Yeah I saw that and was wondering how I can leverage the facility. I see alot
of potential here and have a lot of materials to go through in the sandbox.
Merlin looks very promising for LDAPd's embedded configuration. I'm very
excited.
Alex
>
> From: Stephen McConnell <[EMAIL PROTECTED]>
> Date: 2003/08/19 Tue AM 05:39:09 EDT
> To: Avalon framework users <[EMAIL PROTECTED]>
> Subject: Re: Questions regarding the Context interface
>
>
>
> [EMAIL PROTECTED] wrote:
>
> >Thanks very much - you were extremely thorough. I'll process your comments
> >now.
> >
>
> Actually I neglected to mention one of Merlin's more eosteric context
> management features. If you want to change the contextualization
> interface that is applied to a component - well - you can. For example,
> lets imagine you want to do something like:
>
>
> public void contextualize( MyContext context )
> {
> File dir = context.getDirectory(); // look dad - no casting
> }
>
>
> All you need to do is to write the interface, declare the context
> strategy dependency, provide a context handler extension, and your
> done. There is a tutorial on this subject in CVS under
> merlin/merlin-platform/tutorials/contextualization. Assuming you have
> built both avalon-sandbox/meta and avalon-sandbox/merlin, all you need
> to do to run the demo is:
>
> $ cd merlin/merlin-platform/tutorials/contextualization
> $ maven validate
>
> Stephen.
>
> >
> >Thanks,
> >Alex
> >
> >
> >
> >>
> >>From: Stephen McConnell <[EMAIL PROTECTED]>
> >>Date: 2003/08/18 Mon PM 01:02:29 EDT
> >>To: Avalon framework users <[EMAIL PROTECTED]>
> >>Subject: Re: Questions regarding the Context interface
> >>
> >>
> >>
> >>[EMAIL PROTECTED] wrote:
> >>
> >>
> >>
> >>>Hello,
> >>>
> >>>My questions regard the use of the Context interface. I have used the
less
> >>>portable means for getting a context object from the contextualize method
> >>>
> >>>
> >in
> >
> >
> >>>the past when using phoenix for my components - namely the following
form:
> >>>
> >>> public void contextualize( Context context )
> >>> throws ContextException
> >>> {
> >>> BlockContext tContext = ( BlockContext ) context;
> >>> }
> >>>
> >>>As you can see the BlockContext is from phoenix. I found myself doing
this
> >>>because I could get a path to the base phoenix directory via the
> >>>getBaseDirectory() method. I would like to use the recommended portable
> >>>mechanism now that LDAPd is going to use more than one container. The
> >>>question is how do I make the container add the appropriate Context
entry.
> >>>
> >>>
> >I
> >
> >
> >>>would image that would be container implementation specific. So how
would
> >>>
> >>>
> >I
> >
> >
> >>>add this entry using say Merlin and Fortress:
> >>>
> >>> <entry key="avalon:work" type="java.io.File"/>
> >>>
> >>>
> >>>
> >>>
> >>
> >>If you declare the following <entry/> declaration in a type descriptor
> >>(manually or via an @avalon.entry) then Merlin will take care of this
> >>for you. This declaration is based on the meta-info model declarations
> >>which means its as close as you can get to an Avalon standard.
> >>
> >> <context>
> >> <entry key="urn:avalon:home" type="java.io.File"/>
> >> </context>
> >>
> >>Please note that the following two file related keys are available
> >>(which is slighlty different to what you described above):
> >>
> >> "urn:avalon:work" - a transient directory that will be desoyed
> >> following decommissioning of the component
> >> "urn:avalon:home" - persistent directory for the component
> >>
> >>
> >>
> >>
> >>>to be able to get
> >>>
> >>> File workDirectory = ( File ) context.get( "avalon:work" ) ;
> >>>
> >>>as is the recommended way in the javadocs page for the Context interface
> >>>
> >>>
> >here:
> >
> >
> >>>
> >>>
> >>>
>
>>http://avalon.apache.org/framework/api/org/apache/avalon/framework/context/Context.html
>>
> >>
> >>
> >>
> >>If you want to use a friendly castable context interface then you need
> >>to declare this under the @avalon.context type="MyContextInterface" tag
> >>which generates the following:
> >>
> >> <context type="MyContextInterface">
> >> <!-- plus any entries -->
> >> </context>
> >>
> >>In your code you can safely case the supplied context to the declared
> >>interface just like you do in Phoenix. This is also covered by the
> >>meta-info model but Merlin is probably the only container to provide
> >>support for this capability at this time.
> >>
> >> public void contextualize( Context context )
> >> {
> >> MyContextInterface myContext = (MyContextInterface) context;
> >> File file = myContext.getMyFile();
> >> }
> >>
> >>There is also a working demonstration of this in the merlin tutorial
> >>content.
> >>
> >>$ cd merlin-platform\tutorials\context_casting
> >>$ maven
> >>$ merlin -execute target\classes
> >>
> >>[INFO ] (tutorial.hello): listing values resolved from domain specific
> >>context
> >>[INFO ] (tutorial.hello): supplied context class:
> >>tutorial.DemoContextProvider
> >>[INFO ] (tutorial.hello): name: hello
> >>[INFO ] (tutorial.hello): partition: /tutorial/
> >>[INFO ] (tutorial.hello): home: [you-directory]\home\tutorial\hello
> >>[INFO ] (tutorial.hello): temp: C:\TEMP\tutorial\hello
> >>
> >>Stephen.
> >>
> >>
> >>
> >>>
> >>>Thanks much,
> >>>Alex
> >>>
> >>>
> >>>
> >>>---------------------------------------------------------------------
> >>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>For additional commands, e-mail: [EMAIL PROTECTED]
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>--
> >>
> >>Stephen J. McConnell
> >>mailto:[EMAIL PROTECTED]
> >>http://www.osm.net
> >>
> >>Sent via James running under Merlin as an NT service.
> >>http://avalon.apache.org/sandbox/merlin
> >>
> >>
> >>
> >>
> >>---------------------------------------------------------------------
> >>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>For additional commands, e-mail: [EMAIL PROTECTED]
> >>
> >>
> >>
> >>
> >
> >
> >---------------------------------------------------------------------
> >To unsubscribe, e-mail: [EMAIL PROTECTED]
> >For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
> >
> >
> >
>
> --
>
> Stephen J. McConnell
> mailto:[EMAIL PROTECTED]
> http://www.osm.net
>
> Sent via James running under Merlin as an NT service.
> http://avalon.apache.org/sandbox/merlin
>
>
>
>
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>
>
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