图解的力量

你听过“一图胜千言”这句话吧?在编程领域,我甚至觉得一张图能抵得上一千行代码……


问题所在

这篇文章源自我正在开发的 Db4E 项目,一个用于 Monero 挖矿的部署、运维和实时分析仪表盘。项目原本进展顺利,直到一个奇怪的错误出现:从数据库缓存查询 P2Pool 部署列表时,竟然得到了重复条目。尤其令人困惑的是,列表是通过字典的 values() 方法生成的。理论上不应该出现相同条目,但它们就在那里。


根本原因

深入排查后,我意识到应用里居然存在两个(甚至更多?)数据库缓存对象的副本。我没有集中管理缓存的所有权,于是系统的不同部分各自创建了缓存实例。


重构代码

我开始清理和重构:移动类的位置、传递对象引用、调整构造函数参数。但事情很快变得混乱,我不断迷失方向,不得不反复推倒重来。

项目当时有 32 个类,因此这件事并非微不足道。又把代码弄乱一次后,我决定离开键盘思考一下。事实上,我走得有点远:绕着街区散了个步,认真想了想。


解决方案:画图

我发现自己真正需要的是一张类图,清楚展示各个类之间的关系。只要能看出某个类是包含在另一个类里,还是仅仅传递了一个引用,就够了。

应用程序的类关系

有了这张蓝图,后续实现就简单多了。


结论

图片确实胜过千言。如果你盯着代码看得头昏脑涨,不妨试着画张图。它就像一份蓝图!


后记:Draw.io

我用的是免费的浏览器工具 Draw.io 来画图。强烈推荐,它有这些特点:

  • 免费
  • 内置版本控制
  • 可以保存到各种位置,包括 Google Drive
  • 支持导出多种格式

如果你也在项目里卡住了,试着画出来吧。有时候,穿越一团乱麻般的代码,最短的路就是一支笔和一张图。

2026

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2025

My Art on Etsy

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2024

Aquaponics Update #1

It’s in the construction phase. I need to complete the water circulation process. I bought a fiber glass kit for this (and also to fix my kitchen sink!).

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