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Other OSGi questions [message #23338]

Mon, 21 April 2003 19:08

Pascal Rapicault

Messages: 333
Registered: July 2009
Location: Ottawa

Senior Member

Hello,

Here some extra questions about OSGi:

- What happens if a bundle is leaving and the service it provides are not
unregistered?
It seems to me that the framework automatically "unregister" it, isn't
it?

- Bundle A is active and imports package foo, Bundle B exports package foo.
So A uses instances from B.
1st question - What happens if a Bundle C is being installed and exports
foo?
2nd question - What happens if B is being updated?

Thank you

PaScaL

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Re: Other OSGi questions [message #23426 is a reply to message #23338]

Thu, 24 April 2003 18:10

Keith Kimball

Messages: 22
Registered: July 2009

Junior Member

Pascal,

Based on my reading of the OSGi Release 3 Spec

>> What happens if a bundle is leaving and the service it provides are not
>> unregistered? It seems to me that the framework automatically
"unregister" it,
>> isn't it?

Section 4.8.7 (Stopping Bundles). The framework must automatically
unregister
all register services when the bundle is stopped.

>> Bundle A is active and imports package foo, Bundle B exports package
foo.
>> So A uses instances from B.
>> 1st question - What happens if a Bundle C is being installed and
exports foo?

Section 4.4 (The Bundle name-space). It's my understanding that if a
package is
exported by multiple bundles, the framework selects the package from one
of the
bundles. There's verbage pointing out than an "export" is an implicit
"import"
and even though a bundle exports a package, it may use a different
(potentially
lower version) of that package. Note also, packages can be used from a
bundle
without the bundle being activated.

>> 2nd question - What happens if B is being updated?

Section 4.8.9 (Updating Bundles). If an updated bundle had exported any
packages
that are used by other bundles, those packages may not be updated; their
old
versions remain exported until the xxx.refreshPackages method has been
called
or the Framework is restarted.

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Re: Other OSGi questions [message #23638 is a reply to message #23338]

Sat, 26 April 2003 14:27

Eclipse User

Originally posted by: Peter.Kriens.aQute.se

Pascal Rapicault wrote:

> - What happens if a bundle is leaving and the service it provides are not
> unregistered?
> It seems to me that the framework automatically "unregister" it, isn't
> it?

Yes. After the bundle's stop() method is called, the framework
automatically unregisters any remaining services.

> - Bundle A is active and imports package foo, Bundle B exports package foo.
> So A uses instances from B.
> 1st question - What happens if a Bundle C is being installed and exports
> foo?

The framework already has an import for foo so it will not do anything.

> 2nd question - What happens if B is being updated?

After update - nothing is changed. But normally after one or more
updates, refreshPackages() is called and this will resolve all
dependencies again. Depending on versions, C might be choosen or B
again. (Bundles that depend on this package, like A, will be restarted
in that case).

Kind regards,

Peter Kriens

>
> Thank you
>
> PaScaL
>
>
>

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