Skip to main content

Windows Azure Service Bus - Control what actions can be made

Did you ever need or want to disable the send functionality from a queue or from a topic? All the people start to send messages to you even if you say STOP. How nice would be to be able to say STOP.
We have good news for people that use Windows Azure Service Bus (Queue, Topics and Subscriptions). With the new version of SDK (2.0), we can control the operation that can be made on Service Bus. How nice is that.
People would ask – why we would want to do something like this. Well, there are times, especially when we make tests, when we want to control this. I see this value in two situations:
When we want to make performance tests, to see how many messages we can consume from a queue in a specific time interval
When there a lot of messages in the queue or topic and we don’t want to accept new messages anymore.
This feature can be controlled from the description of the queue, topic or subscription.  Based on what kind of service we use from Service Bus we can have different status. It is important to not forger to call the UpdateQueue or UpdateTopic/UpdateSubscription after you change the service status.
The entity status of a services can have the following values:
  • EntityStatus.Disable – Sending and receiving messages is disabled
  • EntityStatus.SendDisabled – Sending is disable
  • EntityStatus.ReceiveDisabled – Receiving is disabled
  • EntityStatus.Active – Sending and receiving are active
Don’t try to use a combination of this status. All the possible combinations are supported with this 4 status.
TopicDescription topic = namespaceManager.GetTopic("fooTopic");
topic.Status = EntityStatus.SendDisabled; //can continue to de-queue
namespaceManager.UpdateQueue(topic);
This configuration can be made from the moment when you create the topic.
if (!namespaceManager.TopicExists("fooTopic"))
{
    TopicDescription topic = new TopicDescription("fooTopic");
    topic.Status = EntityStatus.SendDisabled; //can continue to de-queue
    namespaceManager.CreateTopic(topic);
}

Comments

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 http://go.microsoft.com/fwlink/?LinkId=260882 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.

Coding

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

Programming

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

Design

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