Hi dear Begining from GAE sdk 1.3.2 , there is query cursors and you can have more than 1000 result
On Mon, Apr 26, 2010 at 11:43 PM, Piotr Tarsa <piotr.ta...@gmail.com> wrote: > Hello, > > I want to use Wicket with GAE and exploit all GAE features but some > problems > arise. > > 1. I'm looking for a good solution for asynchronous simulteanous queries in > Wicket. DataStore has a functionality of asynchronous queries so I would > want to be able to fire various queries before rendering anything and then > return the actual model objects when rendering particular component. I > think > of an Interface (or, better, abstract class) extending IModel with an > additional method, name it prepareModel() which would run the asynchronous > query, so getObjet would just wait for the query to finish and then return > the result (this way total time spend of waiting for DataStore queries will > be at most equal to slowest query). DataStore entities are organized into > Entity Groups where there are ancestors and descendants. So sometimes to > find an object I must first find the ancestor. So I would want to fire the > prepareModel() for parent components first. > > 2. DataStore doesn't support joins internally and it's queries are limited > to 1000 results (this means that GQL COUNT will never return value higher > than 1000 even if there's more that 1000 entities that mets the > requirements). Instead DataStore provides cursors to retrieve more than > 1000 > results and GAE devs recommends using separate sharded counters instead of > GQL COUNT's (of course if the result would never exceed 1000 then we shall > use normal GQL COUNT). Are there any components (repeaters) in Wicket that > supports that approach? > > 3. I think that Wicket should be able to store pages from PageMap > independently. This way we could store pages in separate entities in > datastore (DataStore doesn't have schemas, one can store entities of any > form as every kind) so fewer bytes would be transmitted to and from > DataStore (Http Sessions are kept in MemCache and DiskStore). > > 4. How to inject an DataStore object in Models that will be testing > friendly? >
