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Comments (3)

bobanco avatar bobanco commented on June 3, 2024

you need to use RestartSink ,if you want your sink to restart when the connection drops, so the sink will be recreated with new connection to rabbit. Also u can combine them with KillSwitch so you can also gracefully stop.

something like this:

var source = Source.Queue<string>(0, OverflowStrategy.Backpressure);
var restartSink = RestartSink.WithBackoff(() =>
                {
                    Console.WriteLine("Restarting AMQP Sink.");
                    var amqpSink = AmqpSink.CreateSimple(
                        AmqpSinkSettings.Create(connectionSettings)
                            .WithRoutingKey(queueName)
                            .WithDeclarations(queueDeclaration,bindingDeclaration,exchangeDeclaration));
                    return amqpSink;
                }, TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(5), 0.2);

var tupple = source
                    .Select(ByteString.FromString)
                    .ViaMaterialized(KillSwitches.Single<ByteString>(),Keep.Both)
                    .ToMaterialized(restartSink,Keep.Left)
                    .Run(mat);

                var sinkKillSwitch = tupple.Item2;
                var queueSource = tupple.Item1;

                sinkKillSwitch.Shutdown();

from alpakka.

vasily-kirichenko avatar vasily-kirichenko commented on June 3, 2024

@bobanco Excellent, thanks! :) I completely forgot about RestartSink however read about it a week ago.

It works, but it uncover a bug in PostStop:

[ERROR][17-Jan-18 19:46:30][Thread 0003][[akka://test/user/StreamSupervisor-0/Flow-0-0-unknown-operation#1059276845]] Error during PostStop in [AmqpSink]
Cause: System.NullReferenceException: Object reference not set to an instance of an object.
   at Akka.Streams.Amqp.AmqpSinkStage.AmqpSinkStageLogic.PostStop()
   at Akka.Streams.Implementation.Fusing.GraphInterpreter.FinalizeStage(GraphStageLogic logic)

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vasily-kirichenko avatar vasily-kirichenko commented on June 3, 2024

The NRE is fixed in #23

from alpakka.

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