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event_bus.go
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event_bus.go
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package golaze
import (
"sync"
)
type EventBusConfig struct {
Subscribers map[string][]EventBusHandler
Shutdown chan bool
lock *sync.RWMutex
}
type EventBusHandler interface {
Handle(event *Event) error
}
type Event struct {
Data interface{}
}
type EventBus struct {
*EventBusConfig
}
func NewEventBus(config *EventBusConfig) *EventBus {
if config.Subscribers == nil {
config.Subscribers = make(map[string][]EventBusHandler)
}
if config.lock == nil {
config.lock = &sync.RWMutex{}
}
return &EventBus{
config,
}
}
func (eb *EventBus) Subscribe(eventType string, handler EventBusHandler) {
eb.lock.Lock()
defer eb.lock.Unlock()
eb.Subscribers[eventType] = append(eb.Subscribers[eventType], handler)
}
func (eb *EventBus) Unsubscribe(eventType string, handler EventBusHandler) {
eb.lock.Lock()
defer eb.lock.Unlock()
if _, ok := eb.Subscribers[eventType]; !ok {
return
}
// Find the handler and remove it from the list
for i, h := range eb.Subscribers[eventType] {
if h == handler {
eb.Subscribers[eventType] = append(eb.Subscribers[eventType][:i], eb.Subscribers[eventType][i+1:]...)
return
}
}
}
func (eb *EventBus) Publish(eventType string, event *Event) {
eb.lock.RLock()
defer eb.lock.RUnlock()
for _, handler := range eb.Subscribers[eventType] {
go func(handler EventBusHandler) {
handler.Handle(event)
}(handler)
}
}