New proposal for #ReflectiveAccessToNonExportedTypes: Open modules & open packages

[Remi Forax]

----- Mail original -----
> De: "Andrew Dinn" <adinn at redhat.com>
> À: "John Rose" <john.r.rose at oracle.com>
> Cc: jigsaw-dev at openjdk.java.net
> Envoyé: Mercredi 2 Novembre 2016 14:25:01
> Objet: Re: New proposal for #ReflectiveAccessToNonExportedTypes: Open	modules & open packages

> On 02/11/16 01:58, John Rose wrote:
>> On Nov 1, 2016, at 12:02 PM, Andrew Dinn <adinn at redhat.com> wrote:
>>> 
>>> I did actually suggest a way of avoiding the use of Unsafe. You
>>> give your nominated module full reflective access to
>>> java.lang.invoke allowing it to create Lookup instances (it can
>>> actually just create a single all privileges lookup and use this to
>>> clone others). You don't need to insert a class into
>>> java.lang.invoke to do this. You simply add one exports directive
>>> on the command line.
>> 
>> The weak link in this otherwise robust scheme is the use of a command
>> line option to break into the jli package. Breaking in by the back
>> door is awkward and might not deliver the desired Lookup if jli code
>> changes. And it probably will, over time. Using the break-in is a
>> good Proof of concept but the finished product needs to use a real
>> API provided by the JDK, and using a wormhole Lookup actually
>> provided by a cooperating jli. I look forward to such a thing in a
>> future JDK.
> 
> Me too! But for now it's burglary or bust :-)
> 
>> Perhaps the right surface shape for moderate reflection is Maurizios
>> "reflection manifesto" API, which is completely interface driven.
>> This means a meta-CE with full deep access could mock up a
>> "reflection manifesto" implementation which would expose exactly the
>> right moderate surface area, as negotiated with the target module.
>> Just an idea…
> 
> Hmm, I have not seen said manifesto. Is it available somewhere public?

Maurizio talk about it at last JVM Language Summit
https://encrypted.google.com/search?hl=en&q=youtube%20Valhalla%20Reflection

The manifesto is here
http://cr.openjdk.java.net/~mcimadamore/reflection-manifesto.html

> 
> regards,
> 
> 
> Andrew Dinn

Rémi

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