On 4/8/07, Will Berger <[EMAIL PROTECTED]> wrote:
ok...here they are.
cacheFilter - what does it do and how is it used
This is not used - if you look you'll see it's filter-mapping is
commented out. It can be used to cache requests by mapping it to
particular URLs. OSCache also has JSP tags that you can use to cache
specific portions of your page.
clickstreamFilter - seems to catputre some metrics. Not sure when it is
invoked
You're correct, this filter just captures where the user clicked. Can
be used for statistics. We've thought about replacing it with
MessAdmin - since MessAdmin seems to be a more active project and
provides the same functionality and more.
http://messadmin.sourceforge.net/
encodingFilter- what does it do and how is it used
This filter allows foreign characters and i18n support work much
better. See this filter's javadocs for more information:
http://www.springframework.org/docs/api/org/springframework/web/filter/CharacterEncodingFilter.html
gzipFilter- what does it do and how is it used
This compresses the response to the user by up to 70%. This is
particularly useful for compressing JavaScript and CSS. The following
is a good article to read to understand the usefullness of this class.
http://www.onjava.com/pub/a/onjava/2003/11/19/filters.html
lazyLoadingFilter
Used for Hibernate lazy-loading. We've disabled it in the next
release since we don't need it in the core and it prevents us from
easily switching DAO Frameworks. If you initialize all your lazy
collections in your DAO layer or middle-tier, you won't need this
filter.
localeFilter - does something with i118n?
Yes, it allows i18n switching by passing in a "locale" parameter. It
also sets the user's locale on a ThreadLocal so you can read it in any
layer of the application.
rewriteFilter- when and how is this used,
It's not used by most frameworks (except Struts 2), but it's available
for use. It's similar to Apache's mod_rewrite and allows you to
beautify URLs and all kinds of other things.
http://tuckey.org/urlrewrite/
securityFilter - understand when it is called, how does it fit in the
chain
of filters?
It delegates to Acegi Security and prevents users from accessing certain
URLs.
sitemesh - I believe this is themes when is it called in relation to the
other filters?
All the filters are called in the order they're specified in web.xml.
struts-cleanup - ?
I believe this is mainly required if you're using SiteMesh with Struts
2. Confirmed by its javadocs:
http://struts.apache.org/2.0.6/struts2-core/apidocs/org/apache/struts2/dispatcher/ActionContextCleanUp.html
struts - Assume this is the front servlet that dispatches all action
requests?
Yes, it's mapped to /* so it can do things like add CSS and JavaScript
to the <head> (if you have an <s:head> tag there. The extension
that's used is configured in struts.xml.
Hope this helps!
Matt
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