diff --git a/pkg/rule_engine/rule_engine.go b/pkg/rule_engine/rule_engine.go
new file mode 100644
index 0000000..c5fdad3
--- /dev/null
+++ b/pkg/rule_engine/rule_engine.go
@@ -0,0 +1,76 @@
+package rule_engine
+
+import (
+	"context"
+	"time"
+)
+
+const (
+	UPDATE_RULE_STATUS_START = "start"
+	UPDATE_RULE_STATUS_STOP  = "stop"
+)
+
+//RuleEngine RuleEngine
+type RuleEngine struct {
+	Name         string
+	ID           string
+	Description  string
+	DebugMode    bool
+	Status       string
+	Payload      []byte
+	Root         bool
+	Channel      string
+	SubTopic     string
+	CreateAt     time.Time
+	LastUpdateAt time.Time
+}
+
+type PageMetadata struct {
+	Total  uint64
+	Offset uint64
+	Limit  uint64
+	Name   string
+}
+
+type RuleEnginePage struct {
+	PageMetadata
+	RuleChains []RuleEngine
+}
+
+// Validate returns an error if representtation is invalid
+func (r RuleEngine) Validate() error {
+	if r.ID == "" {
+		return ErrMalformedEntity
+	}
+	return nil
+}
+
+//RuleEngineRepository specifies realm persistence API
+type RuleEngineRepository interface {
+	//Save save the RuleEngine
+	Save(context.Context, RuleEngine) error
+
+	//Update the RuleEngine
+	Update(context.Context, RuleEngine) (RuleEngine, error)
+
+	//Retrieve return RuleEngine by RuleEngine id
+	Retrieve(context.Context, string) (RuleEngine, error)
+
+	//Revoke remove RuleEngine by RuleEngine id
+	Revoke(context.Context, string) error
+
+	//List return all RuleEngines
+	List(context.Context, uint64, uint64) (RuleEnginePage, error)
+}
+
+// RuleEngineCache contains thing caching interface.
+type RuleEngineCache interface {
+	// Save stores pair thing key, thing id.
+	Save(context.Context, string, string) error
+
+	// ID returns thing ID for given key.
+	ID(context.Context, string) (string, error)
+
+	// Remove thing from cache.
+	Remove(context.Context, string) error
+}
diff --git a/pkg/rule_engine/rule_service.go b/pkg/rule_engine/rule_service.go
new file mode 100644
index 0000000..203458f
--- /dev/null
+++ b/pkg/rule_engine/rule_service.go
@@ -0,0 +1,139 @@
+package rule_engine
+
+import (
+	"context"
+	"github.com/pkg/errors"
+)
+
+const (
+	RULE_STATUS_CREATED = "created"
+	RULE_STATUS_STARTED = "started"
+	RULE_STATUS_STOPPED = "stopped"
+	RULE_STATUS_UNKNOWN = "unknown"
+)
+
+var (
+	// ErrConflict indicates usage of the existing email during account
+	// registration.
+	ErrConflict = errors.New("email already taken")
+
+	// ErrMalformedEntity indicates malformed entity specification
+	// (e.g. invalid realmname or password).
+	ErrMalformedEntity = errors.New("malformed entity specification")
+
+	// ErrUnauthorizedAccess indicates missing or invalid credentials provided
+	// when accessing a protected resource.
+	ErrUnauthorizedAccess = errors.New("missing or invalid credentials provided")
+
+	// ErrNotFound indicates a non-existent entity request.
+	ErrNotFound = errors.New("non-existent entity")
+
+	// ErrruleEngineNotFound indicates a non-existent realm request.
+	ErrruleEngineNotFound = errors.New("non-existent ruleEngine")
+
+	// ErrScanMetadata indicates problem with metadata in db.
+	ErrScanMetadata = errors.New("Failed to scan metadata")
+
+	// ErrMissingEmail indicates missing email for password reset request.
