Presetation - SALESPOINT: A Java framework for teaching object-oriented software development

SRC : http://www.sciencedirect.com/science/article/pii/S016764231200069X

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1. SALESPOINT: A Java framework for teaching object-oriented software development 49941131 任家輝 National Formosa University Department of Information Management
2. • Authors: Steffen Zschaler a, Birgit Demuthb, Lothar Schmitz • Journal title: Science of Computer Programming No.79 (2014) 189–203 • Journals’ Impact factor : 0.548 • Its ranking : 86/105 National Formosa University Department of Information Management
3. Problem • Teaching systematic object-oriented software development to undergraduate students is difficult. National Formosa University Department of Information Management
4. Solution • The solution that in our experience satisfies all these requirements is to use an application framework for an everyday application domain for example, the business domain. National Formosa University Department of Information Management
5. In academic & industrial • In academic as well as industrial settings beginners will often join projects that are already well in progress. Finding out enough about the project’s structure to be able to do one’s job is similar to learning how to apply a framework. National Formosa University Department of Information Management
6. For the organizers • It is easy to define a number of similar projects and to scale their complexity from moderate to reasonably hard. Since they are based on the same framework, all the different tasks are still comparable. National Formosa University Department of Information Management
7. For the students • It is simpler to extend the application architecture predefined by the framework than to design it for each application from scratch. National Formosa University Department of Information Management
8. • Beginners get a chance to learn good design by example: Frameworks by definition are designed for change. Therefore, they typically exhibit patterns that increase flexibility. National Formosa University Department of Information Management
9. Object-Oriented Programming, OOP Main Class Implements Interface Extends Interface Extends Interface Extends Class Extends Class National Formosa University Department of Information Management
10. Studying OO thinking • Education in object-oriented (OO) technologies has become a core part of any modern education in software engineering. • A well-known problem with education in this field is the relatively long period of time that is required to get accustomed to ‘OO thinking’. National Formosa University Department of Information Management
11. Studying OO thinking • learn to solve problems by building small communities of interacting objects; students with a strong procedural programming background may first have to unlearn their previous algorithm-centered approach; National Formosa University Department of Information Management
12. Studying OO thinking • adopt the habit of reusing existing classes instead of inventing new ones; this requires them to know where to look for reusable components; National Formosa University Department of Information Management
13. Studying OO thinking • start to think flexibly about the organization of the software development process; beginners have to be taught the importance of a formal software life cycle and of a proper requirements analysis National Formosa University Department of Information Management
14. Studying OO thinking • begin to understand and apply patterns and frameworks National Formosa University Department of Information Management
15. Object Relational Mapping, ORM • An ORM (Object Relational Mapping) is a tool that lets you query and manipulate data from a database using an object paradigm. National Formosa University Department of Information Management
16. ORM Example $user = new ORM('user'); $user->name = 'fancy'; $user->save(); National Formosa University Department of Information Management
17. ORM National Formosa University Department of Information Management
18. HyperSQL DataBase • HSQLDB (HyperSQL DataBase) is the leading SQL relational database software written in Java. It offers a small, fast multithreaded and transactional database engine with in-memory and disk-based tables and supports embedded and server modes. National Formosa University Department of Information Management
19. Hibernate National Formosa University Department of Information Management 圖片來源: http://www.visual-paradigm.com/tutorials/sdeecorm.jsp
20. Cookie VS Session Cookie • 儲存在Client端，因此能 夠由Client端修改。 • 能夠長時間的儲存 • 僅能儲存序列化的資料 • 通常用來儲存需要長時間 留存且不敏感的資料(例如: 記住登錄狀態) Session • 儲存在Server端 • Client端關閉連線後則須 重新請求新的Session • 能夠儲存任何物件型態 • 通常用來儲存較敏感的資 料(例如: 會員帳號及權限、 牽涉到現金的訊息) National Formosa University Department of Information Management
21. System Design 類別 • 管理者 • 消費者 • 產品分類 • 產品分類 / 產品 函數 • 帳戶設定、網站參數設 定 • 購買產品 • 設定分類及產品…等。 物件操作 • 帳戶新增/刪除/修改/ 查詢 • 存貨增加/減少 • 分類及存貨的編輯及新 增...等 National Formosa University Department of Information Management
22. Schematic project course time table National Formosa University Department of Information Management
23. Core classes of the application control part of Salespoint. National Formosa University Department of Information Management
24. Core classes for data management within Salespoint. Associations between interfaces are implemented through appropriate getter and setter operations in the interfaces. For example, interface Catalog provides operations for adding, getting, or removing CatalogItems. National Formosa University Department of Information Management
25. Persistence Layer & Request/response pattern of Salespoint2010 web applications National Formosa University Department of Information Management
26. Model-View-Controller(MVC) 引用自http://www.jaceju.net/ National Formosa University Department of Information Management
27. Salespoint2010 package structure. National Formosa University Department of Information Management
28. System functions • Selling goods • Buying goods • Hiring out equipment • Accepting orders • Handling complaints or refunds • Taking on goods for sale or return • Repairing or cleaning things • Special services • Accounting • Regularly checking the supplies • Refilling stocks and cash registers • Ordering goods in time • Adding new items to the catalog • Removing slow-moving articles • Adapting the retail prices National Formosa University Department of Information Management
