// This becomes has the same signature as the MessageReceivedHandler delegate and so can
// be attached; hooked; follow; subscribe to the server event.
// Since nothing other than the types in the assembly should use this handler, we make it internal.
internal void RelayMessage(int sender, NewMessageEventArgs e)
{
// The sender is this instance, we don't need to care about the message or event
if (sender == id)
{
return;
}
// Since we are just sending a message like normal, we can just use the method that
// is used to send the messages normally.
SendMessage(e.Message.Value);
}
// Through this method, we can fire the event in a thread safe manor from everywhere inside the class.
private void IncommingMessage(NewMessageEventArgs e)
{
lock (messageReceivedEventPadlock) {
// When the server is notified it will raise its own event with the same message and id.
MessageReceivedEvent?.Invoke(id, e);
// ?. is called a null conditional operator.
// If the target (here, messageReceivedEvent) is null, it returns null
// Otherwise it calls the specified member.
// In normal syntax this is (explicitely):
// MessageReceivedHandler handler = messageReceivedEvent;
// if (handler == null) return null;
// else return messageReceivedEvent.Invoke(id, new NewMessageEventArgs(message));
// For this case it would be:
// MessageReceivedHandler handler = messageReceivedEvent;
// if (handler != null) messageReceivedEvent.Invoke(id, new NewMessageEventArgs(message));
// as returns from operators are ignored the value is not assigned to anything.
}
}