Hi Andy, Thanks for your clarification
Andy Seaborne schreef op 15-1-2014 0:37: > (seem to have forgotten to "send" on an earlier version) > > On 14/01/14 10:59, Minto van der Sluis wrote: >> @Andy >> >> You're remark puzzles me. I know it's a quote from [1]. But is it to >> emphasize that I am correct or to tell me I'm incorrent? > > To my reading, your text is blurring the dataset/transaction distinction. > > e.g. Fuseki has one dataset and provide multiple transactions (each > request is a transaction) all the time. > >> >> dataset != transaction, but the example also shows that every thread has >> its own dataset. > > It's supposed to show getting a dataset somehow - not necessarily > creat it. > > In fact, there is only one internal object per location (per dataset > on disk). That's how coordination of multiple threads is done. > TDBFactory may returns different wrapper objects but inside there is > one master object per location. > > Andy > >> >> Regards, >> >> Minto >> >> Andy Seaborne schreef op 14-1-2014 10:45: >>> On 14/01/14 08:22, Minto van der Sluis wrote: >>>> Hi Folks, >>>> >>>> A reply [1] from Andy to one of my mails triggered me. I looked up >>>> the >>>> "serializable transactions" that Andy mentioned [2]. Especially the >>>> "Multi-threaded use" section caught my attention. If I read it >>>> correctly >>>> using a single dataset in multiple threads is discouraged. >>> >>> """ >>> While it is possible to share a *transaction* between multiple >>> threads, this is not encouraged. >>> """ >>> >>>> >>>> Looking at Clerezza's use of Jena's dataset I see no sign of >>>> multi-threading support. Might this be the cause of our >>>> ConcurrentModificationException perils? Am I on to something here? >>>> >>>> Please share your thoughts. >>>> >>>> Regards, >>>> >>>> Minto >>>> >>>> [1] >>>> http://mail-archives.apache.org/mod_mbox/clerezza-dev/201401.mbox/%3C52D41088.5070802%40apache.org%3E >>>> >>>> >>>> [2] http://jena.apache.org/documentation/tdb/tdb_transactions.html >>>> >>>> >>> >>> >>> >> >> > > > -- ir. ing. Minto van der Sluis Software innovator / renovator Xup BV Mobiel: +31 (0) 626 014541
