AspectSharp/docs/faq1.html

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  51                         <tr>
  52                                 <td>Aspect# - An AOP framework for the .NET</td>
  53                         </tr>
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  55
  56                 <h1><img src="http://aspectsharp.sourceforge.net/logo.gif" alt="Aspect# Logo. By Ricardo Aloise." /></h1>
  57
  58                 <p></p>
  59
  60 <h4>How to introduce AOP in a more transparent way?</h4>
  61
  62 <p>Well, there is no way to wrap instances without using an engine instance.
  63 Containers like Avalon Castle and SpringFramework can hide from the outside world
  64 the wrapping. But you can use some tricky to minimize the engine invocation.
  65 </p>
  66
  67 <p>
  68 Supposing that every IContentProvider implementation is created by a ContentProviderFactory,
  69 you can wrap the factory on the bootstrap of your application:
  70 </p>
  71
  72 <p class="code">
  73 public interface IContentProviderFactory <br/>
  74 {<br/>
  75 &nbsp;&nbsp;IContentProvider Create( String key );<br/>
  76 }<br/>
  77 <br/>
  78 public class DefaultContentProviderFactory : IContentProviderFactory<br/>
  79 {<br/>
  80 &nbsp;&nbsp;public IContentProvider Create( String key )<br/>
  81 &nbsp;&nbsp;{<br/>
  82 &nbsp;&nbsp;&nbsp;&nbsp;/// ...<br/>
  83 &nbsp;&nbsp;}<br/>
  84 }
  85 </p>
  86
  87 <p>Now we intercept all invocation to the Create method and wrap
  88 the returned content providers.</p>
  89
  90 <p class="code">
  91 import YourCompany.CMS.ContentProviders in YourCompanyAssembly<br/>
  92 import YourCompany.CMS.Aop.Interceptors<br/>
  93   <br/>
  94   aspect WrapContentProviderFactory for DefaultContentProviderFactory<br/>
  95   <br/>
  96   &nbsp;&nbsp;pointcut method(* Create(*))<br/>
  97   &nbsp;&nbsp;&nbsp;&nbsp;advice(ContentProviderFactoryInterceptor)<br/>
  98   &nbsp;&nbsp;end<br/><br/>
  99   end</p>
 100
 101 <p>And here is the interceptor implementation</p>
 102
 103 <p class="code"> public class ContentProviderFactoryInterceptor : IMethodInterceptor<br/>
 104   {<br/>
 105   &nbsp;&nbsp;public object Invoke(IMethodInvocation invocation)<br/>
 106   &nbsp;&nbsp;{<br/>
 107   &nbsp;&nbsp;&nbsp;&nbsp;object contentProvider = invocation.Proceed();<br/>
 108   &nbsp;&nbsp;&nbsp;&nbsp;return engine.Wrap( contentProvider );<br/>
 109   &nbsp;&nbsp;}<br/>
 110   } </p>
 111 <p>But if there's no aspect registered for the class? Don't worry, if the engine
 112   couldn't find an Aspect definition for the specified type it will return the
 113   instance itself.</p>
 114
 115
 116 <hr noshade>
 117 <p>20-09-04 - The Aspect# Team
 118 </p>
 119
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