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package serf
type coalesceEvent struct {
Type EventType
Member *Member
}
type memberEventCoalescer struct {
lastEvents map[string]EventType
latestEvents map[string]coalesceEvent
}
func (c *memberEventCoalescer) Handle(e Event) bool {
switch e.EventType() {
case EventMemberJoin:
return true
case EventMemberLeave:
return true
case EventMemberFailed:
return true
case EventMemberUpdate:
return true
case EventMemberReap:
return true
default:
return false
}
}
func (c *memberEventCoalescer) Coalesce(raw Event) {
e := raw.(MemberEvent)
for _, m := range e.Members {
c.latestEvents[m.Name] = coalesceEvent{
Type: e.Type,
Member: &m,
}
}
}
func (c *memberEventCoalescer) Flush(outCh chan<- Event) {
// Coalesce the various events we got into a single set of events.
events := make(map[EventType]*MemberEvent)
for name, cevent := range c.latestEvents {
previous, ok := c.lastEvents[name]
// If we sent the same event before, then ignore
// unless it is a MemberUpdate
if ok && previous == cevent.Type && cevent.Type != EventMemberUpdate {
continue
}
// Update our last event
c.lastEvents[name] = cevent.Type
// Add it to our event
newEvent, ok := events[cevent.Type]
if !ok {
newEvent = &MemberEvent{Type: cevent.Type}
events[cevent.Type] = newEvent
}
newEvent.Members = append(newEvent.Members, *cevent.Member)
}
// Send out those events
for _, event := range events {
outCh <- *event
}
}
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