Page Comparison

...

@Scope("DOMAIN")
public class TheComponent ... {
 
   public void onEvent(Event event) {
      //...
   }
}

As explained in Lifecycle and Scopes, a clustered singleton instance is created on the zone leader. If the leader fails or otherwise becomes inactive, a new instance is created on the newly elected leader.

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• Timers that can only have a single emitter but must be highly-available (see Timer Components
• Consumers that listen on a remote channel bound to a transport such as JMS which can only have one instance active at a time