1

我尝试使用gen-and-load-classfromclojure.core然后使用自定义类加载器来调用defineClass生成的字节码，但是当我调用

(foo.bar.MyClass.)

我越来越

CompilerExceptionjava.lang.NoClassDefFoundError: Could not initialize class foo.bar.MyClass

更新：

所以我按照@Elogent 的建议使用了 deftype ：

(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)))))

在 AOT 之后，javap Foo.class我得到：

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);
}

这正是我所需要的。谢谢@Elogent！

4

1 回答 1

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除非您绝对需要 Java 类的所有灵活性，否则我建议您deftype改用它。正如这里所解释的，deftype使您可以以惯用的方式访问较低级别的构造，例如原始类型和可变性。

于 2015-11-04T11:53:50.047 回答