private int ProcessRequestVoteResult(RequestVote rpc, Connector c)
{
lock (this)
{
if (LogSequence.TrySetTerm(rpc.Result.Term))
{
// new term found
ConvertStateTo(RaftState.Follower);
return(Procedure.Success);
}
}
if (rpc.Result.VoteGranted && VoteSuccess.TryAdd(c.Name, c))
{
lock (this)
{
if (
// 确保当前状态是选举中。没有判断这个，
// 后面 ConvertStateTo 也会忽略不正确的状态转换。
State == RaftState.Candidate
// 加上自己就是多数派了。
&& VoteSuccess.Count >= RaftConfig.HalfCount)
{
ConvertStateTo(RaftState.Leader);
}
}
}
return(Procedure.Success);
}
private void SendRequestVote(SchedulerTask ThisTask)
{
lock (this)
{
VoteSuccess.Clear(); // 每次选举开始清除。
LeaderId = string.Empty;
LogSequence.SetVoteFor(Name); // Vote Self First.
LogSequence.TrySetTerm(LogSequence.Term + 1);
WaitMajorityVoteTimoutTask?.Cancel();
WaitMajorityVoteTimoutTask = null;
var arg = new RequestVoteArgument();
arg.Term = LogSequence.Term;
arg.CandidateId = Name;
var log = LogSequence.LastRaftLog();
arg.LastLogIndex = log.Index;
arg.LastLogTerm = log.Term;
Server.Config.ForEachConnector(
(c) =>
{
if (false == c.IsHandshakeDone)
{
return;
}
var rpc = new RequestVote()
{
Argument = arg
};
rpc.Send(c.Socket, (p) => ProcessRequestVoteResult(rpc, c));
logger.Debug("{0}: SendRequestVote {1}", Name, rpc);
});
// 定时，如果超时选举还未完成，再次发起选举。
WaitMajorityVoteTimoutTask = Scheduler.Instance.Schedule(
(ThisTask) =>
{
lock (this)
{
StartRequestVoteDelayTask = null;
ConvertStateTo(RaftState.Candidate);
}
},
RaftConfig.AppendEntriesTimeout + 1000);
}
}
