July 2019
Intermediate to advanced
480 pages
9h 35m
Chinese
Content preview from 持續交付｜使用Java
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從管道部署與釋出 |
275
你可以在外部程式庫 java-utils（
https://github.com/quiram/java-utils
）參考實際的語義
化版本系統範例。如果你採用 java-utils 並且研究過 v4.0.0 至 v4.6.0，你可以發現，每
一個新版都只在 helper 類別加入方法，這顯然是回溯相容的變動。v4.6.0 的下一版是
v5.0.0，它代表有非回溯相容的變動。當你查看這個新版本的變動時，可以看到方法
ArgumentChecks. ensure(Callable<Boolean>, String)
的意義已經改變了；在 v4.6.0，這
個方法的第一個參數預期接收失敗情況，但是在 v5.0.0，它預期接收通過情況，兩者正
好相反！
v5.0.0 的下一版是 v5.0.1，代表修復 bug。事實上，你可以從變動紀錄看到，v5.0.0 將
上述
ensure
方法的意義反過來了，但是它沒有在程式庫中更新每一個呼叫這個方法的位
置，因此破壞了一些功能，v5.0.1 是為了修復它們。
v
是什麼意思？
有時不同的組織會推出略有不同但通常可互通的最佳做法，版本控制就
是其中一個例子。雖然 semver 提倡純數字的版本號碼，但 GitHub 主張
在版本號碼前面加上字母 v。這兩種做法不相容，因為在技術上，GitHub
樣式指的是一個指向特定版本的
標籤
，而不是版本本身。按照 GitHub
的說法，v1.2.3 是引用程式碼版本 1.2.3 的標籤。事實上，就連 semver
存放區也在它的版本中使用 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.