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From "Matt Sgarlata" <>
Subject Re: [VOTE] Release Chain 1.0
Date Mon, 22 Nov 2004 03:55:51 GMT
Before a 1.0 release, I would like to suggest an alternative Context 
interface.  Sorry, I realize I'm getting to the game a little late ;)  I 
think it is inappropriate for Context to extend from Map, because a Context 
as defined in the Chain package isn't really a Map.  Maps are great, but for 
what the Chain package is trying to do they're probably overkill.  One 
testament to this fact is the incredible difficulty of implementing the 
ServletWebContext class.  Implementing methods like entrySet(), keySet(), 
and values() are a real pain, and the implementations are all O(n)... ouch.

Below is my suggested alternative interface.  It's simple by design, to make 
it easy to implement.

public interface Context {

    public String[] getPropertyNames() throws ContextException;

    public Object get(String propertyName) throws ContextException;

    public void set(String propertyName, Object propertyValue)
        throws ContextException;

I also am concerned that the ServletWebContext class exposes too much 
information that is specific to the presentation tier.  Even if a business 
object were to depend only on the Context interface, if a ServletWebContext 
was passed in, the business object would be tied to HTTP symantics with 
calls such as context.get("sessionScope.myBean.myProperty").  I would 
recommend a context simliar to the one available to the JST: let request 
attributes be a scratchpad and let session and application items be visible 
so long as they aren't blocked by a lower level.

For full javadoc on my ideas behind contexts, please see the 
net.sf.morph.Context class and the net.sf.morph.context.* package.  Also, 
take a look at net.sf.morph.context.ServletWebContext.  Here's a link to the 
Morph homepage where you can access the Morph API:

I'm not on SourceForge yet but I applied on Friday so hopefully I'll be 
there soon!

----- Original Message ----- 
From: "Martin Cooper" <>
To: <>
Sent: Sunday, November 21, 2004 6:01 PM
Subject: [VOTE] Release Chain 1.0

>I believe Chain is now sufficiently complete and stable to warrant an 
>official 1.0 release. There are no outstanding bug reports, and the 
>component is already in use in a number of projects.
> The plan is to release HEAD as Commons Chain 1.0 on completion of a 
> successful vote. I will be the release manager.
> ---------------------------------------------------------------
>  [ ] +1  I support this release and am willing to help
>  [ ] +0  I support this release but am unable to help
>  [ ] -0  I do not support this release
>  [ ] -1  I do not support this release, and here are my reasons
> ---------------------------------------------------------------
> Here is my own +1.
> --
> Martin Cooper
> ---------------------------------------------------------------------
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