Give n number of underground bunkers (some online and some offline), write code to desseminate your message to other nodes and desseminate messages from other nodes to other nodes without forming a cycle. Online nodes forward messages when received, offline nodes are abandoned and no messages are forwarded.

e.g.

A --> B --> C --> E
            |    |
			D -->F-->G

write code that could be run on all sites, and could propagate messages without forming a cycle.

The following template is provided, interviewee is expected to fill in the blanks:

public class Transceiver {
   public class Message {
   ...
   }
   public void receive(Message message) {
   ...
   }
   public void send(Message message) {
   ...
   }
}

Assume all nodes run updated code immediately. Solution must propagate messagaes to all nodes without getting in infinite loop.