Network simulation with threads

• One live master, two standby masters listening if there is a live master.
• Live master broadcasts every second that he is alive (hearbeat)
• If standby masters do not get heartbeat for 10 seconds, one of them randomly becomes new live master
• Optional: Gossip protocol: One standby might get the heartbear while the other can't. In that case the one that gets the hearbeat refuses the request of the other to become live master.
• Master distributes jobs to worker nodes.
• Worker nodes tell master every second that they are alive
• Worker nodes return with an answer when their job finishes. Note that job might take more than 1 second. We need one thread for heartbeat and one thread for job processing.
• GUI: Show live master, standby masters, working nodes, idle nodes, offline nodes.