Re: [Wrapper-user] Alternative to time as restart delay criteria?

[Leif M. <lei...@ta...>]

Dave,
Ok.  That should work.  The JVM itself will get restarted immediately,
but you can control when your application is actually started.

Let me know if we can help further.

Cheers,
Leif

On Wed, Sep 22, 2010 at 7:20 AM, Dave Muirhead <mui...@ya...> wrote:
> Hi Leif-
>
> Thanks for the info. Actually, I wasn't so much interested in the Wrapper
> itself being an mbean or using the JMX facilities within Java Service
> Wrapper. Rather, I was trying to figure out if there is some way to
> configure JSW (or my "wrapper.java.mainclass") so that some custom Java code
> (that I supply) can decide when/whether to actually continue with the
> re/start up  process - as opposed to "wrapper.restart.delay" being the
> deciding factor as to when/how soon a failed JVM is restarted.
>
> After some experimentation, I think the answer is the WrapperListener
> integration style. I wanted to defer re-start of a failed JVM until the
> value of an mbean (available from a remote mbean server in the environment)
> took on a particular value. I wrote a WrapperListener implementation whose
> start method does the following in a loop (until the mbean attribute takes
> on the required value): check the mbean attribute, call
> WrapperManager.signalStarting, call Thread.sleep. That seems to work fine
> and meets the need.
>
> Thanks for responding to my question.
>
> Best regards,
>
> Dave
>
> Message: 5
> Date: Wed, 22 Sep 2010 02:02:35 +0900
> From: Leif Mortenson <lei...@ta...>
> Subject: Re: [Wrapper-user] Alternative to time as restart delay
>     criteria?
> To: wra...@li...
> Message-ID:
>     <AAN...@ma...>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Dave,
> Currently, the Wrapper itself does not publish itself as a JMX bean.
> You are talking about delaying the launch of a JVM so any JMX access
> there would not be available as the JVM would be down.
>
> In addition to the fixed delay, we added a new "Paused" state to the
> JVM starting in version 3.5.0.  You will need to first enable pausing:
> http://wrapper.tanukisoftware.com/doc/english/prop-pausable.html
>
> You can use the Wrapper's command file to send PAUSE or RESUME
> commands to the Wrapper as it is running:
> http://wrapper.tanukisoftware.com/doc/english/prop-commandfile.html
>
> You can use the on exit properties to tell the Wrapper to pause when a JVM
> exits
> http://wrapper.tanukisoftware.com/doc/english/prop-on-exit-n.html
>
> There is not currently a way to tell the Wrapper to start paused.
>
> Please let me know how this works for you.
>
> Cheers,
> Leif
>
>
>
> On Tue, Sep 21, 2010 at 1:43 AM, Dave Muirhead <mui...@ya...> wrote:
>> The wrapper.restart.delay?"...controls the number of seconds to pause
>> between a JVM exiting for any reason, and a new JVM being launched."
>> But I wonder, is there any way to use criteria other than time to decide
>> when to relaunch? For example, is there a way to?configure JSW to?monitor
>> the value of a JMX MBean attribute and wait to restart the JVM until that
>> MBean attribute takes on a specific value?
>>
>> Thanks,
>>
>> Dave