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Difficulty: MediumImplement Azure Service Bus Solutions

A corporate financial system uses an Azure Service Bus queue named `expense-claims` to process employee reimbursement requests. You are writing the message consumption logic in C# using the `Azure.Messaging.ServiceBus` SDK. To ensure reliability, if the consumer application fails mid-operation, the message must remain in the queue and be re-delivered after the lock duration expires. Once the expense claim is successfully recorded, the message must be deleted.

Which two actions should you take to implement this workflow? (Select two)

  1. Set the receive mode in the ServiceBusReceiverOptions to ServiceBusReceiveMode.PeekLock.Answer
  2. B
    Set the receive mode in the ServiceBusReceiverOptions to ServiceBusReceiveMode.ReceiveAndDelete.
  3. Invoke the CompleteMessageAsync method on the receiver object when processing completes successfully.Answer
  4. D
    Invoke the AbandonMessageAsync method on the receiver object when processing completes successfully.

Answer

To ensure reliable message processing, you must configure the ServiceBusReceiverOptions to use ServiceBusReceiveMode.PeekLock and invoke the CompleteMessageAsync method on the receiver object when processing completes successfully.
To ensure message durability and avoid data loss on application crashes, the receiver must be set to use PeekLock. This mode locks the message for the consumer while keeping it in the queue. Upon successful processing, the application must explicitly call CompleteMessageAsync to delete the message.

Step-by-Step Solution

1
Configure the receiver to lock messages on retrieval.
Initialize ServiceBusReceiverOptions with ServiceBusReceiveMode.PeekLock.
This prevents messages from being deleted immediately, keeping them in the queue if the processing instance crashes.
2
Process the message and write to the database.
The expense claim data is successfully stored.
This is the business logic execution phase.
3
Explicitly delete the message from the queue.
Invoke CompleteMessageAsync on the ServiceBusReceiver.
This signals to Azure Service Bus that processing is complete and the message can be removed.

Key Concept

Reliable message processing using PeekLock and CompleteMessageAsync
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Implement Azure Service Bus Solutions