Thanks craig for the answer, can you please tell me
what are the downside of using filter?i mean are there
any drawbacks if we have a filter like one of them
being performance?
Appreciate your help.
-
Thanks again,
Guru
--- "Craig R. McClanahan" <[EMAIL PROTECTED]> wrote:
>
>
> On Wed, 20 Feb 2002, GuruPrasad wrote:
>
> > Date: Wed, 20 Feb 2002 10:59:55 -0800 (PST)
> > From: GuruPrasad <[EMAIL PROTECTED]>
> > Reply-To: Tomcat Developers List
> <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]
> > Subject: Difference between Valve and
> javax.servlet.Filter?
> >
> > What are the difference between Valve and Filter?
> >
>
> Valves and Filters implement the same design pattern
> ("Chain of
> Responsibility" from the GoF book), so they can be
> used for similar sorts
> of things. However, there are a couple of key
> differences:
>
> * Filters are part of the servlet spec, and
> therefore portable
> to any Servlet 2.3 environment, while Valves are
> specific
> to Tomcat 4.x.
>
> * Filters have access to ServletRequest and
> ServletResponse objects,
> and can optionally wrap them to provide modified
> functionality.
> Valves have access to the internal Request and
> Response implementation
> objects, which have a lot more functionality --
> you can often
> implement things by calling a property setter on
> the object directly
> instead of by wrapping it.
>
> The rule of thumb to use: if you can implement your
> required
> functionality as a Filter or as a Valve, use a
> Filter to protect the
> portability of your application.
>
> > -
> > Thanks,
> > prasad
> >
>
> Craig
>
>
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