Ah, so I figured out what is going on with this. This is the code that is running in production, the SDK does not have a serializable version of LazyList as we don't explicitly support it through the interface. 1.5.1 will have these changes in the SDK though.
On Fri, Jun 10, 2011 at 9:44 AM, Alfred Fuller < arfuller+appeng...@google.com> wrote: > Hmm. The one on code.google.com seems to be out of date. The version > shipping with the SDK has: > > private final transient > QueryResultIteratorImpl<https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/QueryResultIteratorImpl.java&ct=xref_jump_to_def&l=27> > resultIterator<https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_usages&gs=java:Lcom/google/appengine/api/datastore/LazyList;.resultIterator)Lcom/google/appengine/api/datastore/QueryResultIteratorImpl;&l=32&gsn=resultIterator> > ; > > ... > > /** * Custom serialization logic to ensure that we read the entire result > set * before we serialize. */ private void writeObject > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_usages&gs=java:Lcom/google/appengine/api/datastore/LazyList;.writeObject(Ljava/io/ObjectOutputStream;)V%257CLjava/io/IOException;&l=354&gsn=writeObject>(ObjectOutputStream > > <http://www.google.com/url?sa=D&q=http%3A%2F%2Fjava.sun.com%2Fjavase%2F6%2Fdocs%2Fapi%2Fjava%2Fio%2FObjectOutputStream.html> > out > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_usages&gs=java:Lcom/google/appengine/api/datastore/LazyList;.writeObject(Ljava/io/ObjectOutputStream;)V%257CLjava/io/IOException;%23out&l=354&gsn=out>) > throws IOException > <http://www.google.com/url?sa=D&q=http%3A%2F%2Fjava.sun.com%2Fjavase%2F6%2Fdocs%2Fapi%2Fjava%2Fio%2FIOException.html> > { // Resolve all data before we serialize. resolveAllData > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_jump_to_def&l=52>(); > // Get ahold of the cursor before we serialize. cursor > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_jump_to_def&l=43> > = getCursor > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_jump_to_def&l=340>(); > out > <https://cs.corp.google.com/#google3/java/com/google/appengine/api/datastore/LazyList.java&ct=xref_jump_to_def&l=354>.defaultWriteObject > > <http://www.google.com/url?sa=D&q=http%3A%2F%2Fjava.sun.com%2Fjavase%2F6%2Fdocs%2Fapi%2Fjava%2Fio%2FObjectOutputStream.html%23defaultWriteObject()>(); > } > > > On Thu, Jun 9, 2011 at 4:12 PM, Jeff Schnitzer <j...@infohazard.org>wrote: > >> On Thu, Jun 9, 2011 at 3:30 PM, Alfred Fuller >> <arfuller+appeng...@google.com> wrote: >> > >> > Funny because we actually don't have this feature in python (only >> iterators >> > async prefetch). Ya, I would hope coders would use asIterable() when >> doing a >> > single for loop. The real win for asList() async prefetch is in these >> > situations: >> > List l = q.asList(); // returns immediately >> > .... other work/rpcs... >> > ... use l ... >> > and >> > // Launches and runs both queries in parallel >> > List l1 = q1.asList(); // returns immediately >> > List l2 = d2.asList(); // returns immediately >> > ... use l1 and l2 ... >> >> Ah, that makes total sense. >> >> > The lazy list implementation in the low level is both lazy and >> serializable. >> > You should be able to do something similar in Objectify. >> >> This I don't understand. Looking at LazyList I see it references >> QueryResultIteratorImpl and has no way of fully populating itself on >> serialization. These classes might implement Serializable but you >> sure can't serialize them! At least not if you want a useful set of >> data on the other side. >> >> For example, this works right now: >> >> List<Foo> myRemoteMethod() { >> return ObjectifyService.begin().query(Foo.class).list(); >> } >> >> But unless I'm missing something really obvious, this will not work: >> >> List<Entity> myRemoteMethod() { >> return DatastoreServiceFactory.getDatastoreService.prepare(new >> Query("Foo")).asList(); >> } >> >> Jeff >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine" group. >> To post to this group, send email to google-appengine@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine?hl=en. >> >> > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