+	ErrMissingEmail = errors.New("missing email for password reset")
+
+	// ErrUnauthorizedPrincipal indicate the pricipal can not be recognized
+	ErrUnauthorizedPrincipal = errors.New("unauthorized principal")
+)
+
+//Service service
+type Service interface {
+	AddNewruleEngine(context.Context, RuleEngine) error
+	GetruleEngineInfo(context.Context, string) (RuleEngine, error)
+	UpdateruleEngine(context.Context, RuleEngine) (RuleEngine, error)
+	RevokeruleEngine(context.Context, string) error
+	ListruleEngine(context.Context, uint64, uint64) (RuleEnginePage, error)
+	UpdateruleEngineStatus(context.Context, string, string) error
+}
+
+/*
+var _ Service = (*ruleEngineService)(nil)
+
+type ruleEngineService struct {
+	ruleEngines      RuleEngineRepository
+	mutex            sync.RWMutex
+	instanceManager  instanceManager
+	ruleEnginesCache RuleEngineCache
+}
+
+//New new
+func New(ruleEngines RuleEngineRepository, instancemanager instanceManager, ruleEngineCache RuleEngineCache) Service {
+	return &ruleEngineService{
+		ruleEngines:      ruleEngines,
+		instanceManager:  instancemanager,
+		ruleEnginesCache: ruleEngineCache,
+	}
+}
+
+func (svc ruleEngineService) AddNewruleEngine(ctx context.Context, ruleEngine RuleEngine) error {
+	return svc.ruleEngines.Save(ctx, ruleEngine)
+}
+
+func (svc ruleEngineService) GetruleEngineInfo(ctx context.Context, ruleEngineID string) (RuleEngine, error) {
+	ruleEngine, err := svc.ruleEngines.Retrieve(ctx, ruleEngineID)
+	if err != nil {
+		return RuleEngine{}, errors.Wrap(ErrruleEngineNotFound, err.Error())
+	}
+
+	return ruleEngine, nil
+}
+
+func (svc ruleEngineService) UpdateruleEngine(ctx context.Context, ruleEngine RuleEngine) (RuleEngine, error) {
+
+	old_ruleEngine, err := svc.ruleEngines.Retrieve(ctx, ruleEngine.ID)
+	if err != nil {
+		return RuleEngine{}, errors.Wrap(ErrruleEngineNotFound, err.Error())
+	}
+	if old_ruleEngine.Status == RULE_STATUS_STARTED {
+		return RuleEngine{}, status.Error(codes.FailedPrecondition, "")
+	}
+
+	return svc.ruleEngines.Update(ctx, ruleEngine)
+}
+
+func (svc ruleEngineService) RevokeruleEngine(ctx context.Context, ruleEngineID string) error {
+
+	ruleEngine, err := svc.ruleEngines.Retrieve(ctx, ruleEngineID)
+	if err != nil {
+		return errors.Wrap(ErrruleEngineNotFound, err.Error())
+	}
+	if ruleEngine.Status == RULE_STATUS_STARTED {
+		return status.Error(codes.FailedPrecondition, "")
+	}
+
+	return svc.ruleEngines.Revoke(ctx, ruleEngineID)
+}
+
+func (svc ruleEngineService) ListruleEngine(ctx context.Context, offset uint64, limit uint64) (RuleEnginePage, error) {
+	return svc.ruleEngines.List(ctx, offset, limit)
+}
+
+func (svc ruleEngineService) UpdateruleEngineStatus(ctx context.Context, ruleEngineID string, updatestatus string) error {
+
+	ruleEngine, err := svc.ruleEngines.Retrieve(ctx, ruleEngineID)
+	if err != nil {
+		return errors.Wrap(ErrruleEngineNotFound, err.Error())
+	}
+
+	switch updatestatus {
+	case UPDATE_RULE_STATUS_START:
+		if ruleEngine.Status != RULE_STATUS_CREATED && ruleEngine.Status != RULE_STATUS_STOPPED {
+			return status.Error(codes.FailedPrecondition, "")
+		}
+
+		return svc.instanceManager.startRuleEngine(&ruleEngine)
+	case UPDATE_RULE_STATUS_STOP:
+		if ruleEngine.Status != RULE_STATUS_STARTED {
+			return status.Error(codes.FailedPrecondition, "")
+		}
+
+		return svc.instanceManager.stopRuleEngine(&ruleEngine)
+	}
+	return nil
+}
+*/