Look at http://www.cocoonhive.org/articles/jboss/20030610/hasingleton.html
Marcus Redeker wrote:
All,
I am looking for a cluster aware scheduler service. The scenario is that I have two JBoss instances running in a cluster and I have a scheduler service running on one of them since it is fatal if my schedulable object would be invoked twice on both instances. But also I would like to have a failover which means that in case the instance which is running the scheduler service is going down I want another instance in the cluster to take over and activate the scheduler.
Is anything in that direction already available? From looking into the source I did not see anything. If not I would like to implement some kind of HASchedulerMBean. This could work the way that you would deploy your scheduler service with "StartAtStartup = false" and the HASchedulerMBean would invoke the start depending on which server is available in the cluster.
Sacha: Do you have a tip for me where to look in the clustering classes to get a head start?
Thanks,
--Marcus
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