bump(github.com/goraft/raft): 6bf34b9

Move from coreos/raft to goraft/raft and update to latest.

third_party/github.com/goraft/raft/event.go

@@ -0,0 +1,61 @@
+package raft
+
+const (
+	StateChangeEventType  = "stateChange"
+	LeaderChangeEventType = "leaderChange"
+	TermChangeEventType   = "termChange"
+	CommitEventType   = "commit"
+	AddPeerEventType      = "addPeer"
+	RemovePeerEventType   = "removePeer"
+
+	HeartbeatIntervalEventType        = "heartbeatInterval"
+	ElectionTimeoutThresholdEventType = "electionTimeoutThreshold"
+
+	HeartbeatEventType = "heartbeat"
+)
+
+// Event represents an action that occurred within the Raft library.
+// Listeners can subscribe to event types by using the Server.AddEventListener() function.
+type Event interface {
+	Type() string
+	Source() interface{}
+	Value() interface{}
+	PrevValue() interface{}
+}
+
+// event is the concrete implementation of the Event interface.
+type event struct {
+	typ       string
+	source    interface{}
+	value     interface{}
+	prevValue interface{}
+}
+
+// newEvent creates a new event.
+func newEvent(typ string, value interface{}, prevValue interface{}) *event {
+	return &event{
+		typ:       typ,
+		value:     value,
+		prevValue: prevValue,
+	}
+}
+
+// Type returns the type of event that occurred.
+func (e *event) Type() string {
+	return e.typ
+}
+
+// Source returns the object that dispatched the event.
+func (e *event) Source() interface{} {
+	return e.source
+}
+
+// Value returns the current value associated with the event, if applicable.
+func (e *event) Value() interface{} {
+	return e.value
+}
+
+// PrevValue returns the previous value associated with the event, if applicable.
+func (e *event) PrevValue() interface{} {
+	return e.prevValue
+}