> On Friday 16 April 2004 11:39, Albert Kwong wrote:
> > What do you think?
>
> I think you have thrown in some fresh thinking into
the pot :o)
>
> However, maybe I am a bit tired, or maybe not smart
enough, but I have a bit
> of problems to realize all the details.
>
> Could you elaborate with a larger example;
>
> MyClientImpl --> InterceptorOne --> InterceptorTwo
--> MyServiceImpl
>
>
> The following things is a bit unclear;
>
> 1. How does InceptorOne and InterceptorTwo,
respectively, declare that they
> should be 'injected' where they are?
>
Here's the configuration. The container shall sort
out the execution order based on the 'order' attribute
of the intercept element.
<targets>
<target name='MyServiceImpl'>
<!-- nothing new here -->
</target>
<target name='InterceptorOne'>
<intercept order='1000'>
<source>MyServiceImpl</source>
</intercept>
</target>
<target name='InterceptorTwo'>
<intercept order='2000'>
<source>MyServiceImpl</source>
</intercept>
</target>
</targets>
> 2. You mentioned that the Proxy for AbcServiceImpl
is implementing
> AbcInterceptor (just like InterceptorOne and
InterceptorTwo above, I guess).
> What if the two interceptors above are removed from
the chain?
During deployment, the container can figure out the
interceptor sequence based on the order attribute.
The chain-of-responsibility pattern will only apply if
there is at least one interceptor.
Therefore, if the two interceptors are removed, the
MyServiceImpl will be called like normal components.
> 3. Is there something in the name between AbcService
and AbcInceptor?
Having a naming convention between the AbcService and
the AbcInterceptor is nice to have, but not absolutely
necessary. In the AbcService's meta tag, the
AbcService declares the type of the interceptor (
@avalon.interceptor type='AbcInterceptor' ). In my
redundant email, I made a little amendment where you
can declare @avalon.interceptor.skin for operations.
i.e.
/**
* @avalon.interceptor type='AbcInterceptor'
*/
public interface AbcService
{
/** this operation can be intercepted */
public String doAbc ();
/**
* This one forbids interception.
* @avalon.interceptor.skin
*/
public String doDef ();
}
With this setup, it shall be possible to generate the
AbcInterceptor.java file from the build process and
include it in the api package.
Albert
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