@Override
  public Set<GatewaySender> getGatewaySenders() {
    Set<GatewaySender> senders = new HashSet<>();
    for (GatewaySender sender : allGatewaySenders) {
      if (!((AbstractGatewaySender) sender).isForInternalUse()) {
        senders.add(sender);
      }
    }
    return senders;
  }
For use by unit tests to inject a mocked ccpTimer
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java