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arthas命令ognl中提到的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:<init>() #324
+---[0.107529ms] com.fun.base.bean.RequestInfo:<init>() #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
* <p>会自动设置cookie，但是需要各个项目再自行实现cookie管理</p>
* <p>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</p>
*
* @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;
}
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