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registry.go
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/
registry.go
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package event
import (
"errors"
"sync"
"github.com/VSBLTY-Inc/core/support/log"
)
var emitters = make(map[string]*Emitter)
var emittersMutex = &sync.RWMutex{}
//todo do we need to dynamically add/remove listeners at runtime? If not, we can remove all locking
// Registers listener for given event types
func RegisterListener(name string, listener Listener, eventTypes []string) error {
if name == "" {
return errors.New("event listener name must be specified")
}
if listener == nil {
return errors.New("event listener must not nil")
}
if len(eventTypes) == 0 {
return errors.New("at least one event type must be provided")
}
emittersMutex.Lock()
for _, eType := range eventTypes {
emitter, ok := emitters[eType]
if !ok {
emitter = &Emitter{eventType: eType, mutex: &sync.RWMutex{}, listeners: make(map[string]Listener)}
emitters[eType] = emitter
}
err := emitter.RegisterListener(name, listener)
if err != nil {
log.RootLogger().Debugf("Event listener - '%s' successfully registered for event type - '%s'", name, eType)
}
}
emittersMutex.Unlock()
startPublisherRoutine()
return nil
}
// Unregister event listener for given event types .
// To unregister from all event types, set eventTypes to nil
func UnRegisterListener(name string, eventTypes []string) {
if name == "" || len(emitters) == 0 {
return
}
//unregister doesn't remove emitter, so no lock is required
if len(eventTypes) > 0 {
for _, eventType := range eventTypes {
if emitter, ok := emitters[eventType]; ok {
err := emitter.UnRegisterListener(name)
if err != nil {
log.RootLogger().Debugf("Event listener - '%s' successfully unregistered for event type - '%s'", name, eventType)
}
}
}
} else {
//unregister from all emitters
for _, emitter := range emitters {
err := emitter.UnRegisterListener(name)
if err != nil {
log.RootLogger().Debugf("Event listener - '%s' successfully unregistered for event type - '%s'", name, emitter.eventType)
}
}
}
stopPublisherRoutine()
}
func HasListener(eventType string) bool {
emittersMutex.RLock()
emitter, ok := emitters[eventType]
emittersMutex.RUnlock()
if ok {
return emitter.HasListeners()
}
return false
}