Hello Martin,
But how about such situation as follows. I can store bean-factory
object in application scope. I can use it in any action to perform
bean producing. But main idea of bean-factory is to perform
_automatic_ bean generation by name of the action. For example - in
struts-config or in external config file I define mapping between
action and some kind of bean. All beans from mappings must be created to
be ready to use it in appropriate actio at request processing phase before
Action.perfom method call. How can I do it without
extending ActionServlet? I think there is one way to implement this
with current struts API - extend ActionServlet and redefine
processPreprocess method to perform all 'before Action.perfom' stuff.
So struts control-gear can be extended to to register external classes
or servlets to perform some activity at key points of request
processing - ActionForm processing, Action processing, etc. Now it can
be implemented only via ActionServlet extending - is not scalable
solution for my mind.
Sunday, June 10, 2001, 11:20:22 PM, you wrote:
MC> I like this idea. I think David is right - a lot of people do extend
MC> ActionServlet just to initialize resources. While this idea wouldn't remove
MC> all of the reasons to build a custom servlet, it would provide a
MC> systematic - and potentially simpler - way to solve a common problem.
MC> --
MC> Martin Cooper
MC> ----- Original Message -----
MC> From: "David Winterfeldt" <[EMAIL PROTECTED]>
MC> To: <[EMAIL PROTECTED]>
MC> Sent: Sunday, June 10, 2001 11:37 AM
MC> Subject: Re: [PROPOSAL] Struts Extensions
>> It might be nice if there was a way to register an
>> interface with the ActionServlet in the config file
>> for it to initialize a service. All the
>> ValidatorServlet I made does is parse the xml file
>> with the Digester and put an object into application
>> scope. If a class could be registered, then a servlet
>> wouldn't hang around for no reason and it wouldn't
>> need to be defined in the web.xml. And it sounds like
>> a lot of people extend the ActionServlet just to
>> initialize resources on startup.
>>
>> David
>>
>> --- Ted Husted <[EMAIL PROTECTED]> wrote:
>> > I agree that most extensions would be best written
>> > as independant
>> > servlets that plug into the application alongside
>> > the Struts
>> > ActionServlet. Though, I'm not sure they would need
>> > to register with the
>> > ActionServlet to access other parts of the
>> > framework.
>> >
>> > I haven't worked with the Digester directly, but
>> > most of the other
>> > Struts services are already exposed through the
>> > application context.
>> > Custom tags, for example, already access the Action
>> > Mappings this way.
>> > So any other servlet in the application (since
>> > that's all JSP's are)
>> > should be able to do the same.
>> >
>> > Another example is the Generic Connection Pool. The
>> > datasource is
>> > exposed through the application context and other
>> > services, like the
>> > TagLibs JDBC tags, can use the pool without knowing
>> > anything about
>> > Struts (or Struts knowing anything about them).
>> >
>> > So I would suggest that if there are other services
>> > that an extension
>> > needs to share that we expose them through the
>> > Application context.
>> >
>> > Oleg V Alexeev wrote:
>> >
>> > > To support flexible extensions mechanism for
>> > struts there are can be
>> > > made some additions to the core structure of the
>> > framework -
>> > >
>> > > 1. Add ability to register components or external
>> > servlets (at
>> > > application level) via struts-config file.
>> > > 2. Give such external components or servlets
>> > ability to use action
>> > > mappings database from ActionServlet.
>> > > 3. Extend core API of struts to support pluggable
>> > extensions - for
>> > > example use event model or direct calls via
>> > registrations in action
>> > > mappiongs database.
>> > >
>> > > The best way for my mind is to write external
>> > servlets, register it in
>> > > struts ActionServlet and use it as external
>> > services. This approach
>> > > can be useful in case of mutliple ActionServlet
>> > instances in one
>> > > application - every ActionServlet subscribe to use
>> > and uses some
>> > > amount of external services.
>>
>>
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--
Best regards,
Oleg mailto:[EMAIL PROTECTED]
