Imp: add remark for OnMessage to let user handle the OnMessage asynchronously

getty.go

@@ -56,9 +56,15 @@ type EventListener interface {
 	// invoked periodically, its period can be set by (Session)SetCronPeriod
 	OnCron(Session)
 
-	// invoked when receive packge. Pls attention that do not handle long time logic processing in this func.
-	// You'd better set the package's maximum length. If the message's length is greater than it, u should
-	// should return err in Reader{Read} and getty will close this connection soon.
+	// invoked when getty received a package. Pls attention that do not handle long time
+	// logic processing in this func. You'd better set the package's maximum length.
+	// If the message's length is greater than it, u should should return err in
+	// Reader{Read} and getty will close this connection soon.
+	//
+	// If ur logic processing in this func will take a long time, u should start a goroutine
+	// pool(like working thread pool in cpp) to handle the processing asynchronously. Or u
+	// can do the logic processing in other asynchronous way.
+	// !!!In short, ur OnMessage callback func should return asap.
 	//
 	// If this is a udp event listener, the second parameter type is UDPContext.
 	OnMessage(Session, interface{})

session.go

@@ -489,7 +489,8 @@ LOOP:
 			if flag {
 				log.Debug("%#v <-s.rQ", inPkg)
 				pkg := inPkg
-				go s.listener.OnMessage(s, pkg)
+				// go s.listener.OnMessage(s, pkg)
+				s.listener.OnMessage(s, pkg)
 				s.incReadPkgNum()
 			} else {
 				log.Info("[session.handleLoop] drop readin package{%#v}", inPkg)