Server/service.go

package lucifer3

import (
	"sync/atomic"
)

type Service interface {
	Active() bool
	HandleEvent(bus *EventBus, event Event)
}

type ActiveService interface {
	Service

	HandleCommand(bus *EventBus, command Command)
}

type ServiceCommon struct {
	inactive uint32
}

func (s *ServiceCommon) Active() bool {
	return atomic.LoadUint32(&s.inactive) == 0
}

func (s *ServiceCommon) markInactive() {
	atomic.StoreUint32(&s.inactive, 1)
}

type callbackService struct {
	ServiceCommon
	cb func(event Event) bool
}

func (c *callbackService) HandleEvent(_ *EventBus, event Event) {
	if !c.cb(event) {
		c.markInactive()
	}
}

func newCallbackService(cb func(event Event) bool) Service {
	return &callbackService{
		ServiceCommon: ServiceCommon{
			inactive: 0,
		},
		cb: cb,
	}
}