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POBreaking the "ubiquitous language" by having an IoC in Domain Model?
 

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  1. POBreaking the "ubiquitous language" by having an IoC in Domain Model?
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    <p>My question is about <a href="http://www.udidahan.com/2009/06/14/domain-events-salvation/" rel="nofollow">Udi's solution</a> to domain events, particularly the class <code>DomainEvents</code> (see code below)</p> <p>An excerpt from Udi's code. It lives domain model as a static class.</p> <pre><code>public static class DomainEvents { [ThreadStatic] //so that each thread has its own callbacks private static List&lt;Delegate&gt; actions; public static IContainer Container { get; set; } //as before //Registers a callback for the given domain event public static void Register&lt;T&gt;(Action&lt;T&gt; callback) where T : IDomainEvent { if (actions == null) actions = new List&lt;Delegate&gt;(); actions.Add(callback); } //Clears callbacks passed to Register on the current thread public static void ClearCallbacks () { actions = null; } //Raises the given domain event public static void Raise&lt;T&gt;(T args) where T : IDomainEvent { if (Container != null) foreach(var handler in Container.ResolveAll&lt;Handles&lt;T&gt;&gt;()) handler.Handle(args); if (actions != null) foreach (var action in actions) if (action is Action&lt;T&gt;) ((Action&lt;T&gt;)action)(args); } } </code></pre> <p>From the code above, the static member <code>IContainer</code> creates an ioc-container-dependency in the domain model. Though I am not really sure if Udi's <code>IContainer</code> is an interface or an actual IoC container.</p> <p>I don't see anything like this in his sample:</p> <pre><code>public interface IContainer { IEnumerable&lt;T&gt; ResolveAll&lt;T&gt;(); } </code></pre> <p>My 1st question is: <strong>What is this <code>IContainer</code> in the <code>DomainEvents</code> class?</strong> If it is truly an IoC container then doesn't it break the rule of <em>"not having an infrastructure in the domain"</em>? (Please correct me if I'm wrong)</p> <p>Isn't the idea of DDD is about separating the infrastructure from the domain? </p> <p>My 2nd question is: <strong>Does <code>DomainEvents</code> itself breaks the rule <em>"ubiquitous language of DDD"</em></strong>? Because it's implementation does not pertain to any domain.</p>
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    1. CORelated: http://stackoverflow.com/questions/13015486/using-ninject-with-udi-dahans-domain-events/13026232#13026232
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