Hey, Quoting Rickard Öberg <[email protected]>: > On 2010-10-01 23.40, Paul Merlin wrote: > > I face some issues using the Native rdf indexing service within a > > multi-threaded context. > > > > I have no code to share ATM that demonstrate the issue but if it is > > needed I'll be able to produce and share it next week. > > > > Let me explain my setup first : > > - my app is running in a container > > - on every http request I assemble and activate a qi4j app, process the > > request and then passivate the qi4j app > > - some base data is created in the qi4j app (entities inserted, indexed) > > Excuse my ignorance, but that sounds insane! Why are you not > instantiating and keeping the app? Are you seriously having several > instance of the same Qi4j app in parallel if there are concurrent > requests? No wonder there are concurrency issues...
Following what Niclas answered to Stanislav question about many paralled Qi4j apps, only the underlying indexer repository (sail) is causing me problems. > > How do you use indexing-rdf in multi-threaded contexts ? > > I have a servlet that instantiates the Qi4j app, and then delegate to it > on every request. No issues at all with concurrency. I use servlets in other projects and it's working flawlessly. In the project that caused me a headhache last friday the Qi4j app is behind stateless session beans facades (ejb). Because I want to use the filesystem based sail repository I reworked my ejb integration so there's now only one Qi4j app accessing it but it has drawbacks specifics to the ejb world. I should have given more context to my question. Quoting Niclas Hedhman <[email protected]>: > On Sat, Oct 2, 2010 at 3:44 PM, Stanislav Muhametsin > <[email protected]> wrote: > > This is actually quite interesting issue. I could check someday if > > qi4j-core at least is threadsafe in respect to having many parallel > > Qi4j-apps. > > It should be. AFAIK, there are no mutable static fields, so the entire > Qi4j instance should be "invisible" to other ones. Does this mean that if we use 'out of the jvm' stores and index (entitystore- rest, entitystore-sql, rdbms based sail repository or indexing-sql) we'll be able to run many paralled Qi4j apps ? /Paul _______________________________________________ qi4j-dev mailing list [email protected] http://lists.ops4j.org/mailman/listinfo/qi4j-dev
