在Freemarker中有等待/睡眠功能吗？

import freemarker.core.Environment;
import freemarker.template.*;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class SleepDirective implements TemplateDirectiveModel {

    @Override
    public void execute(Environment env, @SuppressWarnings("rawtypes") 
                       java.util.Map params, TemplateModel[] loopVars,
                       TemplateDirectiveBody body) throws TemplateException, IOException {
        try {
            // 获取等待时间参数
            TemplateModel waitTimeModel = (TemplateModel) params.get("waitTime");
            if (waitTimeModel instanceof TemplateNumberModel) {
                long waitTime = ((TemplateNumberModel) waitTimeModel).getAsNumber().longValue();
                // 等待指定的时间
                TimeUnit.MILLISECONDS.sleep(waitTime);
            }
        } catch (InterruptedException e) {
            // 处理中断异常
            throw new TemplateException("Sleep interrupted", env);
        }
    }
}

Configuration cfg = new Configuration(Configuration.VERSION_2_3_31);
// 注册自定义指令
cfg.setSharedVariable("sleep", new SleepDirective());

<@sleep waitTime=1000/>