/*
Taken from https://java2blog.com/java-cyclicbarrier-example/ (accessed 24.08.2022) and slightly modified.
*/

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class Student implements Runnable{

    private final CyclicBarrier cyclicBarrier;
    private long sleepTime; // time that the student sleeps

    public Student(CyclicBarrier cyclicBarrier,long sleepTime){
        this.cyclicBarrier = cyclicBarrier;
        this.sleepTime = sleepTime;
    }

    @Override
    public void run() {

        try {
            Thread.sleep(sleepTime);    // student sleeps for some time
            System.out.println(Thread.currentThread().getName() +
                    " is waiting for "+(cyclicBarrier.getParties()-cyclicBarrier.getNumberWaiting()-1)+
                    " other students to arrive");
            /*
             * The student waits for other students to also call their await method.
             * As soon as enough students have called their await method, the party can start.
             */
            cyclicBarrier.await();

        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (BrokenBarrierException e) {
            e.printStackTrace();
        }

        System.out.println("As "+cyclicBarrier.getParties()+ " students have arrived, "
                + Thread.currentThread().getName() +
                " starts to party now!");
    }

}