@Override
  public void initializeEventDispatcher() {
    if (logger.isDebugEnabled()) {
      logger.debug(" Creating the GatewayEventCallbackDispatcher");
    }
    dispatcher = new GatewaySenderEventCallbackDispatcher(this);

  }
Initialize the Executor that handles listener events. Only used by non-primary gateway senders
geode-core/src/main/java/org/apache/geode/internal/cache/wan/serial/SerialGatewaySenderEventProcessor.java