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所有的框架源码,最怕的就是被debug

所有的框架源码,最怕的就是被debug

知乎上有个问题:学编程是理解就行呢还是全部背?

我的观点是:我是建议用debug的思维去做这个事情,并且写一些小的demo验证它。

我之前在知乎写过一篇回答,redis 为什么是单线程的?

  • • https://www.zhihu.com/answer/1992725787892277977

我才不管的它是C语言,D语言,xxx语言写的。我想搞清楚它,那我就debug它,直接把整个redis在我的window11上运行起来。

所有的问题,最怕的就是被debug。

我就是想知道redis单线程是怎么回事,就算它是C语言实现的,照样debug。

所有的问题,最怕的就是被debug。

不管是Tomcat的请求处理流程,还是Spring Boot的自动装配机制,还是MyBatis的SQL执行链路,你只要肯在关键位置打个断点跑一遍,debug它,它就没有秘密可言。

况且现在AI这么强大,你甚至可以问,在哪个类的哪个方法设置断点,是最合适的。然后设置个断点。

写小demo验证

Thinking in Java这本书,它伟大的地方在于它总是能用极短的代码把一个语言特性暴露出来。你看完那几行demo,那个特性就理解了。

这个方法我们自己也可以用。

想搞清楚Spring的循环依赖是怎么解决的?写3个类,A注入B,B注入C,C注入A,跑起来,debug进DefaultSingletonBeanRegistrygetSingleton方法。

想搞清楚线程池的拒绝策略到底什么时候触发?写个demo:

// 核心线程2个,最大线程3个,队列容量1个
ThreadPoolExecutor
 pool = new ThreadPoolExecutor(
    2
, 3, 60, TimeUnit.SECONDS,
    new
 ArrayBlockingQueue<>(1));

往里面提交5个任务,第5个就会触发拒绝策略。不需要背什么「核心线程满了放队列,队列满了开新线程,最大线程也满了才拒绝」,跑一次demo,这个流程自己就理解了。

想搞清楚HashMap在并发场景下的问题?两个线程同时put,debug进resize方法看扩容过程中的链表操作,数据覆盖是怎么发生的就大概知道了。。

写demo的关键是:把问题缩小到最小可验证单元。 不要搭一个完整的项目来验证一个小问题。3个类、5行配置就能说明白的事情,不需要搭一个完整的Spring Boot工程。


最近在知乎出了「应付6000万会员的秒杀系统专栏」和「几亿用户,百万并发的C端商品系统实战」专栏,感兴趣的可以订阅一下。至于知识星球的,可以搜:

  • • 老码头的技术浮生录

它是一个能实际帮你解决难题的星球。有问题的,找知心的Sam哥,支持无限次语音一对一解决你遇到的难题。「另外后续我新写的所有对外的付费专栏,在星球内都是免费的,且可以拿到所有源代码。」

知识星球内后续将推出20+个付费专栏,覆盖电商全链路:

选购线
用户会员营销线
中后台
购物车服务
营销系统
订单系统
商品服务
用户系统
支付系统
菜单服务
结算服务

从前台选购到中后台结算,星球成员全部免费,后续新增也不额外收费。

我的知乎账号:

  • • SamDeepThinking
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-05-21 05:52:01 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/599798.html
  2. 运行时间 : 0.242427s [ 吞吐率:4.12req/s ] 内存消耗:4,584.57kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=a835cd7b4baccfa43fb6b1b825afa023
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  1. CONNECT:[ UseTime:0.001095s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001445s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000661s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000655s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001311s ]
  6. SELECT * FROM `set` [ RunTime:0.000579s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001652s ]
  8. SELECT * FROM `article` WHERE `id` = 599798 LIMIT 1 [ RunTime:0.001408s ]
  9. UPDATE `article` SET `lasttime` = 1779313921 WHERE `id` = 599798 [ RunTime:0.010011s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000733s ]
  11. SELECT * FROM `article` WHERE `id` < 599798 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001344s ]
  12. SELECT * FROM `article` WHERE `id` > 599798 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001020s ]
  13. SELECT * FROM `article` WHERE `id` < 599798 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004619s ]
  14. SELECT * FROM `article` WHERE `id` < 599798 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003080s ]
  15. SELECT * FROM `article` WHERE `id` < 599798 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002898s ]
0.246393s