refactor

doc/server/sq_01_srvmessaging.puml

@@ -0,0 +1,20 @@
+@startuml "Simple messaging"
+actor       Sender as snd
+actor       Receiver   as rcv
+control     Server     as srv
+collections msg as msg
+queue       msgch       as msgch
+collections dvyrq as dvyrq
+collections dvy as dvy
+queue       dvych as dvych
+
+rcv->srv: Listen
+srv->msgch: Subscribe
+snd->srv: Send message
+srv->msg: Store message
+srv->msgch: Notify listening receivers
+msgch->srv: Notify
+msg->srv: Grab message
+srv->rcv: Send message
+
+@enduml