July 2019
Intermediate to advanced
480 pages
9h 35m
Chinese
Content preview from 持續交付｜使用Java
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| 第二章
為無伺服器產品實際上是 FaaS 的超集合，它也包含其他的後端即服務（BaaS）產品，
例如 blob 儲存器與 NoSQL 資料存放裝置。FaaS 仍然需要用伺服器執行 app 的功能，但
是它的重點通常是減少運行與維護“功能底層的執行環境與基礎結構”的負擔。它的開
發與計費模型也很獨特，因為它的功能是被外部事件觸發的（可能是時間到了、有用戶
請求透過 API 閘道傳過來，或有物件被上傳到 blobstore），你只要支付功能的執行時間
以及記憶體所需的費用即可。
功能 功能 功能
OS OS OS
容器
虛擬機器監視器（第 1 型）
CPU/記憶體/儲存器 網路
實體基礎設施
部署組態
實體基礎設施
邊界
“平台”
容器 容器
X-aaS
引擎
實體基礎設施
軟體負載平衡器
作業系統
功能 功能
OS OS
容器
虛擬機器監視器（第 1 型）
CPU/記憶體/儲存器 網路
實體基礎設施
容器
作業系統
動態
組態
分散式協調 / 調度器
圖 2-4 用 FaaS 模型部署 Java app。程式碼被包在 JAR 或 ZIP 裡面，接著被部署到底層的平台
（通常使用容器）並透過它來管理。
AWS Lambda 與 Azure Functions 都支援 Java，所以你只要將含有 Java 程式碼的 JAR 或
ZIP 檔上傳到對應的服務來進行部署即可。
持續交付平台的影響
開發者經常有個疑問：app 工件的包裝格式會不會影響持續交付的實作，對於這個問
題，我們的答案與任何有趣的問題一樣：“視情況而定”。答案是“會”的原因是包
裝格式顯然會影響工件的構建 ...
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