func BallotAccumulatorFromData(txnId *common.TxnId, txn *msgs.Txn, outcome *outcomeEqualId, instances *msgs.InstancesForVar_List) *BallotAccumulator {
ba := NewBallotAccumulator(txnId, txn)
ba.outcome = outcome
for idx, l := 0, instances.Len(); idx < l; idx++ {
// All instances that went to disk must be complete. But in the
// case of a retry, not all instances must be complete before
// going to disk.
ba.incompleteVars--
instancesForVar := instances.At(idx)
acceptedInstances := instancesForVar.Instances()
vUUId := common.MakeVarUUId(instancesForVar.VarId())
vBallot := ba.vUUIdToBallots[*vUUId]
rmBals := rmBallots(make([]*rmBallot, acceptedInstances.Len()))
vBallot.rmToBallot = rmBals
for idy, m := 0, acceptedInstances.Len(); idy < m; idy++ {
acceptedInstance := acceptedInstances.At(idy)
ballot := acceptedInstance.Ballot()
rmBal := &rmBallot{
instanceRMId: common.RMId(acceptedInstance.RmId()),
ballot: eng.BallotFromCap(&ballot),
roundNumber: paxosNumber(acceptedInstance.RoundNumber()),
}
rmBals[idy] = rmBal
}
result := instancesForVar.Result()
vBallot.result = eng.BallotFromCap(&result)
}
return ba
}
// For every vUUId involved in this txn, we should see fInc * ballots:
// one from each RM voting for each vUUId. rmId is the paxos
// instanceRMId.
func (ba *BallotAccumulator) BallotReceived(instanceRMId common.RMId, inst *instance, vUUId *common.VarUUId, txn *msgs.Txn) *outcomeEqualId {
if isDeflated(ba.Txn) && !isDeflated(txn) {
ba.Txn = txn
}
vBallot := ba.vUUIdToBallots[*vUUId]
if vBallot.rmToBallot == nil {
vBallot.rmToBallot = rmBallots(make([]*rmBallot, 0, vBallot.voters))
}
ballot := eng.BallotFromCap(inst.accepted)
found := false
for idx, rBal := range vBallot.rmToBallot {
if found = rBal.instanceRMId == instanceRMId; found {
vBallot.rmToBallot[idx].ballot = ballot
break
}
}
if !found {
rmBal := &rmBallot{
instanceRMId: instanceRMId,
ballot: ballot,
roundNumber: inst.acceptedNum,
}
vBallot.rmToBallot = append(vBallot.rmToBallot, rmBal)
if len(vBallot.rmToBallot) == vBallot.voters {
ba.incompleteVars--
}
if len(vBallot.rmToBallot) >= vBallot.voters {
vBallot.rmToBallot.Sort()
}
}
if len(vBallot.rmToBallot) >= vBallot.voters {
vBallot.result = nil
ba.dirty = true
}
return ba.determineOutcome()
}
