forked from coreos/fleet
/
bus.go
66 lines (56 loc) · 1.64 KB
/
bus.go
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package event
import (
"fmt"
"reflect"
log "github.com/coreos/fleet/third_party/github.com/golang/glog"
"github.com/coreos/fleet/machine"
)
type EventBus struct {
listeners map[string]EventListener
Channel chan *Event
stop chan bool
}
func NewEventBus() *EventBus {
listeners := make(map[string]EventListener, 0)
return &EventBus{listeners, make(chan *Event), make(chan bool)}
}
func (self *EventBus) Listen() {
go func() {
for {
select {
case <-self.stop:
return
case ev := <-self.Channel:
self.dispatch(ev)
}
}
}()
}
func (self *EventBus) Stop() {
log.V(1).Info("Stopping EventBus")
close(self.stop)
}
func (self *EventBus) AddListener(name string, m *machine.Machine, l interface{}) {
listener := EventListener{m, l}
key := fmt.Sprintf("%s-%s", name, m.String())
self.listeners[key] = listener
}
func (self *EventBus) RemoveListener(name string, m *machine.Machine) {
key := fmt.Sprintf("%s-%s", name, m.String())
if _, ok := self.listeners[key]; ok {
delete(self.listeners, key)
}
}
// Distribute an Event to all listeners registered to Event.Type
func (self *EventBus) dispatch(ev *Event) {
log.V(2).Infof("Dispatching %s to listeners", ev.Type)
handlerFuncName := fmt.Sprintf("Handle%s", ev.Type)
for _, listener := range self.listeners {
log.V(2).Infof("Looking for event handler func %s on listener %s", handlerFuncName, listener.String())
handlerFunc := reflect.ValueOf(listener.Handler).MethodByName(handlerFuncName)
if handlerFunc.IsValid() {
log.V(2).Infof("Calling event handler for %s on listener %s", ev.Type, listener.String())
go handlerFunc.Call([]reflect.Value{reflect.ValueOf(*ev)})
}
}
}