滴滴開源DRouter：一款高效的Android路由框架

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開放接口層"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"DRouter在接口層做了大量的精簡和優化，在靈活性和易用性方面做了很多權衡，主要目的是減少冗餘API，使框架更爲簡單的使用和接入。比如Request和ServiceLoader作爲最核心的API方法數非常少，一些不常用的功能會放到Extend中。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"▍RouterFlow"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.geekbang.org\/infoq\/7a\/7a91ea748ffa8d1cfcd5e79a588bee70.webp","alt":"Image","title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"路由數據流從創建Request開始，通過URI在路由表中找出所有的結點，會按照RouterHandler、UI的順序以及優先級順序執行。每一個元素都可以定義自己的攔截器，這裏的攔截器必須放行以後才能執行對應的結點；同時對於RouterHandler執行完又可以決定是否攔截後面所有的結點。當所有的結點執行完，且異步暫存態也都已釋放，最終把結果回傳給請求處。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"▍ServiceFlow"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.geekbang.org\/infoq\/22\/2285ad89cbb6906329517b0f80aaf66c.png","alt":"Image","title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"ServiceLoader既可以獲取Class也可以獲取對象實例，核心是路由表和過濾器，其中FeatureMatcher擁有多維過濾的功能。像滴滴這種多業務場景的應用，在使用MVP架構時對P的匹配至少會需要根據所在國家、訂單業務線、訂單狀態三個維度來分別對應唯一的Presenter，多維過濾就很容易解決這個問題。性能方面，對象實例化會根據構造器類型，利用插件生成的RouterProxy代碼通過new來實例化無參對象（默認構造）或者反射實例化有參對象（非默認構造）。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"▍RemoteFlow"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.geekbang.org\/infoq\/ee\/ee2b73c047f94e9da5798b427fd45e58.webp","alt":"Image","title":null,"style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"DRouter的跨進程功能是一大特色，左側綠色代表客戶端，自上而下會把所有的參數打包成命令，這裏支持任意類型，框架內有一套完整的機制通過遍歷集合、轉換、組裝，最後存儲到Parcel裏。利用Authority查找到服務端的Provider並隨之利用此通道返回服務端的Binder。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在服務端，也就是右側的紫色，會自下而上把命令解包和分發。然後利用DRouter的路由RouterHandler和ServiceLoader的功能，使得客戶端的命令最終在服務端執行。插件會在服務端生成一段代碼，這段代碼可以避免使用反射，提高整體的執行效率。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"整個過程同步執行，使用簡單、高效。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"寫在最後"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"DRouter是一套功能完善、定製化程度高的路由框架，具有易於上手、架構清晰、性能優良的特點。現已成爲滴滴不可或缺的基礎組件之一。DRouter作爲組件化方案的踐行者，將繼續提升各個場景的支持能力，也歡迎各位開發者使用並提出寶貴的反饋意見。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"GitHub開源地址："},{"type":"text","text":"https:\/\/github.com\/didi\/DRouter"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"horizontalrule"},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"頭圖：Unsplash"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"作者：DRouter"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"原文：https:\/\/mp.weixin.qq.com\/s\/c6E7NOKNWbTNYDLZRWAwSw"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"原文：滴滴開源DRouter：一款高效的Android路由框架"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"來源：滴滴技術 - 微信公衆號 [ID：didi_tech]"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"轉載：著作權歸作者所有。商業轉載請聯繫作者獲得授權，非商業轉載請註明出處。"}]}]}