Skip to main content

How to iterage a Service Bus Queue using Azure SDK 2.0 & What are the concerns of this new feature

The new version of Windows Azure Service Bus came with a lot of new feature. One of the new feature that was added in Windows Azure SDK 2.0 is the support of message browsing.
What is message browsing? This is a functionality that gives the ability to a client to iterate and access messages from a Service Bus Queue without locking or removing a message from the actual queue.
There are pretty interesting thing that we can do using this feature. For example we can peek a message from a specific index in the queue:
BrokenMessage message = queueClient.Peek(3);
Or we can peek the first message that is available:
BrokenMessage message = queueClient.Peek();
Another option is to peek a specific number of message from the queue:
IEnumerable<BrokenMessage> messages = queueClient.PeekBatch(20);
The PeekBatch support also two parameters, where the first one is used to specify the starting index (similar with Peek(3)):
IEnumerable<BrokenMessage> messages = queueClient.PeekBatch(100, 20)
In the above example we peek the next 20 messages, starting from the index 100.
Interesting feature, from now one we can iterate a queue. Great! But I have an open question:
Why would we want to iterate a queue?
If we need a functionality like this, then maybe we don’t use the proper service. For example, we would say that we need this feature when we need to do monitoring or audit of a system. Well… true – we could use this feature to have audit system over a queue, BUT. Yes, there is a big BUT. Why would you use a queue when you need to support audit over it. You can use Service Bus Topic and have a dedicated subscription for the audit system. For the same price, you can have a system that was created for this scenario.
Other cases when people would find this feature useful would be in the moment when they need to debug the application. They could see the content of the queue – the investigation process would be easier. True, I had the “opportunity” to   debug a system that use queues and when you cannot control the content of the queue, then the nightmare begin. When problem like this occurs I would try to use the death letter feature – when a message cannot be processed X times, than the message is send automatically to death letter queue.
I see the value of this feature when we need to make debug or to investigate the content of a queue. In the same time this feature can open Pandora’s door. Why? Because developer will use this feature in strange way and from a queue we will end up with a list.


  1. Thanks for great posts on service bus. Can you please advise me how to use Topic and subscription in the below scenario?

    There are multiple senders and multiple receivers. one message sent by sender needs to be received by all the receivers. After the last receiver reads the message , the message should be deleted. The receivers may be switched off at different times for maintenance.

    How can we identify that a particular message has been received by other modules so that it can be deleted?

    Thanks in advance

  2. Thanks for the post. I am currently trying to use PeekBatch. It works...sort-of. The first time it returns my only message in the queue, but it won't work again for five minutes. My guess is that PeekBatch is actually locking the messages, which seems like a bug if that is true. Have you successfully got PeekBatch to work back-to-back before? I just posted this on StackOverflow, so hopefully I'm just missing something here.

    1. PeekBatch extract the messages from the queue. The message will not be available anymore in the queue - the message is deleted.
      If you don't have messages anymore in the queue, than the PeekBatch will freeze until new messages are available or the timeout time will expire.
      If you need to get messages from the queue without deleting them than you need to use another method that will make receive and lock ReceiveBatch -


Post a Comment

Popular posts from this blog

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

Today blog post will be started with the following error when running DB tests on the CI machine:
threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration:

TeamCity.NET 4.51EF 6.0.2VS2013
It seems that there …

How to check in AngularJS if a service was register or not

There are cases when you need to check in a service or a controller was register in AngularJS.
For example a valid use case is when you have the same implementation running on multiple application. In this case, you may want to intercept the HTTP provider and add a custom step there. This step don’t needs to run on all the application, only in the one where the service exist and register.
A solution for this case would be to have a flag in the configuration that specify this. In the core you would have an IF that would check the value of this flag.
Another solution is to check if a specific service was register in AngularJS or not. If the service was register that you would execute your own logic.
To check if a service was register or not in AngularJS container you need to call the ‘has’ method of ‘inhector’. It will return TRUE if the service was register.
if ($injector.has('httpInterceptorService')) { $httpProvider.interceptors.push('httpInterceptorService&#…

Fundamental Books of a Software Engineer (version 2018)

More then six years ago I wrote a blog post about fundamental books that any software engineer (developer) should read. Now it is an excellent time to update this list with new entries.

There are 5 different categories of books, that represent the recommended path. For example, you start with Coding books, after that, you read books about Programming, Design and so on.
There are some books about C++ that I recommend not because you shall know C++, only because the concepts that you can learn from it.


Writing solid codeCode completeProgramming Pearls, more programming pearls(recommended)[NEW] Introduction to Algorithms


Refactoring (M. Fowler)Pragmatic ProgrammerClean code[NEW] Software Engineering: A Practitioner's Approach[NEW] The Mythical Man-Month[NEW] The Art of Computer Programming


Applying UML and Patterns (GRASP patterns)C++ coding standards (Sutter, Alexandrescu)The C++ programming language (Stroustrup, Part IV)Object-oriented programming (Peter Coad)P…