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service.go
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service.go
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package service
import (
"errors"
"sync/atomic"
)
var (
ErrOperating = errors.New("service is operating")
ErrStarted = errors.New("service is started")
ErrStopped = errors.New("service is stopped")
)
type Service interface {
Start() error
OnStart() error
Stop() error
OnStop() error
Started() bool
Name() string
}
type BaseService struct {
service Service
started int32
operating int32
name string
}
func NewBaseService(service Service, name string) *BaseService {
return &BaseService{
service: service,
name: name,
}
}
func (bs *BaseService) Start() error {
if swapped := atomic.CompareAndSwapInt32(&bs.operating, 0, 1); !swapped {
return ErrOperating
}
defer atomic.StoreInt32(&bs.operating, 0)
if atomic.LoadInt32(&bs.started) == 1 {
return ErrStarted
}
if err := bs.service.OnStart(); err != nil {
return err
}
atomic.StoreInt32(&bs.started, 1)
return nil
}
func (bs *BaseService) OnStart() error {
return nil
}
func (bs *BaseService) Stop() error {
if swapped := atomic.CompareAndSwapInt32(&bs.operating, 0, 1); !swapped {
return ErrOperating
}
defer atomic.StoreInt32(&bs.operating, 0)
if atomic.LoadInt32(&bs.started) == 0 {
return ErrStopped
}
if err := bs.service.OnStop(); err != nil {
return err
}
atomic.StoreInt32(&bs.started, 0)
return nil
}
func (bs *BaseService) OnStop() error {
return nil
}
func (bs *BaseService) Started() bool {
return atomic.LoadInt32(&bs.started) == 1
}
func (bs *BaseService) Name() string {
return bs.name
}