使用 Java/Spring 连接到 Azure 事件网格和服务总线

Question

I have a scenario where Azure ServiceBus sends events to Event Grid whenever there is a message in Azure Service bus's queue/topic. So how do I establish the connection in Java/Spring with Event Grid to receive events and also with Service Bus to pull the messages. What are the configurations are to be done in Java/Spring to establish connections with Event Grid and Azure Service bus? Also what are the configuration that has to be done on the application side(application.yml or properties file) to include things like connection string and etc.?

Answer 1

Your requirement can be easily achieved by azure function app.

Set the service bus queue/topic as the trigger of your function to receive messages .

And use Azure SDK for Java to send events to event grid:

https://docs.microsoft.com/en-us/java/api/overview/azure/eventgrid/client?view=azure-java-stable

https://docs.microsoft.com/en-us/java/api/overview/azure/messaging-eventgrid-readme?view=azure-java-stable

Answer 2

Azure Service Bus to Event Grid integration

Service Bus can now emit events to Event Grid when there are messages in a queue or a subscription when no receivers are present. You can create Event Grid subscriptions to your Service Bus namespaces, listen to these events, and then react to the events by starting a receiver.

To enable the feature, you need the following items:

• A Service Bus Premium namespace with at least one Service Bus queue or a Service Bus topic with at least one subscription.
• Contributor access to the Service Bus namespace. Navigate to your Service Bus namespace in the Azure portal, and then select Access control (IAM), and select Role assignments tab. Verify that you have the contributor access to the namespace.
• Additionally, you need an Event Grid subscription for the Service Bus namespace. This subscription receives a notification from Event Grid that there are messages to be picked up. Typical subscribers could be the Logic Apps feature of Azure App Service, Azure Functions, or a webhook contacting a web app. The subscriber then processes the messages.

Check this Microsoft document for more info.

Check this one to use Azure Function to connect both.

Check this doc to use Logic App to connect both.

Azure CLI:

namespaceid=$(az resource show --namespace Microsoft.ServiceBus --resource-type namespaces --name "<service bus namespace>" --resource-group "<resource group that contains the service bus namespace>" --query id --output tsv

az eventgrid event-subscription create --resource-id $namespaceid --name "<YOUR EVENT GRID SUBSCRIPTION NAME>" --endpoint "<your_endpoint_url>" --subject-ends-with "<YOUR SERVICE BUS SUBSCRIPTION NAME>"

Powershell:

$namespaceID = (Get-AzServiceBusNamespace -ResourceGroupName "<YOUR RESOURCE GROUP NAME>" -NamespaceName "<YOUR NAMESPACE NAME>").Id

New-AzEVentGridSubscription -EventSubscriptionName "<YOUR EVENT GRID SUBSCRIPTION NAME>" -ResourceId $namespaceID -Endpoint "<YOUR ENDPOINT URL>” -SubjectEndsWith "<YOUR SERVICE BUS SUBSCRIPTION NAME>"