Re: [equinox-dev] Should OSGi bundles always export all packages?

[Lars Vogel <lars.vogel@xxxxxxxxxxx>]

Thanks BJ for your advice. Your explanation was also my understanding
(see bug discussion) but we had different opinions in the team, hence
the request to the OSGi experts.

Also thanks to Neil for answering in the bug.



On Mon, Dec 2, 2019 at 4:49 PM BJ Hargrave <hargrave@xxxxxxxxxx> wrote:
>
> That advice is too broad. A bundle should export the package which are its API. That is, the packages which users of the bundle need access to in order to use the bundle. Packages which are implementation detail should not be exported to properly encapsulate implementation detail. Some bundles will export no packages since they are pure implementation. Some bundle are pure API and thus will export all packages. But it is not true that all bundles should export all packages.
>
> If every bundle exports all packages, then where is any modularity and encapsulation of implementation detail?
> --
>
> BJ Hargrave
> Senior Technical Staff Member, IBM // office: +1 386 848 1781
> OSGi Fellow and CTO of the OSGi Alliance // mobile: +1 386 848 3788
> hargrave@xxxxxxxxxx
>
>
>
> ----- Original message -----
> From: Lars Vogel <lars.vogel@xxxxxxxxxxx>
> Sent by: equinox-dev-bounces@xxxxxxxxxxx
> To: Equinox development mailing list <equinox-dev@xxxxxxxxxxx>
> Cc:
> Subject: [EXTERNAL] [equinox-dev] Should OSGi bundles always export all packages?
> Date: Mon, Dec 2, 2019 10:31
>
> Hi OSGi experts,
>
> In one of the Eclipse releases a warning was activated that a plugin
> must  exports all its packages. It is possible to change this for a
> workspace but IMHO this new default is wrong.
>
> Plug-ins should not always export all packages as IMHO this defies the
> purpose of a good module system. Internal stuff should be hidden.
>
> Can you clarify what the OSGi recommended way is? See
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=544977
>
> Best regards, Lars
>
> --
> Eclipse Platform project co-lead
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-- 
Eclipse Platform project co-lead
CEO vogella GmbH

Haindaalwisch 17a, 22395 Hamburg
Amtsgericht Hamburg: HRB 127058
Geschäftsführer: Lars Vogel, Jennifer Nerlich de Vogel
USt-IdNr.: DE284122352
Fax (040) 5247 6322, Email: lars.vogel@xxxxxxxxxxx, Web: http://www.vogella.com