Fwiw, here's a proof-of-concept annotation processor for
gwteventbinder:
https://gist.github.com/tbroyer/420004d02e905ba7ce9489d24d3bae72
(uses auto-service, auto-common, and JavaPoet)
It'll generate an EventBinder_Xxx class implementing EventBinder<Xxx> for
any class Xxx with methods annotated with @EventHandler, so you can replace
things like:
interface MyEventBinder extends EventBinder<Xxx> {}
private static final MyEventBinder eventBinder =
GWT.create(MyEventBinder.class);
with
private static final EventBinder<Xxx> eventBinder = new EventBinder_Xxx();
With a small modification to EventBinder (adding an inherited annotation),
one could write an annotation processor that's fully backwards-compatible
with the current approach. The GWT generator could be changed to simply
return the class generated by the annotation processor as a migration step
before you replace the GWT.create() with an explicit "new", something like:
interface MyEventBinder extends EventBinder<Xxx> {}
private static final MyEventBinder eventBinder = new
Xxx_MyEventBinderImpl();
Note that the annotation processor linked above does absolutely no error
handling and assumes the annotation is used "correctly" (one big difference
of annotation processors is that they're invoked even if the code wouldn't
compile, e.g. applying the annotation to a type whereas it only targets
methods, or if the value of the annotation properties don't have the
correct type, such as @EventHandler(42); with a GWT generator, those errors
would be caught earlier in the process so the generator is immune to them).
On Friday, June 2, 2017 at 8:47:38 PM UTC+2, Anders Forsell wrote:
>
> Yes, I'm just trying to move away from all GWT dependencies and hoping
> that once J2CL is open-sourced I'll transition to it without having to wait
> for GWT3.
>
> On Friday, June 2, 2017 at 7:10:24 PM UTC+2, Thomas Broyer wrote:
>>
>> GWT 3 will likely still have SimpleEventBus (and it would compile with
>> j2cl without change).
>>
>> And gwteventbinder could quite easily be ported to an annotation
>> processor.
>>
>
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