外文翻譯中小型企業(yè)員工工作信息管理系統(tǒng)-資料下載頁
【導(dǎo)讀】Smalltalk-80并在軟件的設(shè)計(jì)中廣泛應(yīng)用。本文介紹一種基于MVC框架的的新網(wǎng)絡(luò)應(yīng)。這種框架把實(shí)施邏輯與表現(xiàn)形式獨(dú)立開來。擴(kuò)展性以及使用模塊數(shù)據(jù)庫備案、模板數(shù)據(jù)庫通訊對象和緩沖隊(duì)列的性能。目前軟件設(shè)計(jì)的主題之一是網(wǎng)絡(luò)應(yīng)。用開發(fā)模式和工具的。它們直接影響系統(tǒng)的幾個(gè)關(guān)鍵因素比如可維護(hù)性、可擴(kuò)展性、穩(wěn)定性和安全性。本文中，基于MVC1的網(wǎng)絡(luò)應(yīng)用程序的設(shè)計(jì)模式是為解決這兩類。MVC由三種對象組成。在出現(xiàn)MVC之前用戶界面的設(shè)計(jì)傾向于把這些東西做在一起。了它們，增加系統(tǒng)的靈活性和可重用性。MVC把視圖和模型獨(dú)立開來在它們之間建。立了―subscribe/notify‖協(xié)議。一個(gè)視圖必須確保其正確反映模型的狀態(tài)。數(shù)據(jù)發(fā)生改變視圖會(huì)得到相應(yīng)的通知。作為回應(yīng)每個(gè)視圖都會(huì)有更新自身的機(jī)會(huì)。機(jī)制和事件回應(yīng)機(jī)制。直到JSPModel2版這種情況并沒有受到任何改善。的Java語言功能JSPModel24某種程度上實(shí)行MVC設(shè)計(jì)理念。制器不僅控制選擇同時(shí)響應(yīng)模型的模塊還負(fù)責(zé)對處理JSP轉(zhuǎn)移數(shù)據(jù)提供模塊。分LPM中心從模型中心收到數(shù)據(jù)。
【正文】 wnkernel database system description database model database and LPM database. Thesethree control objects/classes are divided from the raw Controller. Using these controlobjects/classes and databases the following parts of this paper will explain the design ideaand implementation mechanism of this system frame. Firstly we consider the SYSController and the System Description Database. Theyare responsible for receiving the user requests and searching the relevant transaction logicaccording to these requests. The System Description Database can be a XML2 file or aset of XML files. This database describes the different transaction logic related to differentuser requests one by one. The transaction logics mainly include the interactive mode datasources and error handling etc. They are anized in a tree structure. The SYSControllersearches the System Description Database. It bines the user requests and thetransaction logic searched out from the database and then delivers them to Messenger toencapsulate. There are two ways for SYSController to search the database. One uses theDOM Document Object Model object3. When the application system boots this wayrequires the whole database to be loaded into RAM after analyzed by the DOM Parser. Thedatabase resides in the RAM in a DOM tree structure. The other one uses SAX SimpleAPI for XML interface. Both of them have their own advantages and DOM can implement structural search. It can achieve the efficiency in the case oflarger database but it also costs more system resources. The SAX interface is famous forits high efficiency and less system resources requirements. The only disadvantage is that itobtains some information less conveniently than the DOM does. Secondly we consider the Model Center and Model layer pletesthe defined transaction logic by calling the given module. Model Database contains a massof objects and modules. These objects and modules encapsulate the responding methodsrelative to specific transaction logic. When Model Center receives the transaction messagesfrom Messenger it selects suitable objects or modules according to the differenttransaction logic encapsulated in the message. Then it encapsulated the handled data ingiven format and delivers them to the LPM Center. Furthermore each object or moduleonly needs to concern.
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