On Monday, January 15, 2018 at 4:03:11 PM UTC+1, Jan Blok wrote:
Hi,Would it be possible for GWTc to handle java.lang.FunctionalInterface as if it was jsinterop.annotations. JsFunction ?
No, if only because JsFunction has many constraints: http://www.gwtproject.org/javadoc/latest/jsinterop/annotations/JsFunction.html
The reason for asking is, I have this java code:public void transaction(Runnable runnable) {startTransaction();try {runnable.run();}finally {endTransaction();}}when I expose this method via jsinterop I get a warning "not usable from javascript"I intent to use it from JS/TS as: myJavaLib.transaction(() => doSomethingInTransaction(...)); but this is not possible unless I supersource java.lang.Runnable and add @JsFunction
You'd need to create an overload taking a JsFunction as input, and exposing that one.
@JsFunction @FunctionalInterface
interface TransactionCallback {
void run();
}
@JsMethod
public void transaction(TransactionCallback callback) {
startTransaction();
try {
callback.run();
} finally {
endTransaction();
}
}
// Note: not a @JsMethod
public void transaction(Runnable runnable) {
transaction((TransactionCallback) runnable::run);
}
It seems to me that @FunctionalInterface and @JsFunction are very similar already...
And this is why the javadoc for JsFunction recommends also annotating the interface with FunctionalInterface.
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