fix(eventbus): align async core config and lifecycle guards

Author: WyRainBow

pkg/config/app/admin.go

@@ -120,7 +120,7 @@ func (c AdminConfig) PostProcess() error {
 	)
 }
 
-func (c AdminConfig) Validate() error {
+func (c *AdminConfig) Validate() error {
 	if c.Log == nil {
 		c.Log = log.DefaultLogConfig()
 	} else if err := c.Log.Validate(); err != nil {

pkg/config/eventbus/config.go

@@ -29,6 +29,6 @@ func (c Config) Validate() error {
 
 func Default() Config {
 	return Config{
-		BufferSize: 100,
+		BufferSize: 1024,
 	}
 }

pkg/core/events/async.go

@@ -19,8 +19,6 @@ package events
 
 import "sync/atomic"
 
-// AsyncSubscriber is an optional interface.
-// Subscribers implementing this interface can be dispatched asynchronously.
 type AsyncSubscriber interface {
 	Subscriber
 	AsyncEnabled() bool

pkg/core/events/component.go

@@ -39,6 +39,7 @@ type EventBusComponent interface {
 }
 
 var _ EventBusComponent = &eventBus{}
+var _ runtime.GracefulComponent = &eventBus{}
 
 type eventBus struct {
 	rwMutex       sync.RWMutex