private boolean hasSerialSenders(InternalRegion region) {
    boolean hasSenders = false;
    Set<String> senders = region.getAllGatewaySenderIds();
    for (String sender : senders) {
      GatewaySender gatewaySender = getGatewaySender(sender);
      if (gatewaySender != null && !gatewaySender.isParallel()) {
        hasSenders = true;
        break;
      }
    }
    return hasSenders;
  }
For use by unit tests to inject a mocked ccpTimer
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java