Re: [MERLIN] calling a merlin block from a struts action

[Stephen McConnell]

[EMAIL PROTECTED] wrote:

Okay, got it.

Unfortunatly, what i need is the opposit, not merlin running a
webserver/servletengine, but a appserver running the merlin
container.....
We have this as well!
I havn't committed it yet - waiting to get the revised bootstrap code in 
place.

I had a closer look at the bootstrap class of merlin, but isn't there an
easier way?
Yes - its comming.  We should be able to bring the bootstrapping code 
down to just a few lines - and consitent across all of the embedding 
scenarios.  The prerequisite to that is getting the repository stuff 
sorted (which is currently looking good).  From there we can put in a 
merlin testcase to enable validation and once we have the generic 
approach nailed down we can refactor all embedded scenartios currently 
available : the servlet,web-app component, abstract unit-test, maven 
deployment plugin, and cli loader.

Things are getting very close - and looking rather nice.

Stephen.




simon



-----Original Message-----
From: Stephen McConnell [mailto:[EMAIL PROTECTED] 
Sent: Freitag, 14. November 2003 17:44
To: Avalon framework users
Subject: Re: [MERLIN] calling a merlin block from a struts action



[EMAIL PROTECTED] wrote:

 

You wouldn't have the source for that demo available, by any chance?

   

It's available from CVS (inside the merlin package under the web/http 
directory)
But don't look at the examples as a reference - plans are to simplify
things (elimination of the exposure of the session manager - cleaner 
API, etc.).

The interesting things are the deployment descriptor.
http://dpml.net/avalon-http/block.xml
If you have Merlin installed, you can run the demo using the following 
command:
$ merlin http://dpml.net/avalon-http/block.xml

Then point you browser to http://localhost:8080/example/servlets

Stephen.

 

simon

-----Original Message-----
From: Stephen McConnell [mailto:[EMAIL PROTECTED] 
Sent: Freitag, 14. November 2003 17:24
To: Avalon framework users
Subject: Re: [MERLIN] calling a merlin block from a struts action



[EMAIL PROTECTED] wrote:



   

let's say i take the merlin tutorial hello example, and i call it from
  

     

a

   

struts action. How would i be obtaining a reference to the hello
component? I have absolutly no idea!
  

     

You do like jumping into the deep-end don't you!
In the avalon-http demo the system basically establishes a service 
manager and sets everything up so that you just grab the service
   

manager
 

from the servlet context and invoke lookup( "hello" );
 

  protected void doGet(HttpServletRequest req, HttpServletResponse
resp)
      throws ServletException, IOException
 {
      ServiceManager serviceManager =
        (ServiceManager) 
req.getSession().getAttribute(WebServer.SERVICE_MANAGER);
      Hello hello = (Hello )
serviceManager.lookup(Hello.class.getName());
      // do stuff
  }

Stephen.



   

Please help!



-----Original Message-----
From: Niclas Hedhman [mailto:[EMAIL PROTECTED] 
Sent: Freitag, 14. November 2003 09:26
To: Avalon framework users
Subject: Re: Apache avalon on j2ee server

On Friday 14 November 2003 15:57, [EMAIL PROTECTED] wrote:

  

     

So here goes my scenario:

I have both standalone (swt) and web (struts) clients and they need a
common core.
Now from your answer part 1 :
- "Fortress is a lighter-weight container, more suitable in a
"Request/Response"
, i guessed fortress'd be more suitable for the webcontext", but on
 

    

       

the

  

     

other hand:
- "Merlin kick-ass for more rigid application, either embedded into a
bigger "container ...</snip>
does confuse me a bit...
So, what would me more "j2ee" compatible, merlin or fortress?
 

    

       

I think you should stop thinking "container" for a second, and start
thinking 
"components".

This is exactly the beauty of multiple  container implementations of
  

     

the

   

same 
specification. With a little bit of caution, the components yu design
will 
work in all Avalon containers (perhaps ECM excempted).

Going back to the container issue. You can mix and match. Fortress as 
component manager inside Jetty, which is running as a component inside
     

 

Merlin? Sounds good?

Merlin hosting the SWT application? I can't see why not. Or do you use
an GUI 
Platform, such as Eclipse, you can either embed Merlin or Fortress.
  

     

Back

   

to 
the component issue, which container is depending more on memory
consumption 
vs features.



  

     

And in terms of future releases, will there always be merlin AND
fortress or is fortress "doomed" to take the same place as phoenix?
 

    

       

ALL software is doomed, just like any species (humans included) are
doomed. It 
is only a matter of how soon, and if it will evolve into something
     

else
 

or 
just sudden death.

I think a "light weight" container will "always" exist. But maybe in a
few 
years Merlin is de-composed into "building blocks" and you choose the 
features you need and get "weight" accordingly. And in such scenario 
Fortress' purpose cease to exist. Who knows?



  

     

Does either of the containers, or the framework itself support
       

cluster
 

functionality?
 

    

       

See separate mail.



  

     

How could i deploy comonents in a distributed environment and how
 

    

       

would

  

     

they communicate? Altrmi, rmi/iiop, jms, axis?
 

    

       

Yes ;o)
Merlin is not there yet. There are many intricate decisions to make
about this 
issue on the container level. However, Components can also provide
  

     

these

   

kind 
of services, but not as transparently.
Avalon is a horizontal framework and it doesn't provide you with the 
kitchen-sink, sorry to say. We try to solve the lowest-level problems
and we 
try to do it well. Before the component repository grows, our users
  

     

will

   

have 
the same problems, and ask the same questions about applicability.

We are trying to address the component shortage as well, and I
personally 
think that this is the most important issue to our users, not whether
the 
container is Merlin or Fortress, or to create Avalon Framework 5.

I hope you don't get discouraged by my inability to answer you
questions.
Niclas

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--

Stephen J. McConnell
mailto:[EMAIL PROTECTED]
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