@Override
  public List<InternalCacheServer> getCacheServersAndGatewayReceiver() {
    List<InternalCacheServer> allServers = new ArrayList<>(allCacheServers);

    InternalCacheServer receiverServer = gatewayReceiverServer.get();
    if (receiverServer != null) {
      allServers.add(receiverServer);
    }

    return unmodifiableList(allServers);
  }
For use by unit tests to inject a mocked ccpTimer
geode-core/src/main/java/org/apache/geode/internal/cache/GemFireCacheImpl.java