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// Package eventbus представляет собой асинхронную шину событий
package eventbus
import (
"strings"
"sync"
)
const (
defaultCapacity = 32
)
type bus struct {
noCopy
listeners node[Listener]
nameSeparator string
wildcard string
}
func New(opts ...Opt) *bus {
b := &bus{
nameSeparator: ".",
wildcard: "*",
}
for _, o := range opts {
o.Apply(b)
}
if cap(b.listeners.values) == 0 {
b.listeners = node[Listener]{
children: make(map[string]*node[Listener], defaultCapacity),
values: make([]Listener, 0, defaultCapacity),
}
}
return b
}
type Listener chan Event
type Event interface {
Event() string
}
func (b *bus) Subscribe(path string) Listener {
splitedPath := strings.Split(path, b.nameSeparator)
ch := make(Listener, 1)
b.listeners.Put(splitedPath, ch)
return ch
}
func (b *bus) Unsubscribe(l Listener) {
close(l)
b.listeners.Remove(l)
}
func (b *bus) Close() {
b.listeners.Clear(func(value Listener) {
close(value)
})
}
func (b *bus) Fire(ev Event) {
splitedEventName := strings.Split(ev.Event(), b.nameSeparator)
listeners := b.listeners.Get(splitedEventName, b.wildcard)
wg := sync.WaitGroup{}
for _, l := range listeners {
wg.Go(func() {
select {
case l <- ev:
default:
}
})
}
wg.Wait()
}
type noCopy struct{}
func (*noCopy) Lock() {}
func (*noCopy) Unlock() {}
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