Relevance of design patterns within web applications

Inhaltsangabe:Abstract: In 1994 the Gang of Four, consisting of Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides, published the book Design Pattern - Elements of Reusable Object-Oriented Software. Within that book the four information scientists described 23 design patterns, which they classi?ed into the categories Creational Design Pattern, Structural Design Pattern and Behavioral Design Pattern. Even though design patterns exist since 15 years at present, they have not lost relevance. Due to new concepts the usage of design patterns within web application is increasing. Meanwhile all 23 established design patterns are available as PHP implementations. Aside web languages like AJAX, JavaScript, XHTML and CSS also appreciate the strength of design patterns. At first web languages like AJAX, PHP, et cetera will be analyzed if they qualify for the usage of design patterns. At second the usage of design patterns within open source web applications like Typo3, Joomla, Wordpress, et cetera will be examined. At third various web developers of 1&1, web.de, Telekom, et cetera will be interviewed to investigate if and in which amount design patterns are used by companies. Intention of this thesis is to determine the relevance of design pattern within web applications. Thereby advantages will also be shown like disadvantages. Also the question, if design patterns should be used by default or only if the concerning project reached a specific size, will be answered.Inhaltsverzeichnis:Table of Contents: Abstracti Prefaceii 1.Introduction1 2.Analysis of web programming languages2 2.1Definition of recognition characteristics3 2.1.1Regular classes4 2.1.2Abstract classes5 2.1.3Static attributes and methods6 2.1.4Scopes7 2.1.5Inheritance through expansion8 2.1.6Inheritance through implementation9 2.2Examination of de?ned characteristics10 2.2.1ActionScript11 2.2.2AJAX/JavaScript13 2.2.3ASP15 2.2.4PHP17 2.2.5Ruby19 3.Analysis of open source applications21 3.1Definition of recognition characteristics22 3.1.1Analysis by hand23 3.1.2Analysis by recognition characteristics24 3.1.3Analysis by UML to code generator26 3.1.4Analysis by manuals27 3.2Examination of de?ned characteristics28 3.2.1Coppermine Photo Gallery29 3.2.2Drupal31 3.2.3phpBB33 3.2.4WordPress34 3.2.5Zend Framework35 4.Examples of design patterns37 4.1Model View Controller Pattern38 4.2Intercepting Filter Pattern40 4.3Registry Pattern42 4.4Template View [...]