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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.


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