1) DataContext dc = (DataContext) BaseContext.getThreadObjectContext();
2) The BaseContext (which is really a DataContext) will stay around as
long as the session does. I suppose you could always bind a new
context to the thread (to allow the old one to GC) or you could
invalidate objects when you are done using them. However, given that
you said you are reading in relatively few records, this may not be a
big win.
3) Once your session is gone, it would be hard to message the context
since it is also gone.
On Thu, Sep 17, 2009 at 9:42 AM, Joe Baldwin <jfbaldwi..arthlink.net> wrote:
> Michael,
>
> I just checked my web.xml and it appears am using the same filter
>
> <!-- Cayenne -->
> <context-param>
> <param-name>cayenne.configuration.path</param-name>
> <param-value>/WEB-INF/config/cayenne-files</param-value>
> </context-param>
> <filter>
> <filter-name>CayenneFilter</filter-name>
>
> <filter-class>org.apache.cayenne.conf.WebApplicationContextFilter</filter-class>
> </filter>
> <filter-mapping>
> <filter-name>CayenneFilter</filter-name>
> <url-pattern>/*</url-pattern>
> </filter-mapping>
>
> In the code I am accessing the BaseContext via the following call:
> ObjectContext oc = BaseContext.getThreadObjectContext();
>
> So, unless I have misread, it appears we are using almost exactly the same
> code.
>
> Questions:
> 1. I am not sure what you mean by "you could do a cast there".
> 2. Should I release this BaseContext and create a new one (as has been
> suggested) or should I simple rely on the BaseContext to manage the memory?
> 3. Is there some way to message the BaseContext to determine if it has
> properly released memory after a session is complete?
>
> Thanks,
> Joe
>
>
>
>
>
> On Sep 17, 2009, at 9:18 AM, Michael Gentry wrote:
>
>> Hi Joe,
>>
>> The fact that you are seeing a spike with 50-100 concurrent users
>> doesn't surprise me. After your sessions timeout, the memory usage
>> goes back down. This seems expected to me.
>>
>> As for my session-based filter, I'm pretty much using what Cayenne
>> provides. In my web.xml file for the servlet engine (Tomcat in your
>> case), I have:
>>
>> <filter>
>> <filter-name>Cayenne Filter</filter-name>
>>
>> <filter-class>org.apache.cayenne.conf.WebApplicationContextFilter</filter-class>
>> </filter>
>> <filter-mapping>
>> <filter-name>Cayenne Filter</filter-name>
>> <url-pattern>/*</url-pattern>
>> </filter-mapping>
>>
>> To get your context after that:
>>
>> private ObjectContext objectContext =
>> BaseContext.getThreadObjectContext();
>>
>> I think the filter actually creates a DataContext, so you could do a cast
>> there.
>>
>
>
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