Message exchanging between two or many independent objects

If you don't want A and B to have references to each other, then here's how you could implement a simple message exchange scheme between them using a third 'singleton' class C as a conduit. The code can easily be generalized to 3 or more objects:

using System;

enum MessageType

{

Post,

}

class C

{

private static C c;

public static C GetInstance()

{

if(c == null) c = new C();

return c;

}

private C()

{

}

public Action SendMessage;

public void OnSendMessage(string sender, string[] recipients, string message, MessageType type)

{

if (SendMessage != null)

{

SendMessage(sender, recipients, message, type);

}

class A

{

public A()

{

C.GetInstance().SendMessage += ReceiveMessage;

}

private void ReceiveMessage(string sender, string[] recipients, string message, MessageType type)

{

if (Array.IndexOf(recipients, "A") > - 1)

{

Console.WriteLine("The message : '{0}' received from {1}", message, sender);

if (type == MessageType.Post)

{

SendMessage("A", new string[]{sender}, "Thanks for your message", MessageType.Reply);

}

public void SendMessage(string sender, string[] recipients, string message, MessageType type)

{

C.GetInstance().OnSendMessage(sender, recipients, message, type);

}

class B

{

public B()

{

C.GetInstance().SendMessage += ReceiveMessage;

}

private void ReceiveMessage(string sender, string[] recipients, string message, MessageType type)

{

if (Array.IndexOf(recipients, "B") > - 1)

{

Console.WriteLine("The message : '{0}' received from {1}", message, sender);

if (type == MessageType.Post)

{

SendMessage("B", new string[]{sender}, "Thanks for your message", MessageType.Reply);

}

public void SendMessage(string sender, string[] recipients, string message, MessageType type)

{

C.GetInstance().OnSendMessage(sender, recipients, message, type);

}

class Program

{

static void Main()

{

A a = new A();

B b = new B();

b.SendMessage("B", new string[]{"A"}, "Hello", MessageType.Post);

Console.ReadKey();

}

}

The output is:

The message : 'Hello' received from B

The message : 'Thanks for your message' received from A

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vadim12y ago
Thank you. That is exact what i search
Vulpes12y ago
If you don't want A and B to have references to each other, then here's how you could implement a simple message exchange scheme between them using a third 'singleton' class C as a conduit. The code can easily be generalized to 3 or more objects:

using System;

enum MessageType
{
Post,
}

class C
{
private static C c;

public static C GetInstance()
{
if(c == null) c = new C();
return c;
}

private C()
{
}

public Action SendMessage;

public void OnSendMessage(string sender, string[] recipients, string message, MessageType type)
{
if (SendMessage != null)
{
SendMessage(sender, recipients, message, type);
}
}
}

class A
{
public A()
{
C.GetInstance().SendMessage += ReceiveMessage;
}

private void ReceiveMessage(string sender, string[] recipients, string message, MessageType type)
{
if (Array.IndexOf(recipients, "A") > - 1)
{
Console.WriteLine("The message : '{0}' received from {1}", message, sender);
if (type == MessageType.Post)
{
SendMessage("A", new string[]{sender}, "Thanks for your message", MessageType.Reply);
}
}
}

public void SendMessage(string sender, string[] recipients, string message, MessageType type)
{
C.GetInstance().OnSendMessage(sender, recipients, message, type);
}
}

class B
{
public B()
{
C.GetInstance().SendMessage += ReceiveMessage;
}

private void ReceiveMessage(string sender, string[] recipients, string message, MessageType type)
{
if (Array.IndexOf(recipients, "B") > - 1)
{
Console.WriteLine("The message : '{0}' received from {1}", message, sender);
if (type == MessageType.Post)
{
SendMessage("B", new string[]{sender}, "Thanks for your message", MessageType.Reply);
}
}
}

public void SendMessage(string sender, string[] recipients, string message, MessageType type)
{
C.GetInstance().OnSendMessage(sender, recipients, message, type);
}

}

class Program
{
static void Main()
{
A a = new A();
B b = new B();
b.SendMessage("B", new string[]{"A"}, "Hello", MessageType.Post);
Console.ReadKey();
}
}

The output is:

The message : 'Hello' received from B
The message : 'Thanks for your message' received from A