Qualified exports/opens and services

[Nicolai Parlog]

 Hi Alan, David,

thanks for your replies, both are very helpful! :)

 so long ... Nicolai



On 04.01.2018 16:06, Alan Bateman wrote:
> On 04/01/2018 14:25, David Lloyd wrote:
>> : Hi Nicolai,
>> 
>> You may want to refer to the thread here: 
>> http://mail.openjdk.java.net/pipermail/jigsaw-dev//2017-November/013315.html
>>
>>
>>
>> 
Essentially a module may delegate a private Lookup to itself, or a
>> module may do so on behalf of another module.  To use your
>> example, the module called "jpa" would have to internally create
>> a private Lookup on "com.example.dto" and hand it over to the
>> "hibernate" module, which would then be able to use it to reflect
>> on private members of "com.example.dto".
> I suspect Nicolai is looking for Module addOpens:
> 
> "API Note: This method can be used for cases where a consumer
> module uses a qualified opens to open a package to an API module
> but where the reflective access to the members of classes in the
> consumer module is delegated to code in another module. Code in the
> API module can use this method to open the package in the consumer
> module to the other module."
> 
> but you are right that using Lookup objects would work well here.
> No need to open any package, instead have the consumer module pass
> a Lookup object as a capability to the framework, the framework
> passes to the trusted service provider.
> 
>> 
>> That said, the java.lang.invoke.MethodHandles#privateLookupIn()
>> method leaves a little to be desired as it requires a class from
>> the target module; it would be nice if there was a variant which
>> accepted a Module...
> There wouldn't be a lookup class in that case so it would be a
> different kinda of lookup object.
> 
> -Alan
> 

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