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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: Exception when caching a SelectQuery with prefetching [WAS: Caching]
Date Thu, 20 May 2010 12:26:58 GMT
Yeah, wouldn't hurt to have a record of this case. Maybe we'll come up  
with some solution, or at least do a bit more testing.

Andrus

On May 20, 2010, at 3:22 PM, Gary Jarrel wrote:

> Yes this was in fact the case, works fine with in memory caching.
>
> Should I still lodge a ticket?
>
> G
>
> On Thu, May 20, 2010 at 6:14 PM, Andrus Adamchik <andrus@objectstyle.org 
> > wrote:
>> One thing to keep in mind here is that OSQueryCacheFactory is not  
>> tested
>> with persistent cache... It works perfect with in-memory cache, but  
>> I always
>> thought that persisting the data that is sort of already persisted  
>> in the DB
>> doesn't buy us much, so that scenario never got any attention. E.g. I
>> wouldn't be surprised if de-serialization of the cache causes even  
>> more
>> issues.
>>
>> Andrus
>>
>>
>> On May 20, 2010, at 10:03 AM, Andrey Razumovsky wrote:
>>
>>> Looks like a bug. Could you please open a ticket?
>>>
>>> 2010/5/20 Gary Jarrel <garyjarrel@gmail.com>
>>>
>>>> Hi,
>>>> I managed to get the cache issue described below resolved, my error
>>>> with the DataContextFilter that I was using and it was  
>>>> overwriting the
>>>> modeler configuration when initializing shared config.
>>>>
>>>> I've ran into another issue with the following code:
>>>>
>>>> SelectQuery q = proto.queryWithParameters(params);
>>>> q.addPrefetch(RichProduct.MANUFACTURER_PROPERTY);
>>>> q.addPrefetch(RichProduct.RAW_PRODUCT_PROPERTY);
>>>> q.setCacheStrategy(QueryCacheStrategy.SHARED_CACHE);
>>>> q.setCacheGroups("products");
>>>>
>>>> Upon execution of this query I get the following exception:
>>>>
>>>> ERROR  
>>>> com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache
>>>> [oscache] Exception persisting RichProduct/subCategory =
>>>> <ObjectId:SubCategory, category_id=1,
>>>> id=1>/categoryName/subCategoryName/cost
>>>> com 
>>>> .opensymphony.oscache.base.persistence.CachePersistenceException:
>>>> Unable to write
>>>> '/tmp/cache/application/ 
>>>> 0/0/5/005126BC80FABAA4C582919EDF0B9304.cache'
>>>> in the cache. Exception: java.io.NotSerializableException, Message:
>>>> org.apache.cayenne.access.ListWithPrefetches
>>>>      at
>>>>
>>>> com 
>>>> .opensymphony 
>>>> .oscache 
>>>> .plugins 
>>>> .diskpersistence 
>>>> .AbstractDiskPersistenceListener 
>>>> .store(AbstractDiskPersistenceListener.java:376)
>>>>      at
>>>>
>>>> com 
>>>> .opensymphony 
>>>> .oscache 
>>>> .plugins 
>>>> .diskpersistence 
>>>> .AbstractDiskPersistenceListener 
>>>> .store(AbstractDiskPersistenceListener.java:238)
>>>>
>>>> <rest of stack trace removed>
>>>>
>>>> If I however remove the prefetches then the caching works fine.
>>>>
>>>> Looking at the source code for ListWithPrefetches it does not
>>>> implement Serializable, could this be the reason for it, or am I
>>>> missing something!
>>>>
>>>> Thank you
>>>>
>>>> Gary
>>>>
>>>> On Wed, May 19, 2010 at 6:17 PM, Gary Jarrel <garyjarrel@gmail.com>
>>>> wrote:
>>>>>
>>>>> Hi Guys,
>>>>> I seem to full of questions today!
>>>>> In the modeler I've got  
>>>>> org.apache.cayenne.cache.OSQueryCacheFactory for
>>>>
>>>> Query Cache Factory, 5000 objects and using shared cache.
>>>>>
>>>>> I can see OSCache initializing in the logs and everything  
>>>>> appears to be
>>>>
>>>> fine.
>>>>>
>>>>> However when I try to get the cache from the ObjectContext like  
>>>>> so:
>>>>> QueryCache cache = ((BaseContext)  
>>>>> getObjectContext()).getQueryCache();
>>>>> The cache that is being returned is
>>>>
>>>> the org.apache.cayenne.cache.MapQueryCache
>>>>>
>>>>> I've traced the calls and can see that the call got  
>>>>> getQueryCache() goes
>>>>
>>>> to MapQueryCacheFactory despite the fact that the modeler
>>>> specifies OSQueryCacheFactory
>>>>>
>>>>> Am I doing something wrong here?
>>>>> Thank you
>>>>> Gary
>>>>
>>>
>>>
>>>
>>> --
>>> Andrey
>>
>>
>


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