Kimono 0.0.12

Kimono

<pre> _ _
| | ()
| | ___ _ __ ___ ___ _ __ ___
| |/ / | ' ` _ \ / _ | '_ \ / _ \ | <| | | | | | | () | | | | () | ||__|| || ||_/|| ||_/ </pre>

Kimono is a dynamic proxy framework that allows intercepting methods and properties. Currently in development! Working on generating MSIL for out and ref parameters definitions. See below for examples.

public class Program
{
    public void Main(string[] args)
    {
        var examples = new KimonoExamples();
        examples.NoTargetWithCallbackInterceptorExample();
        examples.TargetWithCallbackInterceptorExample();
        examples.NoTargetWithHandlersInterceptorExample();
        examples.TargetWithHandlersInterceptorExample();
        examples.NoTargetWithInvocationChainInterceptorExample();
        examples.TargetWithInvocationChainInterceptorExample();
    }
}
public class KimonoExamples
{
    public void NoTargetWithCallbackInterceptorExample()
    {
        var interceptor = Interceptor.WithCallback<IRepository>(context =>
        {
            if (context.MemberName == "Baz")
            {
                context.ReturnValue = context.GetParameter<Model>("model");
            }

            if (context.MemberName == nameof(IRepository.Save))
            {
                context.InvokeTarget();
            }
        });

        interceptor.Save(new Model { Id = 20 });
    }
    public void TargetWithCallbackInterceptorExample()
    {
        var interceptor = Interceptor.TargetedWithCallback<IRepository, Repository>(new Repository(), context =>
        {
            context.InvokeTarget();

            if (context.MemberName == nameof(IRepository.Save))
            {
                if (context.ReturnValue is false)
                {
                    //Log failure
                }
            }
        });

        interceptor.Save(new Model { Id = 20 });
    }
    public void NoTargetWithHandlersInterceptorExample()
    {
        var interceptor = Interceptor.WithHandlers<IRepository>(new BazReturnInvocationHandler());

        interceptor.Save(new Model { Id = 20 });
    }
    public void TargetWithHandlersInterceptorExample()
    {
        var interceptor = Interceptor.TargetedWithHandlers<IRepository, Repository>(new Repository(), new BazReturnInvocationHandler());

        interceptor.Save(new Model { Id = 20 });
    }
    public void NoTargetWithInvocationChainInterceptorExample()
    {
        var interceptor = Interceptor.TargetedWithInovcationChain<IRepository, Repository>(new Repository(), builder =>
        {
            builder.Add((next, context) =>
            {
                context.InvokeTarget();

                if (context.MemberName == nameof(IRepository.Save))
                {
                    if (context.ReturnValue is false)
                    {
                        //Log failure
                        return;
                    }
                }

                next(context);
            });
        });

        interceptor.Save(new Model { Id = 20 });
    }
    public void TargetWithInvocationChainInterceptorExample()
    {
        var interceptor = Interceptor.WithInovcationChain<IRepository>(builder =>
        {
            builder.Add((next, context) =>
            {
                if (context.MemberName == nameof(IRepository.Save))
                {
                    context.ReturnValue = true;
                }

                // Call next regardless of condition
                next(context);
            });
        });

        interceptor.Save(new Model { Id = 20 });
    }
    private class BazReturnInvocationHandler : IInvocationHandler
    {
        public void Handle(IInvocationContext context)
        {
            if (context.MemberName == "Baz")
            {
                context.ReturnValue = context.GetParameter<Model>("model");
            }

            if (context.MemberName == nameof(IRepository.Save))
            {
                if (context.ReturnValue is false)
                {
                    //Log failure
                    return;
                }
            }
        }
    }
}
public class Model
{
    public int Id { get; set; }
}
public interface IRepository
{
    bool Save(Model model);
}
public class Repository : IRepository
{
    public bool Save(Model model)
    {
        return true;
    }
}
public interface ILog
{
    void Log(string message);
}
public class Service
{
    private readonly ILog _log;
    private readonly IRepository _repo;
    public Service(ILog log, IRepository repo)
    {
        _log = log;
        _repo = repo;
    }
    public Model SaveModel(Model model)
    {
        try
        {
            var saved = _repo.Save(model);
            if (!saved)
            {
                _log.Log("Failed to save");
            }
            return model;
        }
        catch (Exception ex)
        {
            _log.Log(ex.Message);
            throw;
        }
    }
}