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registry.go
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registry.go
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package registry
import (
"context"
"reflect"
"sort"
)
type Descriptor struct {
Name string
Instance Service
InitPriority Priority
}
var services []*Descriptor
func RegisterService(instance Service) {
services = append(services, &Descriptor{
Name: reflect.TypeOf(instance).Elem().Name(),
Instance: instance,
InitPriority: Low,
})
}
func Register(descriptor *Descriptor) {
services = append(services, descriptor)
}
func GetServices() []*Descriptor {
sort.Slice(services, func(i, j int) bool {
return services[i].InitPriority > services[j].InitPriority
})
return services
}
type Service interface {
Init() error
}
// Useful for alerting service
type CanBeDisabled interface {
IsDisabled() bool
}
type BackgroundService interface {
Run(ctx context.Context) error
}
type HasInitPriority interface {
GetInitPriority() Priority
}
func IsDisabled(srv Service) bool {
canBeDisabled, ok := srv.(CanBeDisabled)
return ok && canBeDisabled.IsDisabled()
}
type Priority int
const (
High Priority = 100
Low Priority = 0
)