Optimizing Performance with Denormalization, Observer Design Pattern and Asynchronous Technique

/// -----------------------------------------------------------------------------
/// Copyright (C) 2009. All rights reserved.
/// <summary>
/// Example with ObserverPattern to foster the low-coupling and synchronize data while using Denormalization to enhance performance
/// </summary>
/// <history>
///     Status    Date         By             Comments
///     ------------------------------------------------------------------------
///     Created   10 Aug 2009  Henry          Created
///     ------------------------------------------------------------------------
/// </history>
/// -----------------------------------------------------------------------------

using System;

namespace ObserverPattern_Test
{
  /// <summary>
  /// The 'ConcreteObserver' class
  /// </summary>
  class SalesPersonObserver : Observer
  {
    private string _name;
    private OrderController _subject;

    // Constructor
    public SalesPersonObserver(OrderController subject, string name)
    {
      this._subject = subject;
      this._name = name;
    }

    public override void Update()
    {
      //YOUR CODE GOES HERE: Send a request to database to update total field for Customer table
      bool updateResult = true;

      if (updateResult) //Updated successfully
      {
          this.State = ObserverState.UPDATE_SUCCESSFUL;

          Console.WriteLine("'Total Sold Amount' for SalesPerson who processed Order {0} has been updated successfully too.", _subject.OrderID);
          Console.WriteLine();
      }
      else
          this.State = ObserverState.UPDATE_FAILED;

      Console.WriteLine("Observer '{0}'s state is '{1}'", _name, this.State);
      Console.WriteLine();
    }

    // Gets or sets subject
    public OrderController Subject
    {
      get { return _subject; }
      set { _subject = value; }
    }

  }

}