure.lang.Var const__11;
public static final clojure.lang.Var const__12;
long a;
long b;
long c;
public static {};
public struct.core.Foo(long, long, long);
public static clojure.lang.IPersistentVector getBasis();
public java.lang.Object setX(java.lang.Object, java.lang.Object);
public java.lang.Object getX(java.lang.Object);
}
這正是我需要的。謝謝@Elogent!
你試圖解決什麼問題?換句話說,你需要這個你定義的Java類的目的是什麼? –
我正在構建原型,允許構建簡潔的功能和緩存不經意的數據結構。爲此,我需要構建等效的C strict,模型數據結構作爲數組,而不使用引用等。 – Lambder
爲什麼?在這種情況下['defrecord'](http://clojuredocs.org/clojure.core/defrecord)或['deftype'](http://clojuredocs.org/clojure.core/deftype)有什麼問題? –