A shared cache can be cleaned up by doing
DataDomain.getSharedSnapshotCache().clear(). Also I am in the process
of implementing a pluggable externally managed cache in 3.0:
http://issues.apache.org/cayenne/browse/CAY-613
Andrus
On Aug 2, 2006, at 2:41 AM, Borut BolÄina wrote:
> We are at architectural/design phase (cycle zero). No decision has
> yet been made. Is there an example for invalidating cache somewhere?
>
> bye,
> Borut
>
> On 31.7.2006 20:29, Tore Halset wrote:
>> Hello.
>>
>> On Jul 31, 2006, at 17:52, Borut BolÄina wrote:
>>
>>> I need an advice on using Cayenne in an environment where two
>>> PostgeSQL databases are configured to replicate from each other
>>> for failover capability.
>>
>> Are you using Sequoia[1] or slony[2] or creating your own solution?
>>
>>> I am thinking of two Cayenne enabled applications (load
>>> distribution) which insert records in one of those two databases.
>>> Application one (A1) inserts in database one (DB1) and
>>> application two (A2) inserts in database two (DB2).
>>>
>>> The insertion, deletion or update will cause Java triggers in
>>> PostgreSQL to call appropriate Java method in the application. If
>>> for any reason one of the databases is down for some time, the
>>> replication mechanism will bring the second database up-to date
>>> which will trigger invocations of the Java methods, so the second
>>> application will be in the correct state also.
>>>
>>> As long as triggers do not modify records, everything should be
>>> ok with Cayenne. In case, which I don't foresee now, the records
>>> will be modified on database level, all DataContexts should be
>>> invalidated, am I right?
>>
>> Cayenne has its own way of syncronizing cache[3] between app
>> instances. You could also invalidate cache manually.
>>
>> - Tore.
>>
>> [1] http://sequoia.continuent.org/HomePage
>> [2] http://gborg.postgresql.org/project/slony1/
>> [3] http://cwiki.apache.org/CAYDOC/configuring-caching-behavior.html
>>
>>
>
> --
> <blog-logo.gif>
>
> --
> NakljuÄna izjava tedna iz tednika Mladina:
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