218. Hooking task state

Starting with JDK 19, we can rely on Future.state(). This method computes the state of a Future based on the well-known get(), isDone(), and isCancelled(), returning a Future.State enum entry, as follows:

• CANCELLED – the task was canceled.
• FAILED – the task was completed exceptionally (with an exception).
• RUNNING – the task is still running (has not been completed).
• SUCCESS – the task was completed normally with a result (no exception).

In the following snippet of code, we analyze the state of loading the testing team members and act accordingly:

public static TestingTeam buildTestingTeam() 
       throws InterruptedException {
  List<String> testers = new ArrayList<>();
  try (ExecutorService executor 
      = Executors.newVirtualThreadPerTaskExecutor()) {
    List<Future<String>> futures = executor.invokeAll(
      List.of(() -> fetchTester(Integer.MAX_VALUE)...