Scott,
Thanks for the reply. I agree it should be possible, but these lines
from ReflectData, createSchema method:
} else if (GenericFixed.class.isAssignableFrom(c)) { // fixed
int size = c.getAnnotation(FixedSize.class).value();
schema = Schema.createFixed(name, null /* doc */, space, size);
} else if (IndexedRecord.class.isAssignableFrom(c)) { // specific
return super.createSchema(type, names);
execute INSTEAD of falling through to the else clause right afterwards
(which would be the desired behavior). Sorry, but I can't remember
which clause executed, it was one of the "isAssignableFrom"s that came
back true.
Having said all this, we have decided just to use jackson directly. It
looks like that is what avro uses internally, as well as what Spring
uses (also out of the box).
Joe
On 5/1/2012 7:30 PM, Scott Carey wrote:
On 4/23/12 10:37 AM, "Joe Gamache" <[email protected]
<mailto:[email protected]>> wrote:
Hello,
We have been using Avro successfully to serialize many of our
objects, using binary encoding, for storage and retrieval.
Although the documentation about the Reflect Mapping states:
This API is not recommended except as a stepping stone for
systems that currently uses Java interfaces to define RPC protocols.
we used this mapping as that recommendation did not seem to
apply. We do not use the serialized data for RPC (or any other
messaging system). In fact, this part has in-place for a while
and works exceptionally well.
Now we would like to "externalize" a smaller subset of the objects
for interaction with a WebApp. Here we would like to use the JSON
encoding and the "specific" mapping. We tried having this set
of objects implement "GenericRecord", however, this then breaks
the use of Reflection on these objects. [The
ReflectData.createSchema method checks for this condition.]
Can Avro be used to serialize objects one way, and externalize
them another? [The externalized objects are a subset of the
serialized ones.] Perhaps more generally, my question is: can
both binary encoding and JSON encoding be supported on overlapping
objects using different mappers? If yes, what is the best way to
accomplish this?
That should be possible. If not I think It is a bug. The Java
reflect API is supposed to be able to handle Specific and Generic
records, or at least there is supposed to be a way to use them both.
What is the specific error, from what API call? Perhaps it is a
simple fix and you can submit a patch and test to JIRA?
Thanks,
-Scott
Thanks for any help - I am still quite a noob here so I greatly
appreciate any additional details!
Joe Gamache