29. Experimental Methods • group students into teams of about 4 to 6 each • ask them to adopt a chief programmer team organization • Technical questions and requests for framework correction or extension are handled in online forums as well as in face-to-face meetings by student tutors specializing in technical support. National Formosa University Department of Information Management
30. 實際系統畫面 (前端) National Formosa University Department of Information Management
31. Screenshot representing input data validation. National Formosa University Department of Information Management
32. 問題一 SALESPOINT是以何種語言實作的 框架? National Formosa University Department of Information Management
33. 系統初始設定 National Formosa University Department of Information Management
34. 資料庫設定 • 系統預設透過JDBC的方式將資料儲存至檔案中 • spring.datasource.url=jdbc:hsqldb:db/videoshop • 也可以更改為jdbc:hsqldb:db:mem/videoshop 將資 料儲存至記憶體中。 • 透過hibernate去設定ORM的方式 – validate: validate the schema, makes no changes to the database. – update: update the schema. – create: creates the schema, destroying previous data. – create-drop: drop the schema at the end of the session. • pring.jpa.hibernate.ddl-auto=update National Formosa University Department of Information Management
35. 產品類別 National Formosa University Department of Information Management
36. 用戶類別 National Formosa University Department of Information Management
37. 產品評論類別 National Formosa University Department of Information Management
38. 初始化產品類別 宣告及儲存產品 National Formosa University Department of Information Management
39. 初始化用戶 National Formosa University Department of Information Management
40. 註冊時的資料驗證 National Formosa University Department of Information Management
41. 購物車的控制 National Formosa University Department of Information Management
42. 結單 National Formosa University Department of Information Management
43. Conclusions(Students) • Salespoint has been used successfully in approx. 730 student projects since its inception in 1997; a total of approx. 4380 students have passed the project course. • In general, student reactions have been favorable: While many complain about the amount of work required, they enjoy the opportunity to work as a team on a realistic project for an extended period of time. • The reported total time effort including all project phases in this semester averaged 17.9 h per student and week. In subsequent discussions however, most students acknowledge the fact that learning real software development with ‘toy example applications’ is not possible. National Formosa University Department of Information Management
44. Review • 使用JAR封裝了大多數的類別，讓學生只知 道使用卻不知道其內部的實作方法及原理。 • 系統中又另外載入了其他的framework， 導致框架過於肥大。 • 安全性上未做注入防禦及跨網站指令碼防 禦。 National Formosa University Department of Information Management
45. Improvement • 使用PHP針對上述缺點進行改善，設計了 一套MVC Framework，並加入了相關的購 物車模組(Cart Module)。 National Formosa University Department of Information Management
46. 問題二 購買產品的動作是以類別(Class)表 示還是以函數(Function)表示 National Formosa University Department of Information Management
47. 問題三 購物籃的資料是由下列何種方式儲存 的? A. Cookie B. Session National Formosa University Department of Information Management
48. Develop a New MVC based php framework National Formosa University Department of Information Management
49. PDO National Formosa University Department of Information Management
50. PDO != ORM National Formosa University Department of Information Management 來源: http://blog.roga.tw/2010/06/淺談-php-mysql-php-mysqli-pdo-的差異/
51. Planning National Formosa University Department of Information Management
52. 設計模組 – Blue Framework System View Template HTML CSS JavaScript Config DataSource Template Path System Parameters Controller UserController Model User Model PageController Model Page Model NewsController Model News Model SalesController Model Sales Model National Formosa University Department of Information Management
53. 框架運行步驟 Load Config File Setting Class Path Get Module Set Module- Controller(Extend From Core/Controller) Set Route Execute Action National Formosa University Department of Information Management
54. Demo National Formosa University Department of Information Management
55. 問題四 自動登入機制使用何種方式記錄登入 狀態? A. Session B. Cookie National Formosa University Department of Information Management
56. 問題五 在MVC架構中，使用者接觸(下達動作)的對象為? A. Model B. View C. Contorller National Formosa University Department of Information Management
57. Screenshot National Formosa University Department of Information Management
58. Product Management National Formosa University Department of Information Management
59. Add Product National Formosa University Department of Information Management
60. Category Management National Formosa University Department of Information Management
61. Order Processing National Formosa University Department of Information Management
62. Product Detail National Formosa University Department of Information Management
63. Cart National Formosa University Department of Information Management
64. Order Status National Formosa University Department of Information Management
65. Order Detail National Formosa University Department of Information Management
66. Notice Paid National Formosa University Department of Information Management
67. Order Analysis National Formosa University Department of Information Management
68. Add Custom Page(1/2) National Formosa University Department of Information Management
69. Add Custom Page(2/2) National Formosa University Department of Information Management
70. Page Management National Formosa University Department of Information Management
71. Disadvantages • 程式耦合度還是過高。 • 使用RDBMS作為資料庫引擎，在大量資料 處理上較為耗時。 • 樹狀階層採用Nested set model建立巢狀 資料表，在新增或移動節點時消耗過多的 效能，不過對於一般應用來說，等同是用 後台儲存操作的效能來換取前台讀取的效 能。 National Formosa University Department of Information Management
72. Further works 應用面 • 加入社群的功能，除了既 有廠商外，讓使用者有自 己專屬的商品牆，將系統 轉變為線上購物社群 (雲 端市集) • 結合FB及Google+既有的 社群會員系統，讓使用者 不用在註冊新的帳號 系統架構面 • 部分資料以JSON格式儲 存至檔案中，減少資料關 聯時浪費的多餘時間 • 修改程式架構，降低模組 間的耦合度。 National Formosa University Department of Information Management
73. 提問時間 National Formosa University Department of Information Management
74. Thanks 感謝您的聆聽 National Formosa University Department of Information Management