E-Commerce Applications Development
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This lecture covers the development of e-commerce applications, focusing on the framework definition and design patterns like model-view-controller (MVC) and singleton. It highlights how these patterns streamline development processes by providing reusable solutions for common problems. Additionally, it discusses the registry's role in managing object collections and facilitating tasks like database querying and user data management.
E-Commerce Applications Development
- 1. CMP-3110 ~ E-Commerce Applications Development Lecture 02 Planning Our Framework
- 2. Framework • Definition • a basic structure underlying a system, concept, or text. • In general, a framework is a real or conceptual structure intended to serve as a support or guide for the building of something that expands the structure into something useful.
- 3. Patterns • Definition • a design pattern is a general repeatable solution to a commonly occurring problem in software design. • A design pattern isn't a finished design that can be transformed directly into code • Uses of Design Patterns • speed up the development process • providing tested, proven development paradigms
- 4. Patterns Which patterns will be used? • Model-View-Controller (MVC) • Registry • Singleton
- 5. Model-View-Controller (MVC) • Model • Represents an object. It can also have logic to update controller if its data changes. • View • Represents the visualization of the data that model contains. • Controller • Acts on both model and view. It controls the data flow into model object and updates the view whenever data changes. It keeps view and model separate.
- 8. Model-View-Controller (MVC) Reference: Software Engineering by Ian Summerville – 9th edition
- 9. Registry • Provides a means to store a collection of objects within our framework (Container of objects for reuse). • Each set of controllers and models we create need to perform some shared tasks, including: • Querying the database • Checking if the user is logged in, and if so, getting certain user data • Sending data to the views to be generated (template management) • Sending e-mails, for instance to confirm a purchase with the customer • Interacting with the server's filesystem, for instance to upload photographs of products
- 10. Registry
- 11. Singleton • Restrict an object to one instance only • However, we will use it to ensure we have only one instance of our registry available in the framework at any point of time.
- 15. Pattern Implementation: Registry • Needs • It needs to have a method to create certain objects and store them with a key. • It needs another method, which when passed with a key as a parameter, returns the object in question. • working • Processing the incoming URL, so our “index.php” file can route the request correctly • Building URLs based on a series of parameters, a query string, and the URLdisplay/generation method we use • Pagination
- 16. Pattern Implementation: Registry • The code in the book makes up the basics of our registry, with two arrays: • One for objects • One for settings
- 17. Pattern Implementation: Singleton • The singleton pattern is very easy to implement, as it requires only a few minor changes to a standard PHP class, to ensure that it is only ever instantiated once. • Needs • A private constructor is used to prevent the direct creation of objects from the class. • The expensive process is performed within the private constructor. • The only way to create an instance from the class is by using a static method that creates the object only if it wasn't already created.
- 18. Routing requests