It's been awhile since I've seen this video, so I'll have to go back to re-watch it in order to answer your question completely, but I'd be interested in seeing what you've sketched out so far and happy to give you my feedback on it.
- Jason On Tue, Jan 12, 2010 at 3:52 PM, Duong BaTien <[email protected]>wrote: > Hi Jason, the author Brett Slatkin and others: > > 1) For the list property, the video shows simple example of standard 1:n > Message Receivers in python and Java. It then demonstrates a very > efficient technique of Message and MessageIndex with the query of > MessageIndex in python (NO Java from then on). I look at both the low > level datastore with Query.setKeyOnly() and the query "select id from" > to get the results of List<Key>, then go through the loop to get the > receivers. I may miss something, since the python code looks so clean. > But once you are in any environment, it is very expensive to switch. > This technique has major impact in data modeling. > > 2) Again for the set intersection, the python code looks so clean. I > roughly sketch what need to be done on the Java side with either low > level of datastore or with JDO. It is still not elegant as the shown > codes. The demos are also in python. Again, the technique of merge join > will have very significant impact on data modeling that GAE may surpass > other platforms. > > Haven't put enough time in it yet, I wonder if any one has worked out > the demos in Java and suggested best practices in data modeling for a > complex large application. The job Brett Slatkin sets out to do has not > completed without the Java codes since GAE now supports Java. > > Thanks > Duong BaTien > DBGROUPS and BudhNet > > > On Tue, 2010-01-12 at 14:13 -0800, Jason (Google) wrote: > > Can you be more specific about what you're trying to accomplish so we > > don't have to search through the video to find what you're looking > > for? Or, at least provide a timeline reference that we can refer to in > > the video. :) > > > > > > Thanks, > > - Jason > > > > On Mon, Jan 11, 2010 at 7:29 AM, Duong BaTien <[email protected]> > > wrote: > > Hi: > > > > Is there any blog and/or note to apply list properties and > > merge-join in > > python as in the following talk and demos > > > http://code.google.com/events/io/2009/sessions/BuildingScalableComplexApps.htmlusing > Java and JDO? > > > > Thanks > > Duong BaTien > > DBGROUPS and BudhNet > > > > > > > > -- > > 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 google-appengine- > > [email protected]. > > To unsubscribe from this group, send email to google- > > > > [email protected]<appengine-java%[email protected]> > . > > For more options, visit this group at > > http://groups.google.com/group/google-appengine-java?hl=en. > > > > > > > > > > > > -- > > 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 google-appengine- > > [email protected]. > > To unsubscribe from this group, send email to google-appengine-java > > [email protected]. > > For more options, visit this group at > > http://groups.google.com/group/google-appengine-java?hl=en. > > > -- > 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]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > > >--
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