----- Mail original -----
> De: "Matej Novotny" <[email protected]>
> À: "Remi Forax" <[email protected]>
> Cc: "Alan Bateman" <[email protected]>, [email protected],
> "Tomas Remes" <[email protected]>, "Martin
> Kouba" <[email protected]>
> Envoyé: Mercredi 26 Avril 2017 16:04:08
> Objet: Re: setAccessible() alternative with Jigsaw - feedback on Lookup
>> You can spin one module per package, by creating one ModuleLayer per package,
>> not unlike j.l.r.Proxy does.
>
> Don't know a bit about it, but it sounds like a way worth exploring.
> Would you have a pointer towards some code showing how to deal with
> ModuleLayers?
>
> Also checking on j.l.r.Proxy, it uses the "good old" Unsafe.defineClass.
> Can't really see any module-related magic there.
snap, sorry, the code has changed since the last time i looked at it, or it was
another code ...
the recipe is:
1. create a module with ModuleDescriptor.Builder [1]
add the package you need with packages()
2. create an implementation of ModuleFinder [2] that only find that module
3. create a Configuration [3] like that resolve your module
ModuleLayer boot = ModuleLayer.boot();
Configuration cf = boot.configuration().resolve(finder, ModuleFinder.of(),
moduleName);
4. create a classloader
ClassLoader classLoader = new ClassLoader(parentClassLoader()) { /* make
defineClass more visible */};
5. create your own layer [4]
ModuleLayer layer = boot.defineModulesWithOneLoader(cf, classloader;
6. profit (i.e. now you can call define class on your classloader)
>
> Matej
Rémi
[1]
http://download.java.net/java/jdk9/docs/api/java/lang/module/ModuleDescriptor.Builder.html
[2]
http://download.java.net/java/jdk9/docs/api/java/lang/module/ModuleFinder.html
[3]
http://download.java.net/java/jdk9/docs/api/java/lang/module/Configuration.html#resolve-java.lang.module.ModuleFinder-java.lang.module.ModuleFinder-java.util.Collection-
[4]
http://download.java.net/java/jdk9/docs/api/java/lang/ModuleLayer.html#defineModulesWithOneLoader-java.lang.module.Configuration-java.lang.ClassLoader-
