public class SingletonStore.SingletonStoreListener
Cache listener that reacts to cluster topology changes to find out whether a new coordinator is elected.
SingletonStore reacts to these changes in order to decide which cache should interact with the underlying cache
The cluster formation changed, so determine whether the current cache stopped being the coordinator or became
the coordinator. This method can lead to an optional in memory to cache loader state push, if the current cache
became the coordinator. This method will report any issues that could potentially arise from this push.