Question

I have the following Setup:

• One service called CoreHost should receive a ExecuteWorkflowByAttributeCommand which is Bus.Send to it and publish WorkflowByAttributeExecuted afterwards.

• One “client” which uses Bus.Send to execute the command and is subscribed to the WorkflowByAttributeExecuted message.

The Handler looks like this:

    public void Handle(WorkflowByAttributeCommand message)
    {
        MessageLifetimeLogger.Info("Received WorkflowByAttribute Command", ...);

        var log = _executor.ExecuteWithLog(message.Attribute, 
                                           message.SerializedWorkItem,
                                           message.Id);
        Bus.Publish(new WorkflowByAttributeExecuted(message.Id, log));

        MessageLifetimeLogger.Info("Completed WorkflowByAttribute Command", ...);
    }

On my development machine it runs fine but on our test system the same does not.

The command is received and the handler is obviously executed (the log contains the appropriate entries) but no message is published.

What surprises me is that the log looks completely different on both machines.

The working machines log contains

Received message MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeCommand, MHP.Domain.Common.Core, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null with ID 6e15d4f7-7aa7-4be3-bd80-e70497bc5051\66585 from sender TestServerQueue@PC-SB-11
Activating: WorkflowByAttributeHandler 
// some log entries generated by the Handle method
Sending message MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeExecuted, MHP.Domain.Common.Core, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null with ID 6e15d4f7-7aa7-4be3-bd80-e70497bc5051\66587 to destination TestServerQueue@PC-SB-11.
WorkflowByAttributeHandler Done. 

whereby the not working machines log contains only

Received message MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeCommand, MHP.Domain.Common.Core, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null with ID 6e15d4f7-7aa7-4be3-bd80-e70497bc5051\66585 from sender TestServerQueue@PC-SB-11
// some log entries generated by the Handle method

However all message types seem to be registered successfully:

Subscribing TestServerQueue@VM-SCRUM-VLOG to message type MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeExecuted, MHP.Domain.Common.Core, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null |  
Subscribing TestServerQueue@VM-SCRUM-VLOG to message type MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeCommand, MHP.Domain.Common.Core, Version=0.0.0.1, Culture=neutral, PublicKeyToken=null |  

The app.config of the server looks like

<MsmqTransportConfig
    InputQueue="CoreHostQueue"
    ErrorQueue="ErrorQueue"
    NumberOfWorkerThreads="1"
    MaxRetries="5" />

<UnicastBusConfig>
    <MessageEndpointMappings>
    </MessageEndpointMappings>
</UnicastBusConfig>

The other one contains the message mappings

<MsmqTransportConfig
  InputQueue="TestServerQueue"
  ErrorQueue="ErrorQueue"
  NumberOfWorkerThreads="2"
  MaxRetries="5" />

<UnicastBusConfig>
  <MessageEndpointMappings>
    <add Messages="MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeCommand, MHP.Domain.Common.Core" Endpoint="CoreHostQueue"/>
    <add Messages="MHP.Domain.Common.Core.Messaging.WorkflowByAttribute.WorkflowByAttributeExecuted, MHP.Domain.Common.Core" Endpoint="CoreHostQueue"/>
  </MessageEndpointMappings>
</UnicastBusConfig>

Answer 1

The subscriptions where not stored durably. Thanks to Andreas Öhlund for help!