50 lines
962 B
Go
50 lines
962 B
Go
package builtin
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import (
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"sync"
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"github.com/drone/drone/eventbus"
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)
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type EventBus struct {
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sync.Mutex
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subs map[chan *eventbus.Event]bool
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}
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// New creates a new EventBus that manages a list of
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// subscribers to which events are published.
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func New() *EventBus {
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return &EventBus{
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subs: make(map[chan *eventbus.Event]bool),
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}
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}
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// Subscribe adds the channel to the list of
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// subscribers. Each subscriber in the list will
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// receive broadcast events.
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func (b *EventBus) Subscribe(c chan *eventbus.Event) {
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b.Lock()
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b.subs[c] = true
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b.Unlock()
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}
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// Unsubscribe removes the channel from the
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// list of subscribers.
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func (b *EventBus) Unsubscribe(c chan *eventbus.Event) {
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b.Lock()
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delete(b.subs, c)
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b.Unlock()
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}
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// Send dispatches a message to all subscribers.
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func (b *EventBus) Send(event *eventbus.Event) {
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b.Lock()
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defer b.Unlock()
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for s := range b.subs {
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go func(c chan *eventbus.Event) {
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defer recover()
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c <- event
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}(s)
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}
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}
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