public boolean shouldNotifyReachabilityUpdateReceivers(String nodeId,boolean isReachable){
  Boolean currentReachability=nodeReachabilities.get(nodeId);
  if (currentReachability == null) {
    return true;
  }
  return currentReachability.booleanValue() != isReachable;
}

public boolean shouldNotifyReachabilityUpdateReceivers ( String nodeId , boolean isReachable ) { Boolean currentReachability = nodeReachabilities . get ( nodeId ) ; if ( currentReachability == null ) { return true ; } return currentReachability . booleanValue ( ) != isReachable ; }
returns true if the reachability for the specified node has changed
