wForget commented on PR #1819:
URL:
https://github.com/apache/incubator-uniffle/pull/1819#issuecomment-2185849947
> Maybe we can just use pure Java codes, something like:
>
> ```
> import java.util.concurrent.atomic.AtomicBoolean;
> import java.util.function.Supplier;
>
> public class FunctionUtils {
>
> public static <T> Supplier<T> once(Supplier<T> supplier) {
> return new Supplier<T>() {
> private final AtomicBoolean computed = new
AtomicBoolean(false);
> private T value;
>
> @Override
> public T get() {
> if (computed.compareAndSet(false, true)) {
> value = supplier.get();
> }
> return value;
> }
> };
> }
>
> public static void main(String[] args) {
> Supplier<String> supplier = () -> {
> System.out.println("Called only once");
> return "Hello, World!";
> };
>
> Supplier<String> memoizedSupplier = once(supplier);
>
> System.out.println(memoizedSupplier.get());
> System.out.println(memoizedSupplier.get());
> System.out.println(memoizedSupplier.get());
> }
> }
> ```
>
> Then we can avoid the Scala compatibility issue. WDYT?
`CompletionIterator$.MODULE$.apply` accepts Function0 type
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