On Sat, Jul 16, 2016 at 10:09 AM, Woonsan Ko <[email protected]> wrote: > Hi Marcel, > > I figured out my mistake! It works like a charm as expected and > described in the wiki page [1]. > So, even when retrieving a Binary value from existing property, the > following example works fine, too: > > Value value = prop.getValue(); > if (value instanceof JackrabbitValue) { > String contentId = ((JackrabbitValue) value).getContentIdentity(); > } > > My mistake was I didn't realize that DataStore component is optional, > so if not specified with any, no DataStore used by default. Not from > DataStore, no contentIdentity like you mentioned insightfully. :-) > > For others' information, I simply added the following for a simple H2 > based demo: > > <DataStore class="org.apache.jackrabbit.core.data.db.DbDataStore"> > <param name="url" value="jdbc:h2:file:${rep.home}/version/db"/> > <param name="databaseType" value="h2"/> > <param name="driver" value="org.h2.Driver"/> > <param name="minRecordLength" value="1024"/> > <param name="copyWhenReading" value="true"/> > </DataStore> > > By the way, minRecoredLength is 100 bytes by default, not 1024 bytes > as configured in the above example.
FWIW, the default values of minRecoredLength are different in each DataStore implementation. FileDataStore and DbDataStore have 100 bytes as default value, but CachingDataStore implementations such as S3DataStore have 16KB by default. Cheers, Woonsan > > Cheers, > > Woonsan > > [1] https://wiki.apache.org/jackrabbit/DataStore > > On Wed, Jul 13, 2016 at 8:52 AM, Woonsan Ko <[email protected]> wrote: >> Hi Marcel, >> >> On Wed, Jul 13, 2016 at 2:40 AM, Marcel Reutegger <[email protected]> wrote: >>> Hi, >>> >>> On 08/07/16 06:20, "Woonsan Ko" wrote: >>>>In my debugging, it hits >>>>org.apache.jackrabbit.core.value.BLOBFileValue#getDataIdentifier() >>>>when retrieving a binary value. The method is hard-coded to return >>>>null. Maybe I missed something... >>> >>> Only Binary objects served from a DataStore have an identifier. >>> Smaller binaries are usually inlined by the PersistenceManager. >>> IIRC the threshold is 4k. Maybe your test creates binaries smaller >>> than this threshold? >> >> I guess I already checked that possibility and made sure on binary >> from DataStore at the moment. >> But it reminds me of the possibility to put a debugger to see how >> PersistenceManager passes the DataIdentifier to DataStore through the >> stack trace. >> I'll take a look again later and let you know if I find anything interesting. >> >> Thanks, >> >> Woonsan >> >>> >>> Regards >>> Marcel >>>
