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Re: Graceful shutdown of WO apps + monitor + wotaskd
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Re: Graceful shutdown of WO apps + monitor + wotaskd


  • Subject: Re: Graceful shutdown of WO apps + monitor + wotaskd
  • From: Andrew Lindesay <email@hidden>
  • Date: Wed, 6 May 2009 14:07:13 +1200

Hello;

what is a "queue server's topic"

http://en.wikipedia.org/wiki/Java_Message_Service http://en.wikipedia.org/wiki/Observer_pattern

It is a mechanism by which a "message" (in my case, JSON-RPC over messaging) can be passed from either one instance to another instance (queue) or from one instance to the other instances in the deployment (topic).

What message?

Through this mechanism, the instances are able to periodically inform each other of their presence. An admin user can then opt (via a user interface) to send a message over the topic to trigger a shutdown procedure of one or more instances.


If you implemented such an arrangement, you could have your external system programatically send such a message into a topic and signal the instances to shutdown.

cheers.

___
Andrew Lindesay
www.lindesay.co.nz

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References: 
 >Graceful shutdown of WO apps + monitor + wotaskd (From: Greg Brown <email@hidden>)
 >Re: Graceful shutdown of WO apps + monitor + wotaskd (From: Andrew Lindesay <email@hidden>)
 >Re: Graceful shutdown of WO apps + monitor + wotaskd (From: "Mr. G Brown" <email@hidden>)

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