Completely agreed.
Regarding test UDF's, we should be able to create custom test UDF's in
src/test/{scala,java} which will get compiled into jars and put on the
class path only during testing. Daffodil should be able to find them
just like it would find any other jar on the classpath, allowing us to
fully exercise UDF capabilities (including broken UDFs) without
polluting daffodil proper.
On 9/6/19 11:31 AM, Beckerle, Mike wrote:
> re: Design-for-Test for UDF facility
>
>
> When this code gets to code review with tests one of the key things will be
> that we get decent diagnostics from this for all the things users can do
> wrong in creating the UDF jar, such as not having it be found, not having all
> the classes in it, not having them named right or derived properly, etc. etc.
> First cut is errors should be throwing a Daffodil-defined exception object,
> which encapsulates whatever exception object the actual underlying UDF
> reflection code or Service API call throws.
>
>
> Regression testing this UDF facility will require some trickery, as some
> tests will not be ordinary JUnit-style tests, as incorrectly-constructed jars
> have to be created and used.
>
>
> I recommend that we add some "official" UDFs to daffodil that are always part
> of the standard build, not because they are useful, but because they allow us
> to test the UDF system.
>
>
> An important test case is also to define such a UDF which throws an
> exception, so that we can have tests that verify the exception is properly
> caught and reported.
>
> ________________________________
> From: Kilo, Olabusayo <ok...@tresys.com>
> Sent: Friday, September 6, 2019 10:30 AM
> To: dev@daffodil.apache.org <dev@daffodil.apache.org>
> Subject: [DISCUSS] User Defined Functions Capability
>
> I'm requesting a discussion on the addition of the User Defined Functions
> capability to daffodil. The proposal referenced below provides a possible
> solution for Daffodil to be able to process and use User Defined Functions
> referenced in the DFDL Schema.
>
> The original request can be found at
> https://issues.apache.org/jira/browse/DAFFODIL-2186 and the proposal can be
> found
> https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+User+Defined+Functions.
>
