@Override
    public void quorumLost(Set<InternalDistributedMember> failures,
        List<InternalDistributedMember> remaining) {
      dm.handleQuorumLost(failures, remaining);
    }
This is the listener implementation for responding from events from the Membership Manager.
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java