> This is a really interesting point. I often talk to
> application developers who want to do this kind of thing.
>
> In my view, doing this is going against the grain of HTTP. It
> is not a connected protocol. It is a stateless
> request/response protocol.
>
> When people start pretending that it's connected (as
> application developers often want to do) the user interface
> often ends up being quite klunky. Users do notice. But they
> often don't complain about the actual problem (auto-polling
> or whatever). But I find that when the central problem is
> fixed they get happier.
It's always seemed to me that very quick tasks are fine -
which is what most text book examples seem to be - but
"real world" tasks quite often take a bit of time.
I keep going down the same paths..
Either I try to cache things on the server (Sessions or
ServletContext)
- which can get very bloated in the case of in-memory XML
Documents
which is what I use for my reporting (XML/XSLT)
OR
I do some generate-once-server-many times at the HTML level but
the
requests can all be for different date ranges/populations
OR
I avoid the above by doing dynamic queries - in which case
I need to try to optimize everything* (Java, Tomcat config,
XML structure, XSLT/Xpath structure, SQL/Stored Procs) to
make it fast AND tell the user to wait - which is where I
started this thread.
* - I realise that I should always be doing everything in the
most efficient way - but I'm only human and can't just spew
out "perfect" code - whatever that is.
>
> Authentication is actually why I built my version of the
> filter API which I later proposed to the Servlet team.
> Authentication is the one good reason for having filters in the spec.
Well it gets my vote - I tried all sorts of things for
authentication until I found Filters. That was a happy
day - well done!
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