anchor.diff:      %% Schedule periodic.
       schedule_periodic(),
   
  +    %% Schedule distance metric.
  +    schedule_distance(),
  +
       %% Schedule periodic connections.
       schedule_connections(),
   
  
positive.code:     schedule_tree_refresh(),
  
      {noreply, State#state{out_links=OutLinks}};
  
  handle_info(periodic, #state{pending=Pending,
                               membership_strategy=MembershipStrategy,
  
negative.code:     MembershipStrategy = partisan_config:get(membership_strategy),
      {ok, Membership, MembershipStrategyState} = MembershipStrategy:init(Actor),
  
      DistanceMetrics = dict:new(),
  
      {ok, #state{actor=Actor,
                  pending=[],
                  vclock=VClock,
                  interposition_funs=dict:new(),
                  connections=Connections,
                  distance_metrics=DistanceMetrics,
                  sync_joins=[],
                  up_functions=dict:new(),
                  down_functions=dict:new(),
  