setTimeout using Java Thread

Question

Say I have this:

  private static ExecutorService executor = Executors.newFixedThreadPool(1);

  executor.execute(() -> {
     Thread.sleep(100);
      doSomething();
  });

since I am reusing a thread, I am blocking it if others want to use the thread. My question is - is there a way to simply register a callback, something like this:

   executor.execute(() -> {
        timers.setTimeout(() -> {  // imaginary utility
             doSomething();
        },100);
   });

is this possible with core Java?

I wonder if there is any relationship between CompletableFuture and the Future class in vertx — user5047085
– user5047085, Commented Feb 5, 2019 at 0:03
It’s unlikely - while Vert.x uses the JVM as a runtime environment, it doesn’t appear to borrow any of Java’s runtime libraries — MTCoster
– MTCoster, Commented Feb 5, 2019 at 0:06
@MTCoster yeah my primary fear is that CompletableFutures that don't access an event loop are just using Thread.sleep under the hood or something — user5047085
– user5047085, Commented Feb 5, 2019 at 0:15
Why does it matter whether it uses Thread.sleep()? The call to execute() returns immediately, so your main thread will continue to be responsive — MTCoster
– MTCoster, Commented Feb 5, 2019 at 0:17

user5047085 · Accepted Answer · 2019-02-05 00:01:15Z

3

Yeah it looks like this works fine, I tested it on Java 10:

CompletableFuture.delayedExecutor(1, TimeUnit.MILLISECONDS).execute(() -> {
    doSomething();
});

answered Feb 5, 2019 at 0:01

user5047085

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