Package com.opencloud.rhino.facilities.clusterstate

Interface ClusterStateChangeListener

  • public interface ClusterStateChangeListener

    Listener interface implemented by resource adaptors to receive cluster state change callbacks.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      void clusterStateChange​(int[] running, int[] joined, int[] left)
      Notification that the cluster has changed state with respect to the resource adaptor entity that attached the listener.

    • Method Detail

      • clusterStateChange

        void clusterStateChange​(int[] running,
                        int[] joined,
                        int[] left)

        Notification that the cluster has changed state with respect to the resource adaptor entity that attached the listener. This callback has slightly different semantics depending on whether the node is running in SAVANNA or POOL clustering mode as described below. In either case, the running set is a superset of the joined set and has an empty intersection with the left set.

        Rhino Savanna Clustering Mode A running node is a node that satisfies the following conditions:

        • the node is a member of the cluster’s primary component

        • the resource adaptor entity is in the Active state on the node

        • the SLEE has an actual state of Running on the node

        A resource adaptor entity will leave the running state on a node if the actual state of the resource adaptor entity or the SLEE transitions to Stopping on that node.

        Rhino Pool Clustering Mode A running node is a node that satisfies the following conditions:

        • the node is an OPERATIONAL live (or assumed live) member of the pool

        • the SLEE has an actual state of Running on the node

        A resource adaptor entity will leave the running state on a node if the actual state of the SLEE transitions to Stopping on that node. The actual state of the resource adaptor entity itself is ignored in pool mode.

        Parameters:
        running - the current set of cluster nodes where the resource adaptor entity is running
        joined - the set of nodes that previously did not satisfy the conditions required to be in the running set but now do
        left - the set of nodes that previously did satisfy the conditions required to be in the running set but now don’t