interface Foo{
Object foo(Object... args);
}
static class FooAdapter{
Object foo2(String msg, Integer age) {
System.out.println(msg+"=>"+age);
return age;
}
}
public static void main(String[] args) throws Exception{
FooAdapter adapter = new FooAdapter();
Foo foo = new ByteBuddy()
.subclass(Foo.class)
.method(ElementMatchers.named("foo"))
.intercept(MethodDelegation.to(adapter))
.make()
.load(ClassLoader.getSystemClassLoader())
.getLoaded()
.newInstance();
foo.foo("hello", 10);
}
My Code is simple, I just want Delegate My Foo interface foo
method call to FooAdater
instance foo2
method. But when i run test, ByteBuddy seems do nothing.
The delegation is succeeding because Byte Buddy decides that Object::equals
is the best method that can be bound to your adapter. It cannot bind the foo2
method, because it is expecting two arguments of type String
and Integer
while foo
only declares Object[]
.
The delegator you want to define is:
Object foo2(@Argument(0) Object[] arguments) {
System.out.println(arguments[0] + "=>" + arguments[1]);
return arguments[0];
}
where the argument is bound correctly. Otherwise, you might want to use the MethodCall
instrumentation where you can explode the array arguments. You need to use dynamic typing in this case as there is no way to prove that foo
is invoked with a string and an integer.
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