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PONServiceBus Host that Subscribes to his own Published Messages
 

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  1. PONServiceBus Host that Subscribes to his own Published Messages
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    <p>Used Version of NServiceBus: 2.0.0.1145</p> <h2>Question:</h2> <p>Is it possible to configure a NServiceBus Host in such a way that, it consumes (subcribes to) his own published messages?</p> <h2>Answer:</h2> <p>It seems possible, but in the following Configuration it gives me a Transaction deadlocked Exception while trying to insert Subscriptions into the SubscriptionStorage. It happens when you use DbSubscriptionStorage and more than 1 "NumberOfWorkerThreads".</p> <h2>Error:</h2> <p><code>Could not execute command:<br> INSERT INTO Subscription (SubscriberEndpoint, MessageType) VALUES (@p0, @p1)<br> System.Data.SqlClinet.SqlException:<br> Transaction was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.</code></p> <p>After that NServiceBus tries to disconnect but fails because there is a transaction still in progress and throws an UnhandledException.</p> <h1>How to reproduce:</h1> <h3>Here is my App.Config:</h3> <pre><code>&lt;!-- Publishing Configuration --&gt; &lt;MsmqTransportConfig InputQueue="test_publisher_output" ErrorQueue="test_error" NumberOfWorkerThreads="3" MaxRetries="5" /&gt; &lt;!-- Subscription Configuration --&gt; &lt;UnicastBusConfig DistributorControlAddress="" DistributorDataAddress="" ForwardReceivedMessagesTo=""&gt; &lt;MessageEndpointMappings&gt; &lt;add Messages="MessageAssembly" Endpoint="test_publisher_output" /&gt; &lt;/MessageEndpointMappings&gt; &lt;/UnicastBusConfig&gt; </code></pre> <h3>My Bus-Configuration:</h3> <pre><code>var bus = Configure.With() .Log4Net() .StructureMapBuilder(container) .XmlSerializer() .MsmqTransport() .IsTransactional(true) .PurgeOnStartup(false) .DBSubcriptionStorage(subscriptionDbProperties, true) .Sagas() .NHibernateSagaPersister(sagaDbProperties, true) .UnicastBus() .ImpersonateSender(false) .LoadMessageHandlers(First&lt;GridInterceptingMessageHandler&gt; .Then&lt;SagaMessageHandler&gt;()) .CreateBus() .Start(); </code></pre> <p>and here are my dbProperties for both the subscription and the saga db:</p> <pre><code>connection.provider NHibernate.Connection.DriverConnectionProvider connection.driver_class NHibernate.Driver.SqlClientDriver dialect NHibernate.Dialect.MsSql2005Dialect </code></pre> <p>Everything works fine as long as i don't increase the NumberOfWorkerThreads above 1. Everything higher than that and it will throw the above stated errors.</p> <p>I hope i haven't forgotten anything. Thanks for your help in advance.</p>
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    1. USStephan Schinkel
    1. USStephan Schinkel
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    1. COWhy would the same endpoint want to subscribe to messages that it is publishing itself? I mean, if you wanted to have additional things happen in the same endpoint, you could just put them in the code that did the publish in the first place.
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      1. PONServiceBus Host that Subscribes to his own Published Messages
      1. USUdi Dahan
    2. COHi Udi, because i would then loose on the stability nservicebus gives me. i want to breakdown a whole bunch of work into small packages that are executed by messagehandlers. examples of work done here are calling webservices, opening ftp connections, creating and converting xml-files, databasetransactions etc.. also i would like to have the option to just publish or send a message and don't want to care about the endpoint. the administrators of the application should decide where to host endpoints. in the simplest configuration this whole bunch of work should be done in one host.
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      1. PONServiceBus Host that Subscribes to his own Published Messages
      1. USStephan Schinkel
 

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