using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

​

    public class Program

    {

        public static void Main(string[] args)

        {

            Queue<Customer> customerList = new Queue<Customer>();

            customerList.Enqueue(new Customer("Minesh", "G."));

            customerList.Enqueue(new Customer("Pramila", "S."));

            customerList.Enqueue(new Customer("Krish", "G."));

            customerList.Enqueue(new Customer("Manju", "G."));

            customerList.Enqueue(new Customer("Mandita", "G."));

​

            Table table = new Table();

            while (customerList.Count > 0)

            {

                Customer anotherCustomer = customerList.Dequeue();

                anotherCustomer.CustomerEvent += CustomerMeal;

                table.TableEvent += anotherCustomer.OpenTable;

                table.Open();

​

                while (anotherCustomer.lunch != Customer.Lunch.done)

                {

                    Thread.Sleep(1000);

                    anotherCustomer.NextLunch();

                }

​

                table.TableEvent -= anotherCustomer.OpenTable;

            }

​

            Console.WriteLine("Everyone is full!");

            Console.ReadLine();

        }

​

        public static void CustomerMeal(object sender, CustomerInfoEventArgs e)

        {

            Console.WriteLine("{0} {1} is having {2}.", e.customer.fName, e.customer.lName, e.customer.lunch);

        }

    }

​

    public class Customer

    {

        public enum Lunch { none, appetizer, main, desert, done }

        public EventHandler<CustomerInfoEventArgs> CustomerEvent;

​

        public string fName { get; set; }

        public string lName { get; set; }

        public Lunch lunch { get; set; }

​

        public Customer(string _fName, string _lName)

        {

            this.fName = _fName;

            this.lName = _lName;

            this.lunch = Lunch.none;

        }

​

        public void OpenTable(object sender, TableInfoEventArgs e)

        {

            Console.WriteLine("{0} {1} got a table.", this.fName, this.lName);

        }

​

        public void NextLunch()

        {

            EventHandler<CustomerInfoEventArgs> customerMealInfo = CustomerEvent;

​

            switch (this.lunch)

            {

                case Lunch.none:

                    this.lunch = Lunch.appetizer;

                    break;

                case Lunch.appetizer:

                    this.lunch = Lunch.main;

                    break;

                case Lunch.main:

                    this.lunch = Lunch.desert;

                    break;

                case Lunch.desert:

                    this.lunch = Lunch.done;

                    break;

            }

​

            if (customerMealInfo != null)

            {

                customerMealInfo(this, new CustomerInfoEventArgs(this));

            }

        }

​

    }

​

    public class CustomerInfoEventArgs : EventArgs

    {

        public Customer customer { get; private set; }

        public CustomerInfoEventArgs(Customer customer)

        {

            this.customer = customer;

        }

​

    }

​

    public class Table

    {

        public EventHandler<TableInfoEventArgs> TableEvent;

​

        public void Open()

        {

            Console.WriteLine("Table open!");

            EventHandler<TableInfoEventArgs> tableOpenInfo = TableEvent;

            if (tableOpenInfo != null)

            {

                tableOpenInfo(this, new TableInfoEventArgs(this));

            }

        }

    }

​

    public class TableInfoEventArgs : EventArgs

    {

        public Table table { get; private set; }

        public TableInfoEventArgs(Table table)

        {

            this.table = table;

        }

    }

​

​

​

​