func NewManager(_myId string, _members []string) *Manager {
self := &Manager{
myId: _myId,
members: _members,
votes: make(Votes),
threshold: util.ComputeQuorumThreshold(len(_members)),
C: make(chan bool, 100),
}
self.state = fsm.NewFSM(
"idle",
fsm.Events{
{Name: "quorum", Src: []string{"idle", "elected"}, Dst: "electing"},
{Name: "complete", Src: []string{"electing"}, Dst: "elected"},
{Name: "next", Src: []string{"elected"}, Dst: "idle"},
},
fsm.Callbacks{
"electing": func(e *fsm.Event) { self.onElecting() },
"enter_elected": func(e *fsm.Event) { self.onElected(e.Args[0].(string), e.Args[1].(int64)) },
"leave_elected": func(e *fsm.Event) { self.view++ },
},
)
fmt.Printf("EM: Initializing with %d members and a quorum threshold %d\n", len(self.members), self.threshold)
return self
}
func NewController(_id string, _peers IdentityMap, _connMgr *ConnectionManager) *Controller {
var members []string
for _, peer := range _peers {
members = append(members, peer.Id)
}
self := &Controller{
peers: _peers,
connMgr: _connMgr,
myId: _id,
activePeers: make(map[string]*Peer),
quorumThreshold: util.ComputeQuorumThreshold(len(_peers)) - 1, // We don't include ourselves
timer: time.NewTimer(0),
pulse: time.NewTicker(1),
electionManager: election.NewManager(_id, members),
minTmo: 500,
maxTmo: 1000,
}
<-self.timer.C // drain the initial event
self.pulse.Stop()
<-self.pulse.C // drain the initial event
self.state = fsm.NewFSM(
"convening",
fsm.Events{
{Name: "quorum", Src: []string{"convening"}, Dst: "initializing"},
{Name: "quorum-lost", Src: []string{"initializing", "electing", "electing-restart", "following", "leading"}, Dst: "convening"},
{Name: "elected-self", Src: []string{"initializing", "electing"}, Dst: "leading"},
{Name: "elected-other", Src: []string{"initializing", "electing"}, Dst: "following"},
{Name: "timeout", Src: []string{"initializing", "following", "electing"}, Dst: "electing"},
{Name: "election", Src: []string{"following", "leading"}, Dst: "electing"},
{Name: "heartbeat", Src: []string{"following"}, Dst: "following"},
},
fsm.Callbacks{
"convening": func(e *fsm.Event) { self.onConvening() },
"enter_initializing": func(e *fsm.Event) { self.onInitializing() },
"leave_initializing": func(e *fsm.Event) { self.timer.Stop() },
"enter_following": func(e *fsm.Event) { self.onEnterFollowing() },
"leave_following": func(e *fsm.Event) { self.onLeaveFollowing() },
"enter_electing": func(e *fsm.Event) { self.onElecting() },
"leave_electing": func(e *fsm.Event) { self.timer.Stop() },
"enter_leading": func(e *fsm.Event) { self.onEnterLeading() },
"leave_leading": func(e *fsm.Event) { self.onLeaveLeading() },
"heartbeat": func(e *fsm.Event) { self.onHeartBeat(e.Args[0].(string), e.Args[1].(int64)) },
"before_timeout": func(e *fsm.Event) { self.onTimeout() },
},
)
return self
}
