58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package serverevents
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import (
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"fmt"
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di "git.apihub24.de/admin/generic-di"
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"sync"
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)
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func init() {
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di.Injectable(newEventHandlerRegistration)
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}
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type IEventHandlerRegistration interface {
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Add(eventType string, creator func() IEventHandler)
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GetHandler(eventType string) (IEventHandler, error)
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}
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type eventHandlerRegistration struct {
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creators map[string]func() IEventHandler
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instances map[string]IEventHandler
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mutex sync.RWMutex
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}
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func newEventHandlerRegistration() IEventHandlerRegistration {
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return &eventHandlerRegistration{
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creators: make(map[string]func() IEventHandler),
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instances: make(map[string]IEventHandler),
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mutex: sync.RWMutex{},
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}
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}
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func (registration *eventHandlerRegistration) Add(eventType string, creator func() IEventHandler) {
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registration.mutex.Lock()
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defer registration.mutex.Unlock()
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if _, ok := registration.instances[eventType]; ok {
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delete(registration.instances, eventType)
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}
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if _, ok := registration.creators[eventType]; ok {
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delete(registration.creators, eventType)
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}
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registration.creators[eventType] = creator
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}
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func (registration *eventHandlerRegistration) GetHandler(eventType string) (IEventHandler, error) {
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registration.mutex.RLock()
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defer registration.mutex.RUnlock()
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if creator, ok := registration.creators[eventType]; ok {
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if instance, ok := registration.instances[eventType]; ok {
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return instance, nil
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}
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registration.instances[eventType] = creator()
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return registration.instances[eventType], nil
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}
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return nil, fmt.Errorf("no instance of IEventHandler registered for Event %s! please call Registration Add in a init function to register your EventHandler", eventType)
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}
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