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UnfairBarberShop.java
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UnfairBarberShop.java
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import java.util.concurrent.Semaphore;
/**
* @author Masoud Dabbaghi
* @version 1.0
* @link https://github.com/masoudd2159/Unfair-Barber-Shop
* @since 2019
**/
public class UnfairBarberShop extends Thread {
private static final int TIME_SLEEP = 2000;
private static Semaphore maxCapacity;
private static Semaphore sofa;
private static Semaphore barberChair;
private static Semaphore coord;
private static Semaphore custReady;
private static Semaphore leaveBarberChair;
private static Semaphore payment;
private static Semaphore receipt;
private static Semaphore finished;
private UnfairBarberShop() {
maxCapacity = new Semaphore(20, true);
sofa = new Semaphore(4, true);
barberChair = new Semaphore(3, true);
coord = new Semaphore(3, true);
custReady = new Semaphore(0, true);
leaveBarberChair = new Semaphore(0, true);
payment = new Semaphore(0, true);
receipt = new Semaphore(0, true);
finished = new Semaphore(0, true);
}
class Customer extends Thread {
int id;
Customer(int id) {
this.id = id;
}
@Override
public void run() {
try {
maxCapacity.acquire();
this.enterShop();
sofa.acquire();
this.sitOnSofa();
barberChair.acquire();
this.getUpFromSofa();
sofa.release();
this.sitOnBarberChair();
custReady.release();
finished.acquire();
this.leaveBarberChairs();
leaveBarberChair.release();
this.pay();
payment.release();
receipt.acquire();
this.exitShop();
maxCapacity.release();
} catch (
InterruptedException e) {
e.printStackTrace();
}
}
private void enterShop() {
try {
System.out.println("Customer " + id + " Enter To Shop");
sleep(TIME_SLEEP);
} catch (InterruptedException ignored) {
}
}
private void sitOnSofa() {
try {
System.out.println("Customer " + id + " Sit on Sofa");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void getUpFromSofa() {
try {
System.out.println("Customer " + id + " Get Up From Sofa");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void sitOnBarberChair() {
try {
System.out.println("Customer " + id + " Sit On Barber Chair");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void leaveBarberChairs() {
try {
System.out.println("Customer " + id + " Leave Barber Chairs");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void pay() {
try {
System.out.println("Customer " + id + " Pey Money");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void exitShop() {
try {
System.out.println("Customer " + id + " Exit Shop");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
class Barber extends Thread {
int id;
Barber(int id) {
this.id = id;
}
@Override
public void run() {
while (true) {
try {
custReady.acquire();
coord.acquire();
cutHair();
coord.release();
finished.release();
leaveBarberChair.acquire();
barberChair.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
private void cutHair() {
try {
System.out.println("Barber " + id + " Cut Hair");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
class Cashier extends Thread {
int id;
Cashier(int id) {
this.id = id;
}
@Override
public void run() {
while (true) {
try {
payment.acquire();
coord.acquire();
acceptPay();
coord.release();
receipt.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
private void acceptPay() {
try {
System.out.println("Cashier " + id + " Accept Pay");
Thread.sleep(TIME_SLEEP);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
UnfairBarberShop unfairBarberShop = new UnfairBarberShop();
unfairBarberShop.start();
}
@Override
public void run() {
for (int i = 0; i < 50; i++) {
Customer customer = new Customer(i);
customer.start();
}
for (int i = 0; i < 3; i++) {
Barber barber = new Barber(i);
barber.start();
}
for (int i = 0; i < 1; i++) {
Cashier cashier = new Cashier(i);
cashier.start();
}
}
}