[jboss-as7-dev] Notification of shutdown commencing

[Brian Stansberry]

https://issues.jboss.org/browse/AS7-4492 is the JIRA for this. Scheduled 
for 7.2, as these "stopping" notifications are not critical to the 
specific use case that got me looking at this.

On 4/9/12 11:12 AM, David M. Lloyd wrote:
> More thinking leads me to this conclusion:  we add a container-stop
> operation; server shutdown still calls exit(); shutdown hook calls
> container-stop.  This way the container is always stopped, and the VM
> always shuts down in response to the shutdown operation.
>
> The only problem is that I'm not sure we'll be able to call operations
> during the execution of the shutdown operation.  We might have to just
> duplicate the handler code or something like that.
>
> On 04/09/2012 10:59 AM, Brian Stansberry wrote:
>> On 4/9/12 10:35 AM, David M. Lloyd wrote:
>>> I've added the requisite feature to MSC (see MSC-112) and am planning a
>>> 1.1.0.Beta1 release.
>>>
>>
>> Thanks.
>>
>>> One thing to consider is that currently the server shutdown op handler
>>> just calls System.exit().  So our order of operations is pretty much
>>> completely turned around at this point.  But I think that the op handler
>>> could simply be modified to shut down the service container.
>>>
>>
>> Yep. For this reason I hesitated a bit before saying +1 before, but I
>> think this approach is better than some alternative like adding another
>> method to the MSC TerminateListener (breaks impls) or adding another
>> redundant listener API to ServiceContainer.
>>
>>> On 04/09/2012 09:19 AM, Brian Stansberry wrote:
>>>> +1
>>>>
>>>> On 4/7/12 6:11 PM, Jason Greene wrote:
>>>>> Sounds good
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Apr 7, 2012, at 12:10 PM, "David M. Lloyd"<david.lloyd at redhat.com>      wrote:
>>>>>
>>>>>> On 04/06/2012 02:55 PM, Brian Stansberry wrote:
>>>>>>> I can't figure out a way to produce a notification of an impending
>>>>>>> server shutdown if a user does a soft kill of the server process.
>>>>>>>
>>>>>>> It's easy enough if shutdown is initiated by a management op; the op
>>>>>>> handler can trigger the notification. But a soft kill triggers a
>>>>>>> shutdown hook registered by the MSC ServiceContainer, and once that
>>>>>>> starts, services start stopping semi-randomly and its too late to notify
>>>>>>> anyone that that is going to start happening.
>>>>>>>
>>>>>>> The MSC shutdown stuff isn't exposed, so there's no way to tie into
>>>>>>> that. Adding another shutdown hook doesn't help as there's no
>>>>>>> predictable order of execution.
>>>>>>
>>>>>> Originally I had assumed (wrongly) at some level that AS 7 would be
>>>>>> completely service-oriented as 5 and 6 were.  The reality is that AS 7
>>>>>> is oriented around management, not services.  I still think that a
>>>>>> service-oriented VM is a valid use case for MSC, however I think that
>>>>>> this is not the case in AS 7.  So I think I should introduce an option
>>>>>> to disable the shutdown hook in MSC, and instead we should create one
>>>>>> for AS 7 which executes a shutdown management operation.
>>>>>>
>>>>>> WDYT?
>>>>>> --
>>>>>> - DML
>>>>>> _______________________________________________
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>>>>
>>>>
>>>
>>>
>>
>>
>
>


-- 
Brian Stansberry
Principal Software Engineer
JBoss by Red Hat