Java Two Threads Synchronization Problem

Question

Hello to all, i have a scenario like this where a manager open a restaurant which signal the arrival of customer.
Each entity here is one thread.
How to signal the customer from manager that is open state ?
I have a boolean variable (IsOpen) in manager class.
My code:
public class Manager implements Runnable {
     boolean IsOpen, IsStartWorking, IsLastOrder,
          IsClosingTime;
     public void run()
         try
              // while not closing time
              while (true)
                   if (!IsOpen && !IsStartWorking)
                        open();
                        startWorking();
                   prepareCappuccino();
                   prepareHotChocolate();
                   prepareFruitJuice();
                   // serve drink then refill Ingredients based on
                   // order
                   myCoffeePowder.refillCoffeePowder();
                   myCocoPowder.refillCocoPowder();
                   myMilk.refillMilk();
                   myFJ.refillFruitJuice();
                   Thread.sleep(100);
              // Manager alert closing time
              //closingtime();
               //sanityCheck();
               //statisticsDispaly();
               //managerLeave();           
         catch(InterruptedException e)
              e.printStackTrace();
          public void open() {
         IsOpen = true;
          System.out.println(dateFormat.format(cal.getTime()) +
               " Thread Manager: Manager open Restaurant");
          //notifyAll();
}I want to notify the customer thread when the IsOpen state become true.
As you can see from open() method, there is notifyAll() but it turn error because it does not own the monitor.
I have solution like this create a monitor with Isopen variable and once is open notifyAll().
I never tried that.
Please give some comment.
The logic here is model using FSP like below
MANAGER = (manager.open->startWorking->STARTWORKING),
CUSTOMER = (manager.open->CUST_ARRIVE),manager.open is a shared action in FSP.
Please help.
Thanks.

Answer 1

I think you had taken notify and notifyall in not correct way. According to me you need a another class say HotelManagement which hold the information of state of Manager and customer. This will hold the list of customer which are requsting to be allowed in hotel.So this class has methods like (Please pardon me for choosing some bad names ..I hope you will find some better names).
1. updateStateOfManager() = which allow manager to Update its state. and if state become open it will take each customer from RequsetedCustomer list and call their allowed method. If state become Closed it will take each customer from RequsetedCustomer list and call their removed method.
2. requestfromCustomer()= this method called by customer requesting for entry in hotel. if the state is open it allowed them immediately and kept in RequestedCustomer list too so that they can be removed when manager state changed. and if manager state is closed they are not allowed but kept in RequsetedCustomer list.
3. finshedFromCustomer()= customer done in hotel so remove from RequsetedCustomer list;
You can used AtomicBoolean objects for keeping state of Manager other thread safe data Structure for holding other objects.