[jboss-user] [Beginner's Corner] - Re: Clustering an application that uses Spring singletons

[Alessandro Novarini]

Alessandro Novarini [http://community.jboss.org/people/a.novarini] created the discussion

"Re: Clustering an application that uses Spring singletons"

To view the discussion, visit: http://community.jboss.org/message/574077#574077

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Just to tell you how the developers decided to solve this "issue".

Basically, the injected singleton became a service, so singleton on every node, with a dependency to the HASingletonDeployer, just like the following:

@Service(objectName="jboss.myApp:service=myService")
@Depends("jboss.ha:service=HASingletonDeployer,type=Barrier")


In this way the bean will be deployed just once for all the cluster instances.
>From now on, for referencing your bean, you can use the Depends annotation on the field:

@Depends("jboss.myApp:service=myService")
private MyService myService;


In our scenario, since the data are loaded once in a day and put into the cache, we're fine even if we experience same gap before the service starts again on another node.

Thanks
Ale
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