Service Bus topics and subscriptions in Azure - Mini Project: Build & Apply

Service Bus Topics and Subscriptions Setup

📖 Scenario: You are building a messaging system in Azure where multiple services need to receive messages independently. You will use Azure Service Bus topics and subscriptions to distribute messages to different receivers.

🎯 Goal: Create an Azure Service Bus topic and two subscriptions with specific filters to route messages based on their properties.

📋 What You'll Learn

Create a Service Bus topic named orders

Create two subscriptions named highPriority and lowPriority

Add a filter to highPriority subscription to receive messages where priority property equals high

Add a filter to lowPriority subscription to receive messages where priority property equals low

💡 Why This Matters

🌍 Real World

Service Bus topics and subscriptions help distribute messages to multiple independent receivers in cloud applications.

💼 Career

Understanding how to configure topics and subscriptions with filters is essential for cloud engineers working with Azure messaging services.

1

Create the Service Bus topic

Create a variable called topic_name and set it to the string "orders" to represent the Service Bus topic name.

Azure

# Create a variable called topic_name with value "orders"
# Your code here

Need a hint?

Use a simple string assignment to create the topic name variable.

2

Define subscription names

Create two variables called subscription_high and subscription_low with values "highPriority" and "lowPriority" respectively to represent subscription names.

Azure

topic_name = "orders"
# Create variables subscription_high and subscription_low with values "highPriority" and "lowPriority"
# Your code here

Need a hint?

Assign the exact string values to the subscription variables.

3

Create filters for subscriptions

Create two variables called filter_high and filter_low with values "priority = 'high'" and "priority = 'low'" respectively to represent SQL filters for the subscriptions.

Azure

topic_name = "orders"
subscription_high = "highPriority"
subscription_low = "lowPriority"
# Create variables filter_high and filter_low with SQL filter strings
# Your code here

Need a hint?

Use SQL-like syntax strings to define the filters exactly as shown.

4

Define the subscription creation commands

Create two variables called create_subscription_high and create_subscription_low that hold the Azure CLI commands as strings to create the subscriptions highPriority and lowPriority on the topic orders with their respective filters filter_high and filter_low. Use the format: az servicebus topic subscription create --resource-group MyResourceGroup --namespace-name MyNamespace --topic-name orders --name subscription_name --rule-name priorityFilter --filter-filter_expression where filter_expression is the filter string.

Azure

topic_name = "orders"
subscription_high = "highPriority"
subscription_low = "lowPriority"
filter_high = "priority = 'high'"
filter_low = "priority = 'low'"
# Create variables create_subscription_high and create_subscription_low with Azure CLI commands
# Your code here

Need a hint?

Use escaped quotes for the filter expressions inside the command strings exactly as shown.