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c#dependency-injectionioc-containersimple-injector
advapi
advapi

Reputation: 3907

Simple Injector tracing times

is there a way I can keep track of how much time is taken to resolve an instance via Simple Injector and Constructor's IoC?

I mean something at trace level

Thanks

Upvotes: 1

Views: 210

Answers (1)

Steven
Steven

Reputation: 172606

Resolving instances in Simple Injector is blazingly fast, and should never be a problem, unless your constructors do too much.

Nonetheless, adding tracing can be done using the following extension method (works for Simple Injector v2.x and beyond):

public static void ApplyInterceptor(
    this ContainerOptions options, Func<Func<object>, object> interceptor)
{
    options.Container.ExpressionBuilding += (s, e) =>
    {
        var factory = Expression.Lambda(typeof(Func<object>), e.Expression).Compile();

        e.Expression = Expression.Convert(
            Expression.Invoke(
                Expression.Constant(interceptor),
                Expression.Constant(factory)),
            e.Expression.Type);
    };
}

This ApplyInterceptor extension method can be called to intercept the creation of all types produced by the container, for instance to add this monitoring behavior:

container.Options.ApplyInterceptor(producer =>
{
    var watch = Stopwatch.StartNew();
    object instance = null;
    try
    {
        instance = producer();
        return instance;
    }
    finally
    {
        watch.Stop();
        if (watch.ElapsedMilliseconds > 50)
        {
            string name = instance.GetType().ToFriendlyName();
            Console.WriteLine(
                $"WARNING: {name} took {watch.ElapsedMilliseconds} ms. to resolve.");
        }
    }
})

WARNING: This interceptor gets applied to all registrations in Simple Injector and could severely impact runtime performance, so make sure you only add this during debug builds or when the debugger is attached, to make sure you don't impact runtime performance.

Upvotes: 5

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