淺談備受開發者好評的.NET core敏捷開發工具，講講LEARUN工作流引擎

{"type":"doc","content":[{"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":"通俗來講，所謂一個工作流管理系統，如果將其拆分出來一個個單講話，大致可理解爲由工作流引擎、工作流設計器、流程操作、工作流客戶界面、流程監控、表單設計器、與表單的集成以及與應用程序的集成等幾個部分組成。"}]},{"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":"1. 工作流引擎"}]},{"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":"顧名思義，工作流引擎是工作流管理系統的核心部分，主要提供了對工作流定義的解析以及流程流轉的支持。工作流定義文件描述了業務的交互邏輯，工作流引擎通過解析此工作流定義文件按照業務的交互邏輯進行業務的流轉，工作流引擎通常通過參考某種模型來進行設計，通過調度算法來進行流程的流轉(流程的啓動、終止、掛起、恢復等)，通過各種環節調度算法(SPLIT、AND、OR等)來實現對於環節的流轉(環節的合併、分叉、選擇、條件性的選擇等)。"}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/59/5928bb21c7bd76c44508411471cb615b.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"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":" "}]},{"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":"2. 工作流設計器"}]},{"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":"這是一套高效快捷的可視化的流程設計工具，開發引擎中有包括表單設計、流程設計、流程管理、流程日誌在內的多個模塊。用戶可以通過拖拉點拽等可視化操作來繪製流程，僅使用鼠標即可對於環節處理、環節表單、環節參與者進行詳細配置。使用這一類高容錯率和高透明度的設計方式，將從根本上消除開發過程中出錯的可能。"}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/d8/d8a54aaf6f7386159bd27a6a04b832fd.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"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":" "}]},{"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":"3. 流程操作"}]},{"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":"流程操作是指對於各個環節的細節操作，如啓動流程、終止流程、掛起流程、直流、分流(單人辦理)、並流(多人同時辦理)、聯審等，象這些流程操作都是可直接基於引擎所提供的環節調度算法來直接支持的，而在實際的需求中，通常需要自由的對於流程進行干涉，如取回、回退、跳轉、追加、傳閱，而這些流程操作對於工作流引擎來說是不合理的，因此必須單獨的去實現。"}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/db/db11693b7c83323f19bf051e614b7a06.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"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":" "}]},{"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":"4. 工作流客戶界面"}]},{"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":"客戶界面程序是工作流系統的可視化表現形式，通常使用Web方式進行展現，通過提供待辦列表、已辦列表、執行流程操作、查看流程歷史信息等來展現工作流系統的功能。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/19/19b8add21dd84fec9578e010b416c88e.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"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":" "}]},{"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