FederationRoutingTokenHeader RoutingToken::SplitPredToken(PartnerNodeSPtr const & pred, uint64 targetVersion,
NodeId const & ownerId)
{
if (pred->Id == ownerId)
{
return FederationRoutingTokenHeader();
}
// This is the boundary that should still belong to the current node.
NodeId splitID = ownerId.GetPredMidPoint(pred->Id);
// This is the bounary that should belong to the neighbor.
NodeId transferID = splitID.PredWalk(LargeInteger::One);
// Split is possible only when the transfer point is within the range.
if (ownerId.PredDist(transferID) > ownerId.PredDist(range_.Begin))
{
return FederationRoutingTokenHeader();
}
// Split current token.
NodeId oldStart = range_.Begin;
Update(NodeIdRange(splitID, range_.End));
return FederationRoutingTokenHeader(NodeIdRange(oldStart, transferID), version_, targetVersion);
}
FederationRoutingTokenHeader RoutingToken::SplitFullToken(PartnerNodeSPtr const & neighbor, uint64 targetVersion,
NodeId const & ownerId)
{
NodeId succMid = ownerId.GetSuccMidPoint(neighbor->Id);
NodeId predMid = ownerId.GetPredMidPoint(neighbor->Id);
Update(NodeIdRange(predMid, succMid));
return FederationRoutingTokenHeader(
NodeIdRange(succMid.SuccWalk(LargeInteger::One), predMid.PredWalk(LargeInteger::One)),
version_, targetVersion);
}