Re: [Wrapper-user] How To Pause A Service

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

Joos, Heather,
    I am working on it as we speak.  It will be in the 3.2.1 release.   
There are some major
changes to the state engine that are required so it is turning out to be 
a little more work than
I had expected.  I think I have everything worked out though.

    The Wrapper will allow 2 modes of operation.  The first will stop 
the JVM whenever
the service is paused.  This stoppage will reset the failed invocation 
count and allow
restarts from that state even if restarts have been disabled.  A special 
case.
    The second mode will keep the JVM running while paused.  But send an 
event to
the JVM so it can handle it.   If the JVM crashes for any reason while 
in this state,
it will stay down until the service is continued.  When continued, the 
exit will be
counted and handled as a regular restart.  If restarts are disabled or 
the restart count
exceeds the configured max, the wrapper will stop at that point.

    In either mode, the service can be stopped while paused.  If the JVM 
is running
at the time, it can initiate the stop.

    The WrapperListener class itself can not be modified to handle the 
pause/continue
events as the addition of such a method would break things for existing 
users.  I had
added a new event/listener hierarchy for 3.2.0 that is much more 
flexible.  This new
method allows you to handle this as follows:

WrapperManager.addWrapperEventListener( new WrapperEventListener() {
    public void fired( WrapperEvent event ) {
       if ( event instanceof WrapperServiceControlEvent ) {
          WrapperServiceControlEvent scEvent = 
(WrapperServiceControlEvent)event;
          switch ( scEvent.getServiceControlCode() ) {
          case WrapperManager.SERVICE_CONTROL_CODE_PAUSE:
             myPauseCallback();
             break;
          case WrapperManager.SERVICE_CONTROL_CODE_CONTINUE:
             myContinueCallback();
             break;
          }
       }
    }
}, WrapperEventListener.EVENT_FLAG_SERVICE );

You can write the above code in 3.2.0, but those event values will never 
be received
as things are implemented in that version.  I haven't compiled the 
above, so hopefully
there are no typos. :-)

Cheers,
Leif

Joost Jens wrote:
> I have asked this before. The service registers itself in such a way 
> that pausing is disabled. I have given a reason as to why I want it 
> enabled but they haven't responded on it yet.
> I made a workaround using a remote interface but that is not always 
> desirable I think.
>
> Joos
>
> Heather Leonard wrote:
>>
>> My appologies if this question is already in the archives (currently 
>> unavailable).
>>
>> I need to pause my service (Windows).  I wrote an implementation of 
>> the WrapperListener in order to be able to do this.  When I install 
>> the service and start it, the pause button is disabled in the 
>> Services window and the net pause command is not valid for the 
>> service.  I spent my day yesterday looking through documentation in 
>> order to find a solution but have been unable to find one so far.
>>
>> Any help you can give will be greatly appreciated.
>>
>> Thanks,
>> Heather
>>