@Override
    public List<EngineConfigTuple<? extends IGatewayInitializer>> getGatewayInitializers(
            IPluginRegistry pluginRegistry) {
        // TODO support gateway initializers in vert.x
        return Collections.emptyList();
    }
@see io.apiman.gateway.engine.IEngineConfig#getGatewayInitializers(io.apiman.gateway.engine.IPluginRegistry)
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/common/config/VertxEngineConfig.java