On 2020/02/23 23:14:32, Paul King <pa...@asert.com.au> wrote:
> Just for future reference, I'd probably start out with such a question on
> the users mailing list. There are more folks subscribed to that list and
> writing closures and transforms (using Groovy) are topics which that list
> covers. If it turned out that Groovy couldn't handle your use case, the dev
> list (developing the language) would be the place to go to ask whether a
> feature could be added to the language.
>
> Having said that, to answer your question, there are quite a lot of
> things that are possible. Perhaps you could give a concrete simple example
> of the kind of thing you are trying to do. I understand most of what you
> are saying but a few bits are still a little unclear (to me at least).
>
> Cheers, Paul.
>
>
> On Mon, Feb 24, 2020 at 9:06 AM Saravanan Palanichamy <chava...@gmail.com>
> wrote:
>
> > Hello
> >
> > Is it possible to do this in the groovy AST transformation ->
> >
> > a) in a code visitor, visit a closure expression (in the
> > INSTRUCTION_SELECTION phase)
> > b) Using the Closure Node, execute this code to determine its results
> > based on different parameters
> >
> > Essentially I want to be able to selectively run a closure defined in code
> > during the compile process. I see you can convert closures into strings, is
> > it possible to compile that string in the middle of a compile process?
> >
> > I am not sure this is the right forum for this question, please let me
> > know if otherwise
> >
>
Hello Paul
Thank you for your reply. I am trying to do this specific thing
a) I allow my developers to write Groovy scripts
b) I use the script as a DSL to generate actual configuration files needed for
my service at runtime.
c) Because I need to translate the code to configuration entries, I need to
execute some parts of the script to determine config values. For example
@Retry({new RetryParams(10, 20)})
void runSomeCodeInMyServer() {
}
In the code above, lets say this code runs on my server, but the server needs
to be told that the parameters for the thread that executes this is to retry it
10 times, with a 20 second interval.
When parsing the groovy script, I need to pull out these 10 and 20 numbers from
the script. One way to do this is visit the closure, see this was a constructor
call to RetryParams, and use the numbers there. This seems tedious given the
number of combinations possible. However if there was way for me to run this
closure during the AST transform, I can inspect the created retryparams object
to get my values. Does that make sense?
As I am typing this, I also realize that the closure may call other functions
which may need to be compiled as well (but I can create compile errors there to
keep it simple)
