Lajavel is a project given to students to deepen their knowledge in object-oriented programming.
It is an attempt at a framework with the particularity of not following the conventional MVC architecture design pattern but rather the ADR pattern.
Note: This project is a student project
Git clone this project.
To start the server simply write :
Application.start(8080);
Then you can register any route you want :
public class MyApp {
public static void main(String[] args) {
Application.start(7070);
// Register route through MVC pattern
Route.register(HttpVerb.GET, "/", IndexController.class, "index");
// Register route through ADR pattern
Route.register(HttpVerb.GET, "/html/search", ShowBookAction.class, ShowBookHtmlResponder.class);
Route.register(HttpVerb.GET, "/api/search", ShowBookAction.class, ShowBookApiResponder.class);
}
}To create an action you must extend the Action class as follows :
public class IndexAction extends Action {
public IndexAction(Responder responder, Context context) {
super(responder, context);
}
@Override
public void execute(Context context) {
//Here you can call all the entities you want
//Then you must pass this objects to the responder, like this :
//Book book = BookRepository.getOneBook();
//this.responder.define(book);
this.responder.respond();
}
}The response function is what the server will respond to.
In this function you can change the response as much as you want.
The View.make() function fetches the HTML file from the resources/views folder.
public class IndexResponder extends Responder {
public IndexResponder(Context context) {
super(context);
}
@Override
public void respond() {
this.context.html(View.make("index"));
}
}Once you have registered your controller through the route you can create it as follows :
public class IndexController extends Controller {
public void index(Context context) {
context.html(View.make("index"));
}
}The method name must be the same as the route you registered, and you must have a context parameter.
Don't forget to create the index.html file in the resources/views folder.
- HTML Template engine
List of colors used in this projects :
Action–domain–responder (ADR) is a software architectural pattern that was proposed by Paul M. Jones as a refinement of Model–view–controller (MVC) that is better suited for web applications. He explain it as follows:
classDiagram
Domain <|-- Action
Responder <|-- Action
Action <.. Domain
Action Domain Responder organizes a single user interface interaction between an HTTP client and a HTTP server-side application into three distinct roles.
Action Domain Responder is an alternative to the "Model 2" misappropriation (for server-side over-the-network request/response interfaces) of the original Model View Controller user interface pattern (for client-side in-memory graphical user interfaces). ADR is a user interface pattern specifically intended for server-side applications operating in an over-the-network, request/response environment.
Aligning expectations and factoring concerns away from the modern derivations of "Model 2" MVC toward Action Domain Responder is not difficult. Here is one way of working through the change in approach.
Action is the logic to connect the Domain and Responder. It invokes the Domain with inputs collected from the HTTP Request, then invokes the Responder with the data needed to build an HTTP Response.
Domain is an entry point to the domain logic forming the core of the application. It may be a Transaction Script, Service Layer, Application Service, or something similar.
Responder is the presentation logic to build an HTTP Response using data it receives from the Action. It deals with status codes, headers and cookies, content, formatting and transformation, templates and views, and so on.
You can find the rest of this explanation on the repository of Paul M. Jones.
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