func (this *Paxos) doRestoreLearner(state *thispb.LearnerState) {
if state.ChosenValue != nil {
this.chosenValue = state.GetChosenValue()
return
}
for index := range state.VotedBallotList {
ballot := state.VotedBallotList[index]
value := state.VotedValueList[index]
acceptor := state.VotedAcceptorList[index]
// Ballot numbers can repeat in the list, but corresponding value is stored
// only once. So, we may find nils in the state.VotedValueList.
if value != nil {
this.ballotValueMap[ballot] = value
}
acceptorSet, found := this.ballotAcceptorsMap[ballot]
if !found {
acceptorSet = make(map[string]struct{})
this.ballotAcceptorsMap[ballot] = acceptorSet
}
acceptorSet[acceptor] = struct{}{}
}
}
func (this *Paxos) doSaveLearner(state *thispb.LearnerState) {
if this.chosenValue != nil {
state.ChosenValue = append([]byte{}, this.chosenValue...)
return
}
for ballot, acceptorSet := range this.ballotAcceptorsMap {
votedValue := append([]byte{}, this.ballotValueMap[ballot]...)
for acceptor := range acceptorSet {
state.VotedBallotList = append(state.VotedBallotList, ballot)
state.VotedAcceptorList = append(state.VotedAcceptorList, acceptor)
state.VotedValueList = append(state.VotedValueList, votedValue)
// Store only one copy of the ballot value for each unique ballot.
votedValue = nil
}
}
}