Ticketing_system_without_synchronization.java

class Ticket {
  private String name;
  private String status;
  
  public Ticket(String name, String status) {
    this.name = name;
    this.status = status;
  }
  
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getStatus() {
    return status;
  }
  public void setStatus(String status) {
    this.status = status;
  }
}

class TicketingSystem {
  static final Ticket number1 = new Ticket("Number1", "open");
  static final Ticket number2 = new Ticket("Number2", "open");
  
  static Ticket[] numberList = new Ticket[] {number1, number2};
  
  public static String getNextAvailableTicket() {
    String availableNumber = null;
    try {
      for (Ticket number: numberList) {
        if(number.getStatus() == "open") {
          number.setStatus("pending"); // changing the state of the object
          
          System.out.printf("Thread name %s - number found %s \n",Thread.currentThread().getName(), number.getName());
          Thread.sleep(5000); // assume processing some business logic
          number.setStatus("open"); // decide to put it back due to some error
          
          availableNumber = number.getName();
          break;
        }
      }
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    return availableNumber;
  }
}

class TicketCounter extends Thread {
  TicketingSystem ticketingSystem;
  
  public TicketCounter(String name) {
    this.setName(name);
    start();
  }
  @Override
  public void run() {
    System.out.println(TicketingSystem.getNextAvailableTicket());  
  }
}

public class SyncExample {
  public static void main(String[] args) {
    try {
    TicketingSystem ts = new TicketingSystem();
    
    TicketCounter tc1 = new TicketCounter("Thread 1");
    Thread.sleep(1000);
    TicketCounter tc2 = new TicketCounter("Thread 2");
    
      tc1.join();
      tc2.join();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}