Asynchronous command validation on EventSourceBehavior

@brabo-hi wrote:

On akka persistence, when receiving a command, how can we execute asynchronous function to validate the command before deciding to reject the command of to persist an event?

EventSourcedBehavior accepts:

commandHandler: (State, Command) => ReplyEffect[Event, State]

I would like to do something like:

val validateCommand(command: Command): Future[Boolean]

commandHandler: (State, Command) => 
validateCommand(command).map(boolean => 
   if(boolean)
     Effect.reply(replyTo)(Rejected("reason"))
   else
     Effect.persist(MyEvent()).thenReply(reply)(_ => Accepted)
)

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