模拟StopWatch改写的一款耗时调试工具

本文主要是介绍模拟StopWatch改写的一款耗时调试工具，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

StopWatch在单个文件的单个方法中确时还蛮好用的，但跨多个文件，多个方法的同一线程内调试就有明显的不舒服。一是要建立ThreadLocal共享StopWatch的实例。二是StopWatch的start和stop必须形成闭合。在方法嵌套的场景。比如要查看大方法执行时间，还要查看大方法里面的某个调用的执行时间。这就没法做到了。3就是StopWatch以纳秒为单位，阅读不舒服（非高并发网站，没那么高的要求，毫秒即可），因此，做了这款调试工作。只记录线程某些栈节点的抵达时间。形成一个时间轴。最后打印这个时间轴的相邻时间差即可。调试中，只要确定费时的代码在哪个小区间，一般有经验的话能很快定位到问题代码。
效果如下图：

在这里插入图片描述
代码实现：
有需要的可以拿去美化下

public class RunnerAnalyzer {private final static ThreadLocal<List<RunnerInfo>> CONTAINER = new ThreadLocal<>();public static void start(String nodeName) {List<RunnerInfo> runnerInfos = CONTAINER.get();if (null == runnerInfos) {CONTAINER.set(new ArrayList<>());}List<RunnerInfo> container = CONTAINER.get();container.add(new RunnerInfo(nodeName));CONTAINER.set(container);}public static void clear() {CONTAINER.remove();}public static void prettyPrint(long moreThanTime) {RunnerAnalyzer.start("耗时记录结束");List<RunnerInfo> runnerInfos = CONTAINER.get();if (null == runnerInfos) {clear();return;}int size = runnerInfos.size();int lastIndex = size - 1;RunnerInfo first = runnerInfos.get(0);RunnerInfo last = runnerInfos.get(lastIndex);long totalTime = last.getTime() - first.getTime();// 只打印超过某一时间的，免得压力测试的时候疯狂刷if (totalTime < moreThanTime) {clear();return;}StringBuilder sb = new StringBuilder();sb.append("---------------------------------------------\n");String totalMessage = "总耗时" + totalTime + "\n";sb.append(totalMessage);String title = "抵达时间                    耗时       占比         节点名称\n";sb.append(title);for (int i = 0; i < size; i++) {RunnerInfo runnerInfo = runnerInfos.get(i);String showTimeName = runnerInfo.getShowTime() + "    ";sb.append(showTimeName);if (i != 0) {RunnerInfo lastNode = runnerInfos.get(i - 1);long lastNodeTime = lastNode.getTime();long during = runnerInfo.getTime() - lastNodeTime;String duringStr = during + "    ";sb.append(duringStr);String rate = ZYNumberUtils.rate(during, totalTime) + "    ";sb.append(rate);} else {sb.append("0    ");sb.append("    ");}String nodeName = runnerInfo.getNodeName() + "\n";sb.append(nodeName);}sb.append("---------------------------------------------\n");System.out.println(sb.toString());clear();}
}

public class RunnerInfo {private String nodeName;private long time;private String showTime;public RunnerInfo(String nodeName) {this.nodeName = nodeName;Date date = new Date();this.time = date.getTime();this.showTime = ZYDateUtils.formart(date, "yyyy-MM-dd HH:mm:ss:SSS");}
}