Skip to main content

AOP using RealProxy (custom implementation) - Part II - Register to a IoC container

In the last post of this series we saw how we can use RealProxy to implement our custom AOP stack in .NET that can measure how long a method lasts. In this post we will see what is the mechanism that can be used to register our instance to a IoC container with or without a duration profiler (with or without a proxy).
The solution is pretty simple and can be used with any kind of IoC stack. Basically, when we register our instance to the container we will detect if we need or not to measure how long the methods takes place from our specific class. Based on this information we can register to the container an instance of DurationProfilingDynamicProxy (our custom RealProxy) or not.
In the next example, using a flag read from configuration file we create a specific instance of our Foo objects.
private static IFoo CreateFooInstance(bool isFooProfillingActive)
            IFoo fooOriginalInstance = new Foo();
            IFoo fooContainerInstance = null;
            if (isFooProfillingActive)
                fooContainerInstance = (IFoo) new DurationProfilingDynamicProxy<IFoo>(fooOriginalInstance).GetTransparentProxy();
                fooContainerInstance = fooOriginalInstance;
            return fooContainerInstance;
Dont' forget to call “GetTransparentProxy” to get an instance of the object when we are using a proxy.
new DurationProfilingDynamicProxy<IFoo>(fooOriginalInstance).GetTransparentProxy()
Using the instance returned by the previous method, we will register our instance to the container.
IFoo fooContainerInstance = CreateFooInstance(isFooProfillingActive);
container.RegisterInstance(typeof(IFoo), fooContainerInstance);
The methods that create the instance of our IFoo object could be written also in the following way:
private static IFoo CreateFooInstance(bool isFooProfillingActive)
    IFoo fooInstance = new Foo();
    if (isFooProfillingActive)
        fooInstance = (IFoo) new DurationProfilingDynamicProxy<IFoo>(fooInstance).GetTransparentProxy();
    return fooInstance;
In this post we saw how we can register to IoC container a real implementation or a proxy that measure how long the method takes place using RealProxy. In the next post on this subject we will implement a proxy that writes in the log when a method was called, the input parameters and the result of the call.


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…