Java asynchronous return of CompletableFuture

Question

If we have AsyncResponse response variable we can write something like:
CompletableFuture#thenAccept(response::resume).
I don't understand how can we pass boolean resume(Object response) method from AsyncResponse class to thenAccept() which takes Consumer as parameter, because Consumer return void.

Can you try using thenApply(...)? – aydinugur Dec 26 '18 at 14:51 — aydinugur, Dec 26 '18 at 14:51
"How can we pass..." - by ignoring the return value. – M. Prokhorov Dec 26 '18 at 14:55 — M. Prokhorov, Dec 26 '18 at 14:55

score 2 · Accepted Answer · answered Dec 26 '18 at 14:57

2

The method reference will just ignore the return value. If you expand the method reference into an anonymous inner class, it would look like this:

completableFuture.thenAccept(new Consumer<Object>() {
        @Override
        public void accept(Object object) {
            response.resume(object);
        }
    });

answered Dec 26 '18 at 14:57

Wim Deblauwe

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`completableFuture.thenAccept(response::resume);` would be enough. – Nikolas Charalambidis Dec 26 '18 at 16:53

Java asynchronous return of CompletableFuture

1 Answers1