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watcher.go
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watcher.go
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package curator
import (
"sync"
"github.com/samuel/go-zookeeper/zk"
)
type Watcher interface {
process(event *zk.Event)
}
type simpleWatcher struct {
Func func(event *zk.Event)
}
func NewWatcher(fn func(event *zk.Event)) Watcher {
return &simpleWatcher{fn}
}
func (w *simpleWatcher) process(event *zk.Event) {
w.Func(event)
}
type Watchers struct {
lock sync.Mutex
watchers []Watcher
}
func NewWatchers(watchers ...Watcher) *Watchers {
return &Watchers{watchers: watchers}
}
func (w *Watchers) Len() int { return len(w.watchers) }
func (w *Watchers) Add(watcher Watcher) Watcher {
w.lock.Lock()
w.watchers = append(w.watchers, watcher)
w.lock.Unlock()
return watcher
}
func (w *Watchers) Remove(watcher Watcher) Watcher {
w.lock.Lock()
defer w.lock.Unlock()
for i, v := range w.watchers {
if v == watcher {
w.watchers = append(w.watchers[:i], w.watchers[i+1:]...)
return watcher
}
}
return nil
}
func (w *Watchers) Fire(event *zk.Event) {
for _, watcher := range w.watchers {
if watcher != nil {
go watcher.process(event)
}
}
}
func (w *Watchers) Watch(events <-chan zk.Event) {
for {
if event, ok := <-events; !ok {
break
} else {
w.Fire(&event)
}
}
}