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jOOλ is part of the jOOQ series (along with jOOQ, jOOX, jOOR, jOOU) providing some useful extensions to Java 8 lambdas.

There is a newer version: 0.9.15

package org.jooq.lambda;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.Executor;
import java.util.function.Supplier;

public final class Async {
    private Async() {

    }

    public static  CompletionStage supplyAsync(Supplier supplier) {
        return SameExecutorCompletionStage.of(CompletableFuture.supplyAsync(supplier), null);
    }

    public static  CompletionStage supplyAsync(Supplier supplier, Executor executor) {
        return SameExecutorCompletionStage.of(CompletableFuture.supplyAsync(supplier, executor), executor);
    }

    public static CompletionStage runAsync(Runnable runnable, Executor executor) {
        return SameExecutorCompletionStage.of(CompletableFuture.runAsync(runnable, executor), executor);
    }

    public static CompletionStage runAsync(Runnable runnable) {
        return SameExecutorCompletionStage.of(CompletableFuture.runAsync(runnable), null);
    }
}