Moved filter to events

event/filter/filter.go

@@ -0,0 +1,70 @@
+package filter
+
+import "reflect"
+
+type Filter interface {
+	Compare(Filter) bool
+	Trigger(data interface{})
+}
+
+type FilterEvent struct {
+	filter Filter
+	data   interface{}
+}
+
+type Filters struct {
+	id       int
+	watchers map[int]Filter
+	ch       chan FilterEvent
+
+	quit chan struct{}
+}
+
+func New() *Filters {
+	return &Filters{
+		ch:       make(chan FilterEvent),
+		watchers: make(map[int]Filter),
+		quit:     make(chan struct{}),
+	}
+}
+
+func (self *Filters) Start() {
+	go self.loop()
+}
+
+func (self *Filters) Stop() {
+	close(self.quit)
+}
+
+func (self *Filters) Notify(filter Filter, data interface{}) {
+	self.ch <- FilterEvent{filter, data}
+}
+
+func (self *Filters) Install(watcher Filter) int {
+	self.watchers[self.id] = watcher
+	self.id++
+
+	return self.id - 1
+}
+
+func (self *Filters) Uninstall(id int) {
+	delete(self.watchers, id)
+}
+
+func (self *Filters) loop() {
+out:
+	for {
+		select {
+		case <-self.quit:
+			break out
+		case event := <-self.ch:
+			for _, watcher := range self.watchers {
+				if reflect.TypeOf(watcher) == reflect.TypeOf(event.filter) {
+					if watcher.Compare(event.filter) {
+						watcher.Trigger(event.data)
+					}
+				}
+			}
+		}
+	}
+}