@Override
    public void registerAuthenticationMetadataPopulator(final AuthenticationMetaDataPopulator populator) {
        if (BeanSupplier.isNotProxy(populator)) {
            LOGGER.trace("Registering metadata populator [{}] into the execution plan", populator);
            authenticationMetaDataPopulatorList.add(populator);
        }
    }
This is {@link DefaultAuthenticationEventExecutionPlan}.

@author Misagh Moayyed
@since 5.1.0
core/cas-server-core-authentication-api/src/main/java/org/apereo/cas/authentication/DefaultAuthenticationEventExecutionPlan.java