Hi Geoff,
Geoff Groos wrote:
> Thanks Jörg,
>
> I created an account but have run into some http:500s and what-not from
> jira while creating my account. I'll create the issue when I get all this
> stuff sorted out.
>
> The second question I have, semi-related, is how would you guys suggest
> doing generational (ie cross-model-version) testing?
>
> What I'd like to do is have tests like this:
>
> public static class TestFixture{
>
> public static class MyModel{ //v1
> Public int x;
> Public int y;
> }
>
> //And attempt to deserialize (using our moderately customized xstream
> serializer) it as
>
> public static class MyModel{ //v2
> Public int x;
> Public int y;
> Publix int z;
> }
>
> //in something like this
> @Test
> public void
>
when_we_added_an_extra_int_field_for_feature_1234_we_didnt_break_anything_because_our_deserialization_flow_is_so_nifty()
{
> //setup
> OurSerializerThatDelegatesToXStream serializer =
> testHarness.provideSerializer();
>
> //act
> String serialized = serializer.serialize(makeVersion1OfMyModel());
> MyModel myModelV2 = serializer.deserialize(serialized);
>
> //assert
> assertThat(myModelV2.z).followsProperDomainLogic();
> }
> }
>
> But of course Javac is going to complain about 2 'MyClass'es.
>
> Any suggestions?
Why don't you simply take the XML representation of model 1 and deserialize
it into model 2? Why do you still need to generate the XML representation of
model 1?
> I was thinking about trying using 2 different canonical names (so MyClass1
> and MyClass2), and then add an entry to the aliasMap as part of the setup
> logic to tell XStream that MyClass1 is-a MyClass2.
>
> But since that doesn’t involve nearly enough overly complex code, the
> other thing I was thinking of doing is copy-pasting class files around and
> then manually loading via some stupidly sophisticated mechanism. With a
> couple extra ant targets I could probably even make this bearable.
The strategy to handle newer versions of a class depends on the type of
modification. There's no general rule.
See http://xstream.codehaus.org/faq.html#Serialization_newer_class_versions
for some ideas.
Cheers,
Jörg
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