New Castle Windsor feature – debugger diagnostics

What you’re seeing here, is a feature in very early stages of development. It’s very likely to change in the very near future, hopefully based on your feedback which I’m looking forward to.

It is often the case with IoC containers, especially when registering components by convention, that you end up with misconfigured components, or with an exception saying that your component can’t be resolved. To aid working in these situations StructureMap provides methods like WhatDoIHave and AssertConfigurationIsValid. That’s the only container I know of that provides this kind of diagnostics.

Windsor also has similar ability to StructureMap’s WhatDoIHave method. It’s very powerful as well, since Windsor tracks internally the entire graph of objects and lets you access it you can for example visualize it.

The AssertConfigurationIsValid is a tougher nut to crack. Thing is – you can’t really say when the configuration is valid in any non trivial situation. You can’t say when it’s non-valid either. The reason for that is that there are multiple dynamic moving parts that you can’t really statically analyse to output a yes/no value.

What Windsor does

To help with these situations when debugging, in Windsor 2.5 I added debugging proxies to the most important classes in Windsor, so that when looking at them in the debugger you will be presented with much more helpful view of what’s in the container and what’s potentially not right.

debugger_visualizer

You will see a very minimalistic view of what’s going on in the container:

  • All components – will give you a list of all existing components in the container, kind of like WhatDoIHave
  • Facilities will give you the list of the installed facilities
  • Potentially misconfigured components – this is a list of components that don’t look to good to Windsor and may have some dependencies missing. It also is a very simplified view. At the first glance it will only tell you the key of the component (in this case fully qualified name), slash service/implementation. In this case both service and implementation are the same, so it won’t repeat the information.
    When you drill down, you will also see the lifestyle of the component and most importantly its status, which will tell you why Windsor thinks there may be something wrong with the component.

debugger_visualizer2

This pretty nicely tells you what might be wrong. If you are sure you providing these values dynamically, be it from the call site or via dynamic parameters, you can move on, otherwise it can remind you of the missing dependencies.

I want your feedback

How do you like this feature? How would you change it? What other information you think would be useful in this view? Leave a comment, or go to uservoice site to share your ideas.

Thanks


Posted 07-03-2010 2:09 AM by Krzysztof Koźmic
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Comments

mick wrote re: New Castle Windsor feature – debugger diagnostics
on 07-09-2010 5:35 AM

excellent stuff. is it logged to the output window?

Krzysztof Koźmic wrote re: New Castle Windsor feature – debugger diagnostics
on 07-11-2010 9:42 AM

Mick,

it's not - it's a On-Demand diagnostics. I use it when the container throws exception at me to see what is misconfigured and why.

Logging in Windsor, similar to what is in DynamicProxy is planned for vNext.

We accept patches :)

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