...
Protocol object exposes:
- HandleVote(0, "foo", Vote(1, 2)), HandleMessage, etc. to users
But these are boiler-plate methods provided by the protocol writers; internally,
this method must dispatch to a parent protocol act method. This act method
then finds the right nodes.
Protocols can be initialized with whatever arguments, including topology type, number of nodes, etc. They then can return a topology object so that the topology can be visualized.