“ arthas是一个Java开源诊断神器。

今天分享一个非常重要的命令trace，官网定义这个方法的功能如下：方法内部调用路径，并输出方法路径上的每个节点上耗时 trace命令能主动搜索 class-pattern／method-pattern 对应的方法调用路径，渲染和统计整个调用链路上的所有性能开销和追踪调用链路。

trace一些高级用法也是离不开ognl语法支持，有兴趣的童鞋可以多去研究研究ognl的语法。trace对于lambda表达式支持不好。

效果展示

[arthas@71728]$ trace com.fun.frame.httpclient.FanLibrary getHttpResponse

Press Q or Ctrl+C to abort.

Affect(class-cnt:2 , method-cnt:1) cost in 107 ms.

`---ts=2020-05-16 14:38:18;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc

`---[49.749941ms] com.fun.frame.httpclient.FanLibrary:getHttpResponse()

+---[0.100454ms] com.fun.frame.httpclient.FanLibrary:isRightRequest() #322

+---[0.732549ms] com.fun.frame.httpclient.FanLibrary:beforeRequest() #323

+---[0.014092ms] com.alibaba.fastjson.JSONObject:() #324

+---[0.107529ms] com.fun.base.bean.RequestInfo:() #325

+---[0.014428ms] com.fun.utils.Time:getTimeStamp() #327

+---[39.088784ms] org.apache.http.impl.client.CloseableHttpClient:execute() #328

+---[0.007822ms] com.fun.utils.Time:getTimeStamp() #329

+---[0.027006ms] com.fun.frame.httpclient.FanLibrary:getStatus() #332

+---[0.037918ms] com.fun.frame.httpclient.FanLibrary:afterResponse() #333

+---[0.548651ms] com.fun.frame.httpclient.FanLibrary:getContent() #334

+---[1.198112ms] com.fun.frame.httpclient.FanLibrary:getJsonResponse() #336

+---[0.030268ms] com.alibaba.fastjson.JSONObject:putAll() #336

+---[0.010035ms] com.fun.frame.httpclient.FanLibrary:getMark() #340

+---[1.491255ms] com.fun.db.mysql.MySqlTest:saveApiTestDate() #340

+---[0.01706ms] org.apache.http.client.methods.CloseableHttpResponse:close() #342

`---[0.655007ms] com.fun.base.bean.RequestInfo:isBlack() #348

arthas命令trace追踪方法链路

代码

package com.fun

import com.alibaba.fastjson.JSONObject

import com.fun.frame.httpclient.FanLibrary

import org.apache.http.client.methods.HttpGet

class sd extends FanLibrary {

public static void main(String[] args) {

while (true) {

String url = "https://api.apiopen.top/getAllUrl"

HttpGet get = getHttpGet(url)

JSONObject response = getHttpResponse(get)

output(response)

output(test())

sleep(5000)

}

testOver()

}

static String test() {

sleep(1000)

for (int i = 0; i < 5; i++) {

getRandomInt(100)

}

ArrayList list = Arrays.asList(32, 432, 432, 423, 423, 32)

list.stream().forEach({x -> output(x)})

DEFAULT_STRING

}

}

其中gethttpresponse()方法代码：

/**

* 获取响应实体

*

会自动设置cookie，但是需要各个项目再自行实现cookie管理

*

该方法只会处理文本信息，对于文件处理可以调用两个过期的方法解决

*

* @param request 请求对象

* @return 返回json类型的对象

*/

public static JSONObject getHttpResponse(HttpRequestBase request) {

if (!isRightRequest(request)) RequestException.fail(request);

beforeRequest(request);

JSONObject res = new JSONObject();

RequestInfo requestInfo = new RequestInfo(request);

if (HEADER_KEY) output("===========request header===========", Arrays.asList(request.getAllHeaders()));

long start = Time.getTimeStamp();

try (CloseableHttpResponse response = ClientManage.httpsClient.execute(request)) {

long end = Time.getTimeStamp();

long elapsed_time = end - start;

if (HEADER_KEY) output("===========response header===========", Arrays.asList(response.getAllHeaders()));

int status = getStatus(response, res);

JSONObject setCookies = afterResponse(response);

String content = getContent(response);

int data_size = content.length();

res.putAll(getJsonResponse(content, setCookies));

int code = iBase == null ? -2 : iBase.checkCode(res, requestInfo);

if (iBase != null && !iBase.isRight(res))

new AlertOver("响应状态码错误：" + status, "状态码错误：" + status, requestInfo.getUrl(), requestInfo).sendSystemMessage();

MySqlTest.saveApiTestDate(requestInfo, data_size, elapsed_time, status, getMark(), code, LOCAL_IP, COMPUTER_USER_NAME);

if (SAVE_KEY) FunRequest.save(request, res);

} catch (Exception e) {

logger.warn("获取请求相应失败！", e);

if (!requestInfo.isBlack())

new AlertOver("接口请求失败", requestInfo.toString(), requestInfo.getUrl(), requestInfo).sendSystemMessage();

} finally {

HEADER_KEY = false;

if (!requestInfo.isBlack()) {

lastRequest = request;

}

}

return res;

}郑重声明：“FunTester”首发，欢迎关注交流，禁止第三方转载。更多原创文章：Fhaohaizi@163.com。

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