Everything can be restored. Because everything is on disk.
yes but synching should be looked at. i think i go with jonathans idea that
i already was thinking of.
use a concurrent hashmap and then one entry is a list for one session.
then concurrency should be almost gone between sessions.
johan
On 2/14/07, Matej Knopp <[EMAIL PROTECTED]> wrote:
But cache is for caching things that are expensive to get, but when they
are evicted from cache, they can be restored. When you remove wicket
page (or better said page version) for wicket 2nd level store, it can
not be restored.
As for performance, the gain could be in finer grained synchronization,
as imho currently the synchronization is the bottleneck.
-Matej
Johan Compagner wrote:
> Its EXACTLY a cache
> What isn't a cache is ehcache
>
> At least not in my point of view
> A cache is something you cache something as good as you can but it can
> be gone at anytime.
> ehcache is not a cache. Its a in memory predefined size list. where some
> can drop of and others not
> thats not caching. Thats pooling
>
> And the current caching is because we don't version anything anymore in
> the undo buffer doesn't make much
> sense. Except if you really make new pages again for pretty much all the
> clicks/navigation that you do.
> Maybe we should cache the byte[] instead of the pages. What would cost
more?
>
> Because now if you are on page X version 0
> and you click and you go to Page X version 1
>
> then go back..
> Previously this was really still an in mem operation. Nowadays it is
> always a read from disk..
> maybe we should change that....
>
> and i am completely not suprised that ehcache was not performing better.
> How could it do that?? Where should the gain come from?
> The current impl really grows directly with the hardware you have.
> ehcache need to be tweaked exactly
> what your system can handle. What do you say then? 200 page? 2000 pages?
> What does that cost?
>
>
> johan
>
>
>
> On 2/14/07, *Matej Knopp* < [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
wrote:
>
> I've tried writing a IPageStore using ehcache today, the performance
> wasn't better than what we already have.
>
> And Wicket second level session store is not really a cache, it's
works
> differently.
>
> -Matej
>
> Eelco Hillenius wrote:
> > On 2/14/07, Andrew Klochkov < [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
> >> I looked at pages second level cache implementation in 1.3 and
> wonder
> >> why not to use ehcache instead?
> >
> > Exactly what I have advocated, and which is why it is had the
name
> > 'second level cache'. However, I don't think it should be the
> default,
> > but rather an (easy to configure) option to plugin anything you
like
> > as the 'second level cache', be that an actual caching
> implementation,
> > a database, (virtual) file system or something else.
> >
> >> It's much more intelligent, configurable
> >> and performant.
> >
> > Keep in mind that we're still in the early stages of it. We're
> > currently tweaking the hell out of it though implementing custom
> > serialization, saving changes in a different thread and only for
> later
> > versions than the last one (which we keep in memory) etc. The
> point is
> > that by doing it ourselves, we can tweak exactly for what is
needed
> > for Wicket.
> >
> >> For example, it can have part of cache in memory while
> >> swapping less frequently used pages on the disk.
> >
> > It's the idea that we'll have flow over support as well. I don't
know
> > whether LRU is the best mechanism though. There are probably
smarter
> > ways to do this for Wicket, like basing it on recent activity,
> > available memory/ number of active sessions. I don't know just
yet,
> > but it's something that is on our mind for investigating. First
> things
> > first though.
> >
> > Eelco
> >
> >
>
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