private static void ChainOfResponsability()
{
try
{
// Setup Chain of Responsibility
Approver director = new Director();
Approver vicePresidente = new VicePresident();
Approver presidente = new President();
director.SetSuccessor(vicePresidente);
vicePresidente.SetSuccessor(presidente);
// Generate and process purchase requests
Purchase p = new Purchase(2034, 350.00, "Assets");
director.ProcessRequest(p);
p = new Purchase(2035, 72590.10, "Project X");
director.ProcessRequest(p);
p = new Purchase(2036, 122100.00, "Project Y");
director.ProcessRequest(p);
// Wait for user
Console.ReadKey();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
static void Main(string[] args)
{
#region Decorator - Using Composition to limit inheritance and simplify object relationships easier to maintain and manage.
//Inside ConcreteDecorator any number of features can be added to the car and price for the car can be updated.
Decorator.Component.Car sampleCar = new CompactCar();
sampleCar = new LeatherSeats(sampleCar);
Console.WriteLine(sampleCar.GetDescription());
Console.WriteLine($"{sampleCar.GetCarPrice():C2}");
#endregion
#region Observer - Change in one object causes a change or action in another.
var trump = new Trump("I love my wife");
var firstFan = new Fan("Rohit");
var secondFan = new Fan("Ram");
trump.AddFollower(firstFan);
trump.AddFollower(secondFan);
trump.Tweet = "I hate media";
#endregion
#region Builder Pattern- Separate and reuse a specific process to build an object /use when constructing a complex object
//Director- construct ()
//Builder - Build part
//CarBuilder to construct two types of cars
//override the method of building a car in separate classes which derive from an abstract carbuilder
//create a list of carbuilder objects to specify the current known types of cars that can be built
//create a factory
var superBuilder = new SuperCarBuilder();
var notSoSsuperBuilder = new NotSoSuperCarBuilder();
var factory = new CarFactory();
var builders = new List <CarBuilder> {
superBuilder, notSoSsuperBuilder
};
foreach (var b in builders)
{
var c = factory.Build(b);
Console.WriteLine($"The car requested by " + $"{b.GetType().Name}:" + Environment.NewLine
+ $"Horse Power: {c.HorsePower}" + Environment.NewLine
+ $"Impressive feature: {c.MostImpressiveFeature}" + Environment.NewLine
+ $"Top speed: {c.TopSpeedMPH} mph" + Environment.NewLine);
}
#endregion
#region Bridge Pattern- Used to separate an abstraction from its implementation so both can be modified independently
//Sending messages from sms or service without each affecting the other
IMessageSender text = new TextSender();
IMessageSender web = new WebServiceSender();
Message message = new SystemMessage(text);
message.Subject = "A message";
message.Body = "hi there, please know this";
message.MessageSender = text;
message.Send();
message.MessageSender = web;
message.Send();
#endregion
#region Chain of responsibility- Chain the receiving objects and pass the request along the chain until an object handles it.
//Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request
Approver Bobby = new Director();
Approver Sunny = new VicePresident();
Approver Dharam = new President();
Bobby.SetSuccessor(Sunny);
Sunny.SetSuccessor(Dharam);
Purchase P = new Purchase()
{
Amount = 10000, Number = 1
};
Bobby.ProcessRequest(P);
#endregion
#region Command - Wrap request as an object to be implemented later or invoke at different points in time.
//Encapsulate a request as an object, thereby letting you parameterize clients with different requests -queue or log and support undoable operations
//Use an object to store required information to perform an action at any point in time.
var user = new User();
user.Compute('+', 100);
user.Compute('-', 50);
user.Compute('*', 10);
user.Compute('/', 2);
//undo
user.Undo(4);
//Redo
user.Redo(3);
#endregion
Console.ReadLine();
}