Re: [equinox-dev] Question on programatic close of the runtime

[Tim Diekmann <tdiekman@xxxxxxxxx>]

Hi,

while calling stop() on the system bundle is the correct and recommended approach, it is not always sufficient in production environments.

The framework will only end if the main() method that started it runs out or someone calls System.exit(). However, for the main method to end, all non-daemon threads have to be ended first. Bundles may have started non-daemon threads. If you have started Equinox with the console enabled that would be difficult and you continue to have a process lingering around and no OSGi framework.

System.exit() is the safest choice to ensure that the process has died.

Keep in mind that on shutdown Equinox is persisting its state and a call to System.exit() during that phase may cause cache corruption.

   Tim.

"It is a simple task to make things complex, but a complex task to make them simple."
 -- Fortune Cookie

On Mar 12, 2010, at 2:34 AM, Neil Bartlett wrote:

> Daniel,
> 
> Stopping bundle zero is not a hack; this is the normal way to
> programmatically shutdown OSGi. However:
> 
> 1) There is no need to check that the bundle is active first. Calling
> stop() on an already stopped bundle simply has no effect (likewise
> calling start() on an already active bundle has no effect).
> 
> 2) There should be no need to wait for the framework to stop and then
> call System.exit(). Exiting the JVM should be the responsibility of
> whoever created and started the framework, i.e. the launcher. Calling
> System.exit() directly from within a bundle will cause big problems if
> your bundle is deployed to a framework embedded in a larger system,
> e.g. an application server.
> 
> In other words, the code could be as simple as this:
> 
>    _componentContext.getBundleContext().getBundle(0).stop();
> 
> Regards,
> Neil
> 
> On Fri, Mar 12, 2010 at 10:16 AM,  <Daniel.Stucky@xxxxxxxxxxx> wrote:
>> Hi all,
>> 
>> 
>> 
>> I would like to expose the functionality to close the Equinox runtime via an
>> HTTP request. Therefore I have implemented a Jetty ContextHandler as an
>> DeclarativeService. I used the FrameworkCommandProvider as an example on how
>> to close the runtime, but I was not able to get access to the Framework
>> class to call method close() on it.
>> 
>> 
>> 
>> I came up with a workaround for that, which is basically like this:
>> 
>> 
>> 
>> Bundle bundle = _componentContext.getBundleContext().getBundle(0);
>> 
>> if (bundle.getState() == Bundle.ACTIVE) {
>> 
>> bundle.stop();
>> 
>>  while (bundle.getState() != Bundle.RESOLVED) {
>> 
>>                 // WAIT N milliseconds and REPEAT at most M times
>> 
>>  }
>> 
>> }
>> 
>>  System.exit(0);
>> 
>> 
>> 
>> 
>> 
>> This works fine for me, although it seems to be a hack stopping bundle with
>> Id 0. Are there better ways to achieve my goal ? Are there any ways to get
>> access to the Framework class ?
>> 
>> 
>> 
>> 
>> 
>> Bye,
>> 
>> Daniel
>> 
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>> 
>> 
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