protected void shutDown() throws Exception {}

  /**
   * Invoked to request the service to stop.
   *
   * <p>By default this method does nothing.
   *
   * <p>Currently, this method is invoked while holding a lock. If an implementation of this method
   * blocks, it can prevent this service from changing state. If you need to performing a blocking
   * operation in order to trigger shutdown, consider instead registering a listener and

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	m.mu.Lock()
	b, ok := m.buckets[bucket]
	if !ok {
		m.mu.Unlock()
		return
	}
	delete(m.buckets, bucket)
	m.mu.Unlock()

	// Since deletes may take some time we try to do it without
	// holding lock to m all the time.
	b.mu.Lock()
	defer b.mu.Unlock()
	for k, v := range b.caches {
		if time.Since(v.lastUpdate) > metacacheMaxRunningAge {
			v.delete(context.Background())
			continue
		}

	}

	DB.Migrator().DropTable(&Post{}, &Category{}, "post_categories")
	DB.AutoMigrate(&Post{}, &Category{})

	post := Post{
		Title: "Hello World",
		Categories: []*Category{
			{Title: "Coding"},
			{Title: "Golang"},
		},
	}

	if err := DB.Create(&post).Error; err != nil {
		t.Errorf("Failed, got error: %v", err)
	}
}

func TestGaussDBOnConstraint(t *testing.T) {

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      assertLockNotHeld()

      connection.updateConnectionFlowControl(read)
    }

    /**
     * Accept bytes on the connection's reader thread. This function avoids holding locks while it
     * performs blocking reads for the incoming bytes.
     */
    @Throws(IOException::class)
    internal fun receive(
      source: BufferedSource,
      byteCount: Long,
    ) {

	ttl  time.Duration
	done chan struct{}

	// buckets for expiration
	buckets []bucket[K, V]
	// uint8 because it's number between 0 and numBuckets
	nextCleanupBucket uint8
}

// bucket is a container for holding entries to be expired
type bucket[K comparable, V any] struct {
	entries     map[K]*Entry[K, V]
	newestEntry time.Time
}

// noEvictionTTL - very long ttl to prevent eviction

   *     the {@link ExecutionException} thrown by {@code input.get()} or, if {@code get()} throws a
   *     different kind of exception, that exception itself. To avoid hiding bugs and other
   *     unrecoverable errors, callers should prefer more specific types, avoiding {@code
   *     Throwable.class} in particular.

 * itself is reclaimable. <i>Weak</i> means that locks/semaphores are created lazily, and they are
 * allowed to be reclaimed if nobody is holding on to them. This is useful, for example, if one
 * wants to create a {@code Striped<Lock>} of many locks, but worries that in most cases only a
 * small portion of these would be in use.
 *

   *
   * @since 20.0
   */
  public static final MediaType BASIC_AUDIO = createConstant(AUDIO_TYPE, "basic");

  /**
   * Advanced Audio Coding. For more information, see <a
   * href="https://en.wikipedia.org/wiki/Advanced_Audio_Coding">Advanced Audio Coding</a>.
   *
   * @since 20.0
   */
  public static final MediaType AAC_AUDIO = createConstant(AUDIO_TYPE, "aac");

  /**