Subscription $subscription -Name '$Default' Remove-AzServiceBusRule -ResourceGroupName $resourceGroup -Namespace $namespace -Topic $topic ` Subscription $subscription -Name "OnToPropertyFilter" -SqlExpression $sqlExpression New-AzServiceBusSubscription -ResourceGroupName $resourceGroup -Namespace $namespace -Topic $topic ` To test the rule, is it easiest to make more than one subscription. You can create as many subscriptions as you want. We also delete the $Default rule because that one is no longer of use. $sqlExpression = "sys.To IS NULL OR sys.To = '$subscription'"Ī subscription with a new rule can be made with the following snippet of code. We create such a rule with the following two lines of code. This filters all messages that are not intended for us. Now we create a rule that accepts messages if the To property is empty or set the name of our subscription. We can set this property to the name of our subscription when we resubmit the DLQ message. The To property is used to set the recipient of the message. New-AzServiceBusTopic -ResourceGroupName $resourceGroup -Namespace $namespace -Name $topic `Ī message has a number of properties that can be used by applications for things like routing or special processing. New-AzServiceBusNamespace -ResourceGroupName $resourceGroup -NamespaceName $namespace ` You can find here more information about the module. I use the Az PowerShell module to create all the resources in Azure. Creating a solutionįor this example we create a new servicebus and a topic. As a result the subscription receives all messages on the topic. You always receive a default rule with the name $Default when creating a new subscription. If the expression evaluates to true, the message will be let through the filter. These rules exist of sql-like expressions that result in a boolean. The idea is that each subscription has its own rule that filters the incoming messages. These filters are defined as rules on subscription queues. This problem can be solved with the use of Topic Filters. However, this will lead to unintentionally duplicate message handling because all subscriptions of that topic will receive that message again. This means that you cannot place a DLQ message directly onto your own subscription.Ī simple solution seems to create a clone of the DLQ message and place this back onto the Topic. Azure Service Bus by design doesn’t support message resubmission. Each subscription has a secondary sub-queue, called a dead-letter queue (DLQ) to hold messages that cannot be delivered to the receiver.Ī problem arises when you try to resubmit a DLQ message. A topic can have multiple queues that are called subscriptions. Topics provide a one-to-many form of communication. In this blog post I’m going to show an example of how you can implement a simple retry pattern for the Azure Service Bus when you are working with topics and subscriptions.
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