What exactly is the MVC Design Pattern?
An application's design is divided into three components using the MVC design pattern:
Model: Data and logic are handled by the Model.
View: manages the output (presentation)
Controller: It is in charge of the application's processing.
The MVC design pattern separates Model and display, allowing developers to concentrate on their primary competencies and communicate more effectively.
Instead of focusing on the Model and controller layers, web designers must focus solely on the display layer. Developers can alter the Model's code but usually do not need to change the display layer. User actions are processed via controllers. The layer model and views may be altered throughout this procedure.
JSF Architecture
JSF was created with the MVC design pattern in mind so that applications may be well-designed and maintained. To comprehend this truth, we must first understand the MVC design pattern, how it aids in application design, and how we can make our web application simple to maintain.
(Source: medium.com)
JSF is a Web development framework based on components. Reusable components make it simple to rapidly and efficiently design a Web interface for a business application. JSF
simplifies it by defining a well-defined abstraction of UI elements that conceals implementation details so that a user of the components doesn't have to know the internal structure and can focus on designing rather than configuring complicated UI interfaces.
You may, for example, establish a view component for display logic and a model component for implementing business logic. Another component of a Web application is a controller, which directs the execution of various model operations and navigates from one view to the next.
A Controller Servlet, FacesServlet, a centralized configuration file, faces-config.xml, and a collection of event handlers for the Web application make up the controller element of the JSF architecture. The Front Controller Servlet receives all requests and controls each request's processing life cycle to respond to the client.
FacesServlet is a Servlet in JSF responsible for managing the Web application's request processing life cycle and is also utilized by JSF to build the user interface. The web.xml file in every JSF application defines a Java Servlet type FacesServlet. FacesServlet, through which all requests are sent, is likewise configured with the application settings.
The FacesServlet also controls the flow of an application's pages based on the results of component events. The Front Controller design pattern represents this method of dealing with page flow.
(Source: Oracle.com)
Client requests are also managed by the FacesServlet, which refers to the page mappings defined in the faces-config.xml configuration file. A lot of JSF configurations are contained in this configuration file. Event Listeners react to component events, which conduct some processing and produce a FacesServlet-usable result.
In the JSF design, the Model is a collection of server-side JavaBeans that obtain values from model components such as the database and construct methods based on them. These JavaBeans may be stored in a database through an underlying persistence layer. Java Data Objects, Enterprise JavaBeans, or an Object-Relational Mapping implementation like hibernating may all be found at this layer. In the JSF architecture, stateful Ul components make up the view.
UI Components are rendered in various ways depending on the client type. The view delegated this work to different renderers, each responsible for a different sort of output, such as HTML or Wireless Markup Language (WML). Additional delegates, such as validators and converters, can be attached to individual components. The values supplied by the user are validated and converted using converters. If the string values must be utilized in computation, the client always offers strings as values for input fields that may need to be transformed into numerical data types. Validators examine if the values provided by the client are syntactically accurate or conform to a predefined format. The view also includes resources that may be utilized to make the Web application more localized.
You can also read about Data Warehouse Architecture here.
Frequently Asked Question
What are JSF (JavaServer Faces) User Interface Components?
HTML form components and other essential HTML elements used to show or accept data from the user are represented by the JavaServer Faces HTML tag library. After submitting the form, a JSF form transmits this data to the server.
In JSF (JavaServer Faces), how do you refer to a bean method?
We're referring to a managed bean method that conducts component navigation processing and produces a logical conclusion String.
What exactly are Facelets?
It's a simple page declaration language used to create JavaServer Faces views in HTML format.
In JSF (JavaServer Faces), what is the f:validateLongRange tag?
It's used to see whether a component's local value falls within a specific range. Any numeric type or String that may be converted to a long must be used as the value.
Conclusion
Finally, you've concluded this article. Congratulations!! You learned about JSF Architecture in this blog. You studied JSF, JSF MVC design, and architecture.
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