Azure Service Bus Topics Multiple subscribers

Azure Service Bus Topics Multiple subscribers

Azure Service Bus Topics are designed to support multiple subscribers. A topic can have multiple subscriptions, each of which represents a logical message stream. Subscribers can register to receive messages from a specific subscription. Each message sent to the topic is delivered to all subscriptions registered to receive it.

To create a subscription to a topic, you need to create an instance of the SubscriptionClient class. This client will be used to receive messages from the subscription. Here's an example of how to create a subscription client:

string connectionString = "your_connection_string_here"; string topicName = "your_topic_name_here"; string subscriptionName = "your_subscription_name_here"; var subscriptionClient = new SubscriptionClient(connectionString, topicName, subscriptionName);

Once you have created a subscription client, you can register a message handler to receive messages from the subscription. Here's an example of how to register a message handler:

subscriptionClient.RegisterMessageHandler( async (message, cancellationToken) => { // Process message here }, new MessageHandlerOptions(ExceptionReceivedHandler) { MaxConcurrentCalls = 1, AutoComplete = false });

In this example, the message handler is an asynchronous lambda expression that takes a Message object and a CancellationToken as input. The message handler is responsible for processing the message.

The MessageHandlerOptions class is used to configure the message handler. In this example, we are setting the MaxConcurrentCalls property to 1, which limits the number of messages that can be processed concurrently. We are also setting the AutoComplete property to false, which means that we are responsible for completing the message after processing is complete.

Note that each subscription can have its own set of message handlers. This means that you can have multiple message handlers processing messages from the same subscription concurrently.

Examples

  1. Azure Service Bus Topics Overview

    • Description: Understanding the basics of Azure Service Bus Topics and the concept of multiple subscribers.
    // Azure Service Bus Topics overview var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); await topicClient.SendAsync(message);

  2. Azure Service Bus Topics Multiple Subscribers

    • Description: Implementing a scenario where multiple subscribers receive messages from a single Azure Service Bus Topic.
    // Azure Service Bus Topics multiple subscribers var subscriptionClient1 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); var subscriptionClient2 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription2"); subscriptionClient1.OnMessage(ProcessMessage); subscriptionClient2.OnMessage(ProcessMessage); void ProcessMessage(BrokeredMessage receivedMessage) { // Process the received message }

  3. Azure Service Bus Topics with Different Filtered Subscriptions

    • Description: Creating subscriptions with different filters to route messages to specific subscribers based on criteria.
    // Azure Service Bus Topics with different filtered subscriptions var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient1 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1", new SqlFilter("Category = 'Technology'")); var subscriptionClient2 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription2", new SqlFilter("Category = 'Science'")); await topicClient.SendAsync(message);

  4. Azure Service Bus Topics with Exclusive Subscriptions

    • Description: Creating exclusive subscriptions to ensure that each message is processed by only one subscriber.
    // Azure Service Bus Topics with exclusive subscriptions var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient1 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); var subscriptionClient2 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription2"); subscriptionClient1.OnMessage(ProcessMessage, new OnMessageOptions { AutoComplete = false }); subscriptionClient2.OnMessage(ProcessMessage, new OnMessageOptions { AutoComplete = false }); void ProcessMessage(BrokeredMessage receivedMessage) { // Process the received message receivedMessage.Complete(); }

  5. Azure Service Bus Topics with Shared Subscriptions

    • Description: Configuring shared subscriptions to allow multiple subscribers to process messages concurrently.
    // Azure Service Bus Topics with shared subscriptions var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient1 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "SharedSubscription"); var subscriptionClient2 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "SharedSubscription"); subscriptionClient1.OnMessage(ProcessMessage); subscriptionClient2.OnMessage(ProcessMessage); void ProcessMessage(BrokeredMessage receivedMessage) { // Process the received message }

  6. Azure Service Bus Topics Message Forwarding

    • Description: Forwarding messages from one subscription to another within the same topic.
    // Azure Service Bus Topics message forwarding var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient1 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); var subscriptionClient2 = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription2"); subscriptionClient1.OnMessage(ProcessAndForwardMessage); void ProcessAndForwardMessage(BrokeredMessage receivedMessage) { // Process the received message subscriptionClient2.Send(receivedMessage.Clone()); receivedMessage.Complete(); }

  7. Azure Service Bus Topics Dead Letter Queue Handling

    • Description: Handling dead-lettered messages in Azure Service Bus Topics.
    // Azure Service Bus Topics dead-letter queue handling var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); subscriptionClient.OnMessage(ProcessAndDeadLetterMessage); void ProcessAndDeadLetterMessage(BrokeredMessage receivedMessage) { try { // Process the received message throw new Exception("Simulated error"); } catch (Exception ex) { // Dead-letter the message receivedMessage.DeadLetter(); } }

  8. Azure Service Bus Topics Retry Policy for Subscribers

    • Description: Configuring a retry policy for handling transient failures in Azure Service Bus Topics subscribers.
    // Azure Service Bus Topics retry policy for subscribers var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); var subscriptionClient = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); var retryPolicy = new RetryExponential(TimeSpan.FromSeconds(1), TimeSpan.FromMinutes(5), 10); subscriptionClient.RetryPolicy = retryPolicy; subscriptionClient.OnMessage(ProcessMessage); void ProcessMessage(BrokeredMessage receivedMessage) { // Process the received message }

  9. Azure Service Bus Topics Sessionful Subscriptions

    • Description: Implementing sessionful subscriptions for ordered message processing in Azure Service Bus Topics.
    // Azure Service Bus Topics sessionful subscriptions var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var message = new BrokeredMessage(Encoding.UTF8.GetBytes("Hello, Topic!")); message.SessionId = "Order123"; var subscriptionClient = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); subscriptionClient.OnMessage(ProcessMessage); void ProcessMessage(BrokeredMessage receivedMessage) { // Process the received message }

  10. Azure Service Bus Topics Batch Processing

    • Description: Implementing batch processing for multiple messages in Azure Service Bus Topics subscribers.
    // Azure Service Bus Topics batch processing var topicClient = TopicClient.CreateFromConnectionString("your_connection_string", "your_topic_name"); var subscriptionClient = SubscriptionClient.CreateFromConnectionString("your_connection_string", "your_topic_name", "Subscription1"); subscriptionClient.OnMessageBatch(ProcessMessages); void ProcessMessages(IEnumerable<BrokeredMessage> receivedMessages) { foreach (var receivedMessage in receivedMessages) { // Process each received message } }

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