@Override
  public void preInitialize() {
    Set<String> allGatewaySenderIds = getAllGatewaySenderIds();
    allGatewaySenderIds.forEach(this::validateAsynchronousEventDispatcher);
  }
Validates that the GatewaySender/AsyncEventQueue referenced by the {@param asyncDispatcherId}
can be attached to this region; that is, verifies that the dispatcher is not configured as
parallel.

@param asyncDispatcherId Id of the AsynchronousEventDispatcher to validate.
geode-core/src/main/java/org/apache/geode/internal/cache/DistributedRegion.java