Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/142
So, I think the main disadvantage of using groovy or any of the scripting
engine integrations is speed and expressibility. Having a targeted domain
specific language is going to be a lot simpler to parse than something more
complex like groovy (or javascript for that matter). It's hardly even a
DSL, frankly, just the ability to compose functions, which seems like a
sweet spot between the expressivity and complexity. If we want to
implement a FieldTransformation which is a scripting language, there's
nothing keeping us from doing this. The other reason I like a simple DSL
with just function composition is that I'd *really* prefer to not give
users enough rope to hang themselves with here if we can help it. This DSL
really exposes only the things you can do in one line of code. If it's
more than one line of code, we should be considering that a feature in the
language.
If we really want to integrate a scripting engine in the future, we can
create a separate FieldTransformer to do it in just one class.
On Mon, Jun 13, 2016 at 9:38 AM, Nick Allen <notificati...@github.com>
wrote:
> Love the functionality that you are creating with this. I am curious if it
> would make more sense to provide this functionality via an existing
> JVM-capable language like Groovy, etc, rather than inventing our own DSL.
> At first glance, it seems there are a lot of advantages in doing it this
> way. What were the pros/cons when you thought through this?
>
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