* This is useful if the given service uses daemon threads, and we want to keep the JVM from
   * exiting immediately on shutdown, instead giving these daemon threads a chance to terminate
   * normally.
   *
   * @param service ExecutorService which uses daemon threads
   * @param terminationTimeout how long to wait for the executor to finish before terminating the
   *     JVM

            tg.enumerate(ts);

            for (Thread active : ts) {
                String name = active.getName();
                boolean daemon = active.isDaemon();
                assertTrue(daemon, name + " is no daemon Thread.");
            }
        }

        assertTrue(seen, "Could not find ThreadGroup: " + DefaultArtifactResolver.DaemonThreadCreator.THREADGROUP_NAME);
    }

    @Test

    return this;
  }

  /**
   * Sets daemon or not for new threads created with this ThreadFactory.
   *
   * @param daemon whether or not new Threads created with this ThreadFactory will be daemon threads
   * @return this for the builder pattern
   */
  @CanIgnoreReturnValue
  public ThreadFactoryBuilder setDaemon(boolean daemon) {
    this.daemon = daemon;
    return this;
  }

  /**

 * on single thread, keeping the listener logic simple. This listener also blocks on last transfer event to allow
 * output to perform possible cleanup. It spawns a daemon thread to consume queued events that may fall in even
 * concurrently.
 *
 * @since 4.0.0
 */
public final class SimplexTransferListener extends AbstractTransferListener {

            throws ArtifactResolutionException, ArtifactNotFoundException {
        resolve(artifact, remoteRepositories, localRepository, null);
    }

    /**
     * ThreadCreator for creating daemon threads with fixed ThreadGroup-name.
     */
    @Deprecated
    static final class DaemonThreadCreator implements ThreadFactory {

   */
  long millisElapsedSince(long startNanoTime) {
    return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
  }

  /** Returns a new started daemon Thread running the given runnable. */
  Thread newStartedThread(Runnable runnable) {
    Thread t = new Thread(runnable);
    t.setDaemon(true);
    t.start();
    return t;
  }

  /**

   */
  long millisElapsedSince(long startNanoTime) {
    return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
  }

  /** Returns a new started daemon Thread running the given runnable. */
  Thread newStartedThread(Runnable runnable) {
    Thread t = new Thread(runnable);
    t.setDaemon(true);
    t.start();
    return t;
  }

  /**

        new ThreadPoolExecutor(1, 2, 3, SECONDS, new ArrayBlockingQueue<Runnable>(1));
    assertNotNull(application.getExitingExecutorService(executor));
    assertTrue(executor.getThreadFactory().newThread(EMPTY_RUNNABLE).isDaemon());
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testGetExitingExecutorService_executorDelegatesToOriginal() {

# Eine Response direkt zurückgeben

Wenn Sie eine **FastAPI** *Pfadoperation* erstellen, können Sie normalerweise beliebige Daten davon zurückgeben: ein `dict`, eine `list`e, ein Pydantic-Modell, ein Datenbankmodell, usw.

Standardmäßig konvertiert **FastAPI** diesen Rückgabewert automatisch nach JSON, mithilfe des `jsonable_encoder`, der in [JSON-kompatibler Encoder](../tutorial/encoder.md){.internal-link target=_blank} erläutert wird.

Beachten Sie, dass Sie das Bild direkt mit einer `FileResponse` zurückgeben müssen.

///

/// info

Sofern Sie in Ihrem Parameter `responses` nicht explizit einen anderen Medientyp angeben, geht FastAPI davon aus, dass die Response denselben Medientyp wie die Haupt-Response-Klasse hat (Standardmäßig `application/json`).