[vbox-dev] ISession lock/unlock problems
Andrea Turli
andrea.turli at email.it
Thu Mar 29 09:37:15 GMT 2012
Thanks Klaus for your answer.
On Wed, Mar 28, 2012 at 6:07 PM, Klaus Espenlaub <klaus.espenlaub at oracle.com
> wrote:
> On 27.03.2012 20:54, Andrea Turli wrote:
>
>> So I'm trying to lauch/stop vm but also modify the vm definition.
>>
>> My question was
>> Is it possible that IMachine.getSessionState() and ISession.getState()
>> are not
>> always in sync?
>>
>
> Yes, that's possible. The IMachine one is more global (should be obvious
> from the scope/location of the corresponding object - IMachine is in
> VBoxSVC, and ISession is in the client), and thus if two sessions exist
> there may be significant differences, especially before/after associating
> the session with an IMachine instance.
Is there any other documentation where I can study more the relationship
between those two sessions, cause it is not totally clear to me.
>
>
> Is there a way to ensure that the ISession ::state is effectively
>> Unlocked before another methods tries to use it? Can I loop on the
>> ISession::state until the ISession is Unlocked for
>> all, and how?
>>
>
> No. If you write code which extrapolates the session state of other
> sessions from the "own" session you're simply doing something wrong. If
> there would be no difference between the methods we would have removed one
> of them.
>
I see your point, but what's then the suggested way to implement this kind
of scenario?
I lock and unlock a session to modify a machine
ISession session = vboxmanager.getSession();
machine.lockSession(session, LockType);
...
session.unlockMachine();
and immediately after that if I ask for
vboxmanager.findMachine(machineId);
I got exception cause the session is busy.
What's my error?
Thanks,
Andrea
>
> Klaus
>
>
>> Thanks,
>> Andrea
>>
>> On Tue, Mar 27, 2012 at 3:23 PM, Klaus Espenlaub
>> <klaus.espenlaub at oracle.com <mailto:klaus.espenlaub@**oracle.com<klaus.espenlaub at oracle.com>>>
>> wrote:
>>
>> On 25.03.2012 18:42, Andrea Turli wrote:
>> > Hi,
>> >
>> > I'm trying to implement a java client able to interact with Vbox
>> API.
>> >
>> > Reading the documentation I've found this document
>> >
>> https://www.virtualbox.org/**sdkref/interface_i_machine.**html#**
>> 5f6e112de89f7e1d300738c9a055d5**c9<https://www.virtualbox.org/sdkref/interface_i_machine.html#5f6e112de89f7e1d300738c9a055d5c9>
>> > where it is said explicity:
>> > "The caller must eventually release the session's shared lock by
>> > calling ISession::unlockMachine on the local session object once
>> this
>> > call has returned. However, the session's state (see
>> ISession::state)
>> > will not return to "Unlocked" until the remote session has also
>> > unlocked the machine (i.e. the machine has stopped running)."
>> >
>> > In fact IMachine.getSessionState() and ISession.getState() are not
>> > always in sync. Is there a way to ensure that the ISession ::state
>> is
>> > effectively Unlocked before another methods tries to use it?
>> > Can I loop on the ISession::state until the ISession is Unlocked for
>> > all, and how?
>>
>> What's the problem you're trying to solve? It's a bit difficult to
>> answer a question you didn't ask.
>>
>> Are you launching a VM, or are you trying to make changes to the
>> settings of a running VM? Quite different cases when it comes to
>> sessions.
>>
>> Klaus
>>
>> >
>> > Thank you,
>> > Andrea
>> >
>> >
>> > --
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>>
>>
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>> Dr. Klaus Espenlaub | Snr. Manager Software Development Desktop
>> Virtualization
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>
> --
> Oracle <http://www.oracle.com>
> Dr. Klaus Espenlaub | Snr. Manager Software Development Desktop
> Virtualization
> Phone: +49 7151 60405 205 <tel:+49715160405205>
> Oracle VM VirtualBox
>
> ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | 71384 Weinstadt
>
> ORACLE Deutschland B.V. & Co. KG
> Hauptverwaltung: Riesstr. 25, D-80992 München
> Registergericht: Amtsgericht München, HRA 95603
> Geschäftsführer: Jürgen Kunz
>
> Komplementärin: ORACLE Deutschland Verwaltung B.V.
> Hertogswetering 163/167, 3543 AS Utrecht, Niederlande
> Handelsregister der Handelskammer Midden-Niederlande, Nr. 30143697
> Geschäftsführer: Alexander van der Ven, Astrid Kepper, Val Maher
>
> Green Oracle <http://www.oracle.com/**commitment<http://www.oracle.com/commitment>>
> Oracle is committed to
> developing practices and products that help protect the environment
>
>
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