This is a project for the practical work of the Operating system module in The University of Ibn Khaldoun - Algeria in which we had used the notion of threads and parallelism to make a library simulator. this library simulator will simulate the behaviors of Readers : student and professors, and their communication to take a book, take a sit , block when ever there is not a book, or a sit, prioritize the Professor then student in getting book's and so on.
The Code was Written In Pure Java in the Intellij IDEA IDE. The synchronisation has been made using semaphores because it is difficult to manage 79 semaphores, so we accepted the challenge, we have coded the GUI with the JavaFX library, in which there are were a lot of classes to make a simple or a complex GUI, for animating things in the scene we used also the packages of JavaFX : javafx.animation, with this package it is very easy to animate in a complex or a simple way, for the static information like the images, the coordinates of the points and books we used simple final classes and they are commented everywhere.
First of all, the goal was to get knowledge how to use threads in java and how to manage threads by using semaphores and different kind of mutual exclusion to protect critical sections, such as the books in the library, one reader can access to a book. When the others want to access the same book, they will be blocked until the current reader will notifies them when he will finishing and releasing the book, so is the case for the places are also critical section, the table, the chairs, importing places, chain places and so on. Also, By this project we can say that we can use this solution to manage robots in real life, we can imagine that we have robots do different works in the same area, so these robots must know the situation of other robots to make a decision and do an action in the environment if the case we are in fully observable environment, really it is interesting to manage robots by semaphores,they are really great tools to manage problem in the real world of parallelism not only for thread, for this example, it is also for robots, or in general for anything that can execute simultaneously.
First of all, after you pull the code from this repository, try to open it in intellij idea and then launch the application, a window will appear which it contains 3 buttons, the button will have the order to create and launch a thread reader (student or professor) , with the specific book in the choice box that corresponds, and the last button can launch readers if the checkbox is selected with a specific book in the choice box, otherwise the button will launch 20 readers together.
The main application and the resources are in Younes the directory "src": in this directory there is 2 packages the "com.librarysimulator" and "res".
"com.librarysimulator" : contain 4 packages
* "Application" package: contains the Main class of the application in which the GUI is constructed and the
main action such handling event and initialisation of semaphores and so on.
* "Models" package: contain 2 classes
- "Student" extends the thread class and override the run method in which
the life cycle of the student is presented.
- "Professor" extends the thread class and override the run method in which
the life cycle of the professor is presented.
* "Providers" package: contain 3 classes
- "BooksProvider" in which we provide books in the application.
- "CoordinatesProvider" in which we provide all the points by their X and Y coordinates.
- "ImagesProvider" in which we provides the Professor, Student and employees images.
* "Utilities" package: contain one class:
- "ImagesUtilities" in which there is method to create images with predefine configuration.
"res": contain 2 more directories
* "Images" directory: contain all the image in subdivides folders.
* "Others" directory: contain css file for styling the GUI.
Thanks for all who read this code, I wish this code helps people to learn something new, if you find any issue just put it in the repository issue section. Thank you again , Peace :D .
سبحانك اللهم و بحمدك, أشهد ان لا إله إلا أنت استغفرك و اتوب اليك.