Hi blake, could you give me simple example on how to use the @version, or any reference material?
thanks! On Mar 9, 11:35 pm, Blake <[email protected]> wrote: > You could also go with the sharded counter strategy. The more shards > you have, the less the chance that you'll have a collision, and you'd > use @Version for optimistic locking on each shard. > > On Mar 9, 7:18 am, legendlink <[email protected]> wrote: > > > Thanks for the reply. > > > If memcache is used, how do I implement it so that the counter would > > always be updated and not be deleted? > > > On Mar 6, 4:35 am, "Ikai L (Google)" <[email protected]> wrote: > > > > Have you looked into Memcache's INCR? > > > >http://code.google.com/appengine/docs/java/javadoc/com/google/appengi..., > > > long) > > > > This'll do it atomically, but you run the risk of it being volatile, > > > so you'll have to account for that in your client code. > > > > On Tue, Mar 2, 2010 at 11:40 PM, legendlink <[email protected]> wrote: > > > > hi, i wanted to have a sequence generator that increments by x value > > > > everytime it generates a value. if i would create the sequence > > > > generator by using the datastore, it is likely that data contention > > > > would occurr if there is high access times. > > > > > i have looked into the sample code of max ross in the google code > > > > repository (SequenceExamplesJDO.java) and think this is limited to > > > > increment by 1 only and not increment by x value. > > > > > if sharding technique is used, my concern is that i might not get the > > > > right sequence. > > > > > what is the best/elegant way of doing sequence generator that > > > > increments x value? > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "Google App Engine for Java" group. > > > > To post to this group, send email to > > > > [email protected]. > > > > To unsubscribe from this group, send email to > > > > [email protected]. > > > > For more options, visit this group > > > > athttp://groups.google.com/group/google-appengine-java?hl=en. > > > > -- > > > Ikai Lan > > > Developer Programs Engineer, Google App > > > Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
