public void handleRegionLossEvent(SystemMemberRegionEvent event) {
    String memberId = event.getMemberId();
    SystemMemberJmx systemMemberJmx = (SystemMemberJmx) findCacheOrAppVmById(memberId);

    if (systemMemberJmx != null) {
      systemMemberJmx.handleRegionLoss(event);
    }
  }
Finds the member as per details in the given event object and passes on this event for handling
the region loss.

@param event event object corresponding to the loss of a region
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/AdminDistributedSystemJmxImpl.java