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goob.go
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goob.go
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package goob
import (
"context"
"sync"
)
// Observable hub
type Observable struct {
ctx context.Context
lock *sync.Mutex
subscribers map[Events]func(Event)
}
// New observable instance
func New(ctx context.Context) *Observable {
ob := &Observable{
ctx: ctx,
lock: &sync.Mutex{},
subscribers: map[Events]func(Event){},
}
return ob
}
// Publish message to the queue
func (ob *Observable) Publish(e Event) {
ob.lock.Lock()
defer ob.lock.Unlock()
for _, write := range ob.subscribers {
write(e)
}
}
// Subscribe message
func (ob *Observable) Subscribe(ctx context.Context) Events {
ob.lock.Lock()
defer ob.lock.Unlock()
ctx, cancel := context.WithCancel(ctx)
write, events := NewPipe(ctx)
ob.subscribers[events] = write
go func() {
select {
case <-ctx.Done():
case <-ob.ctx.Done():
}
ob.lock.Lock()
defer ob.lock.Unlock()
delete(ob.subscribers, events)
cancel()
}()
return events
}
// Len of the subscribers
func (ob *Observable) Len() int {
ob.lock.Lock()
defer ob.lock.Unlock()
return len(ob.subscribers)
}