Skip to main content

Service Bus Topics - Define custom rules for messages that don’t respect any rule defined in a topic

In one of my older post I tacked about how we can define filters for each subscriber of a Service Bus Topics. We saw how we can filter messages for a subscriber based on some rules that are defined using FilterExpression:
RuleDescription ruleDescription = new RuleDescription()

{

    Action = new SqlRuleAction("set isValid= false"),

    Filter = new SqlFilter("value = 10");

}

namespaceManager.CreateSubscription(

    "myFooTopic",

    "seccondSubscription",

    ruleDescription);

var subscription = namespaceManager.CreateSubscription(

    "myFooTopic",

    " thirdSubscription");

subscription.Add(ruleDescription);

Using these rules is quite simple to define custom rules for the messages from a topic. But what about messages that don’t respect any rules defined in our topic? How we can detect these messages and define a custom rule for them. In a perfect word we can control the messages that arrive in our topic, but in a distributed system these thing doesn’t happen all the time.
For this cased we can use “MatchNoneFilterExpression” that will route to our topic all the messages that were not consumed by our subscribers. For example in our example we only consume messages that have the value equal with 10. What about the rest of the messages? Of course we can define a rule for values that are not equal with 10, but if we have more subscribes with different rules it will complicated to define the non-true rules for all the subscribers.
 RuleDescription notConsumedMessagesRule = new RuleDescription()

 {

     FilterAction = new SqlFilterAction(“set isNotConsumed = true;”),

     FilterExpression = new MatchNoneFilterExpression()

 };

 subscription.Add(notConsumedMessagesRule);
In the above example our rule adds a property named “isNotConsumed” and set the value to true. Based on this rule we will able to route this messages to a specific subscriber.
In the same way we have another filter expression that is used when we want to define a rule for the messages that match all the filter expression from all our rules – MatchAllFilterExpression.
RuleDescription matchAllRule = new RuleDescription()
 {
     FilterAction = new SqlFilterAction(“set matchAll = true;”),
     FilterExpression = new MatchAllFilterExpression()
 };
 subscription.Add(matchAllRule);

Using this filter expression we can define custom rules for messages that didn’t respect any defined rule or messages that respect all the rules from our topic. In the end I want to enumerate the filter expression that can be used in this moment:
  • CorrelationFilterExpression
  • MatchNoneFilterExpression
  • MatchAllFilterExpression
  • SqlFilterExpression

Comments

Popular posts from this blog

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&#…

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 …

Run native .NET application in Docker (.NET Framework 4.6.2)

Scope
The main scope of this post is to see how we can run a legacy application written in .NET Framework in Docker.

Context
First of all, let’s define what is a legacy application in our context. By a legacy application we understand an application that runs .NET Framework 3.5 or higher in a production environment where we don’t have any more the people or documentation that would help us to understand what is happening behind the scene.
In this scenarios, you might want to migrate the current solution from a standard environment to Docker. There are many advantages for such a migration, like:

Continuous DeploymentTestingIsolationSecurity at container levelVersioning ControlEnvironment Standardization
Until now, we didn’t had the possibility to run a .NET application in Docker. With .NET Core, there was support for .NET Core in Docker, but migration from a full .NET framework to .NET Core can be costly and even impossible. Not only because of lack of features, but also because once you…