blade create jvm delay
介绍
指定类方法调用延迟
参数
以下是此场景特有参数,通用参数详见:[blade create jvm](blade create jvm.md)
--effect-count string     影响的请求条数
--effect-percent string   影响的请求百分比
--time string             延迟时间,单位是毫秒,必填项
--offset string           延迟时间上下偏移量,比如 --time 3000 --offset 1000,则延迟时间范围是 2000-4000 毫秒案例
业务方法通过 future 获取返回值,代码如下:
@RequestMapping(value = "async")
@ResponseBody
public String asyncHello(final String name, long timeout) {
    if (timeout == 0) {
        timeout = 3000;
    }
    try {
        FutureTask futureTask = new FutureTask(new Callable() {
            @Override
            public Object call() throws Exception {
                return sayHello(name);
            }
        });
        new Thread(futureTask).start();
        return (String)futureTask.get(timeout, TimeUnit.MILLISECONDS);
    } catch (TimeoutException e) {
        return "timeout, " + e.getMessage() + "\n";
    } catch (Exception e) {
        return e.getMessage() + "\n";
    }
}我们对 sayHello 方法调用注入 4 秒延迟故障,futureTask.get(2000, TimeUnit.MILLISECONDS) 会发生超时返回:
blade c jvm delay --time 4000 --classname=com.example.controller.DubboController --methodname=sayHello --process tomcat
{"code":200,"success":true,"result":"d6ebea0dc28b6ab3"}注入故障前: 
注入故障后: 
停止实验:
blade d d6ebea0dc28b6ab3常见问题
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