fzf/src/eventbox.go

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package fzf
import "sync"
type EventType int
type Events map[EventType]interface{}
type EventBox struct {
events Events
cond *sync.Cond
ignore map[EventType]bool
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}
func NewEventBox() *EventBox {
return &EventBox{
events: make(Events),
cond: sync.NewCond(&sync.Mutex{}),
ignore: make(map[EventType]bool)}
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}
func (b *EventBox) Wait(callback func(*Events)) {
b.cond.L.Lock()
defer b.cond.L.Unlock()
if len(b.events) == 0 {
b.cond.Wait()
}
callback(&b.events)
}
func (b *EventBox) Set(event EventType, value interface{}) {
b.cond.L.Lock()
defer b.cond.L.Unlock()
b.events[event] = value
if _, found := b.ignore[event]; !found {
b.cond.Broadcast()
}
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}
// Unsynchronized; should be called within Wait routine
func (events *Events) Clear() {
for event := range *events {
delete(*events, event)
}
}
func (b *EventBox) Peak(event EventType) bool {
b.cond.L.Lock()
defer b.cond.L.Unlock()
_, ok := b.events[event]
return ok
}
func (b *EventBox) Watch(events ...EventType) {
b.cond.L.Lock()
defer b.cond.L.Unlock()
for _, event := range events {
delete(b.ignore, event)
}
}
func (b *EventBox) Unwatch(events ...EventType) {
b.cond.L.Lock()
defer b.cond.L.Unlock()
for _, event := range events {
b.ignore[event] = true
}
}