CODEWITHSUNDEEP
f#akkadead-letter
Pankaj Chouthmal
Pankaj Chouthmal

Reputation: 195

how to subscribe and view dead letters in F#

I have tried following code to view/capture dead letters but it is not working in a way it should. What I am missing.exactly? My aim is just to view all the dead letters that are being delivered to deadletters actor.

let system = ActorSystem.Create("FSharp")

let echoServer = 
spawn system "EchoServer"
<| fun mailbox ->
    let rec loop() =
        actor {
            let! message = mailbox.Receive()
            match box message with
            | :? string -> 
                printfn "Echo '%s'" message
                return! loop()
            | _ ->  failwith "unknown message"
        } 
    loop()

let boolval = system.EventStream.Subscribe(echoServer,typedefof<DeadLetterActorRef>)
echoServer.Tell("First Message")
echoServer.Tell("Second Message")
system.DeadLetters.Tell("Dead Message")

Upvotes: 0

Views: 200

Answers (1)

bruinbrown
bruinbrown

Reputation: 1006

When you subscribe to the event bus, you're subscribing to the type of message published to the bus. In the code you posted you registered the subscriber to the DeadLetterActorRef message, whereas dead letters are published in the form of DeadLetter messages. So in your case, you just need to change your subscription to

let boolval = system.EventStream.Subscribe(echoServer, typeof<DeadLetter>)

Upvotes: 3

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