@Override
    protected IPluginRegistry createPluginRegistry() {
        Class<? extends IPluginRegistry> c = engineConfig.getPluginRegistryClass();
        Map<String, String> config = engineConfig.getPluginRegistryConfig();

        return create(c, config);
    }
@see io.apiman.gateway.engine.impl.AbstractEngineFactory#createPluginRegistry()
gateway/engine/core/src/main/java/io/apiman/gateway/engine/impl/ConfigDrivenEngineFactory.java