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Date: Wed, 13 May 2009 15:28:28 +0200
Message-ID: <ee04ee7f0905130628q7a2cb554xbd4f6c2485727435@mail.gmail.com>
Subject: Re: 3.0 cache documentation
From: =?UTF-8?Q?Borut_Bol=C4=8Dina?= <borut.bolcina@gmail.com>
To: user@cayenne.apache.org
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Hi,

I am reading the cache docs now and have some suggestions and queations:

"QueryCache Management
The query cache provider is installed via
org.apache.cayenne.cache.QueryCacheFactory. The factory can be configured in
the Modeler for the DataDomain..."

Create a note that this functionality is not available in current release.

"...or set in code"

An example would be of great value.


Now a question. Let's say I create a select query on paintings with OSCache
cache group paintings. Lets say there are 3 paintings: p1, p2 and p3.

Now they are cached in object cache and in separete query cache? Two cache
entries?

Let's say I create another painting and insert it into the db. The new
painting p4 is now in object cache. If I want to have fresh list of
paintings, I now have to invalidate the paintings cache group in the
onCommit callback function. Is there an alternative, like simply adding this
p4 to cache group paintings?

If not, will the subsequent fetch contact the db for all p1-p4 or is there a
way that paintings will get fetched from object cache if they are there? I
want to avoid reading (tens of)thousands of rows because occasionally some
get inserted.

Regards,
Borut


2009/5/4 Andrus Adamchik <andrus@objectstyle.org>
>
> Finally got around to documenting how the caching works in the latest
Cayenne:
>
> http://cayenne.apache.org/doc/caching-and-fresh-data.html
>
> Note that the references to cache groups and factories configuration via
the Modeler are applicable to the trunk code (yet unreleased 3.0M6). 3.0M5
has all the same features, but working via the API.
>
> I tried to stay away from the implementation details and give a user
perspective instead. If there is still a feeling that the docs are lacking
in this area, please share your thoughts. I will try to address any
reasonable suggestions.
>
> Andrus

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