AzureServiceBus: new feature to show Dead letter

[adelinor]

Specifications

• JMSToolBox version: 5.14.0
• OS (Name, version, 32/64bits): Windows 10 Enterprise 64 bits
• Q provider (kind, version) : AzureServiceBus

Expected Behavior

AzureServiceBus creates a Dead letter queue behind the scenes. It would be very helpful if this implicitly created queue could be seen from JMSToolBox.

Actual Behavior

JMSToolBox shows all queues that are explicitly created.

Steps to Reproduce the Problem

1. Open a session configured for AzureServiceBus
2. View existing queues under the session's name

Logs

Not applicable

[titou10titou10]

It seems there is not way to retrieve the Dead Letter Queue(s) from the Azure server from the Java/JMS client
JMSToolBox uses the proprietarycom.microsoft.azure.servicebus.management.ManagementClientclass to retrieve the list of Queues and Topics from the server as there is no standard JMS way to do it
This class does not return dead letter queues with thegetQueues()method it seems

https://docs.microsoft.com/en-us/java/api/com.microsoft.azure.servicebus.management.managementclient?view=azure-java-stable

[adelinor]

Dear @titou10titou10 ,

It seems that a dead letter queue gets created for every queue. According to the article, https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dead-letter-queues, the naming convention is <queue name>/$deadletterqueue

Kind regards

[titou10titou10]

OK

• Are those DLQ accessible/visible from a JMS client? Are they considered "first class" destinations from a JMS perspective?
• How to retrieve the list of those DLQ from a JMS client? As said before. the only proprietary API I know to get the list of destination does not do that (iecom.microsoft.azure.servicebus.management.ManagementClient)

JTB could explicitely add those queues based on the naming convention set by Azure for those queues after having retrieved the list of Queues/Topics but this looks like a hack to me

[adelinor]

Yes as per the unit test code added as a comment on issue #137 , when it exists, the dead letter is accessible from the JMS api as any other queue.
The isEnableDeadLetteringOnMessageExpiration() method would tell if the dead letter is configured for a given queue.

How to retrieve the list of those DLQ from a JMS client?
When retrieving the list of queues with com.microsoft.azure.servicebus.management.ManagementClient, then using the QueueDescription you can find out if a corresponding DLQ exists for a given queue.