/*
* The mediator allows only registered users
* to communicate each other and post messages
* successfully. So, the following method
* checks whether both the sender and receiver
* are registered users or not.
*/
public void Send(AbstractFriend fromFriend, AbstractFriend toFriend, string msg)
{
/* Verifying whether the sender is a registered user or not. */
if (participants.Contains(fromFriend))
{
/* Verifying whether the receiver is a registered user and he is online.*/
if (participants.Contains(toFriend) && toFriend.Status == "On")
{
Console.WriteLine($"\n[{fromFriend.Name}] posts: {msg}Last message posted {DateTime.Now}");
System.Threading.Thread.Sleep(1000);
/*Target receiver will receive this message.*/
toFriend.ReceiveMessage(fromFriend, msg);
}
else
{
Console.WriteLine($"\n{fromFriend.Name},at this moment,you cannot send message to {toFriend.Name} because he is either not a registered user or he is currently offline.");
}
}
//Message sender is NOT a registered user.
else
{
Console.WriteLine($"\nAn outsider named {fromFriend.Name} of [{fromFriend.GetType()}] is trying to send a message to {toFriend.Name}.");
}
}
public void ReceiveMessage(AbstractFriend fromFriend, string msg)
{
Console.WriteLine($"{this.Name} has received a message from {fromFriend.Name} saying: {msg} ");
}
public void SendMessage(AbstractFriend toFriend, string msg)
{
mediator.Send(this, toFriend, msg);
}
public void Register(AbstractFriend friend)
{
participants.Add(friend);
}
