On 04/12/18 10:40, Alan Bateman wrote:
On 11/04/2018 21:07, Rafael Winterhalter wrote:
I do not think that this is possible. If the module containing the
interface does not open a package, I cannot change the privileges of
the main module such that I can resolve a method handle for invoking
the special invocation.
I just tried this out too and I did not find a way, could you suggest
how to change my code for being able to do so?
If the interface is public in an exported package (no need for the
package to be open) then the proxy will be generated into the unnamed
module. So easy to get a Lookup to the proxy class and you can use
this as the special caller. Can you change your invocation handler to
the following and try it:
Class<?> proxyClass = proxy.getClass();
Main.class.getModule().addReads(proxyClass.getModule());
Lookup lookup = MethodHandles.privateLookupIn(proxyClass,
MethodHandles.lookup());
MethodType mt = MethodType.methodType(String.class);
return lookup.findSpecial(iface, "foo", mt,
proxyClass).bindTo(proxy).invokeWithArguments();
-Alan
This works logically, but performance wise I would 1st create a proxy
class, lookup the direct method handles I want to invoke, transform them
to take Object 'proxy' instance as 1st argument and the rest of
arguments as an Object[] and return an Object. I would cache the
resulting MHs in the specific (constant if possible) InvocationHandler.
Each invocation would then only select the right cached MH as quickly as
possible and do return mh.invokeExact(proxy, args);
Peter
