assertFalse(segment.clearValueForTesting(key, hash, valueRef));
    segment.setWeakValueReferenceForTesting(entry, valueRef);
    assertTrue(segment.clearValueForTesting(key, hash, valueRef));
  }

  // reference queues

  public void testDrainKeyReferenceQueueOnWrite() {
    for (MapMaker maker : allWeakKeyStrengthMakers()) {
      MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(maker.concurrencyLevel(1));

        .socket(peer.openSocket().asBufferedSocket(), "peer")
        .pushObserver(IGNORE)
        .build()
    connection.start(sendConnectionPreface = false)
    val queues = taskRunner.activeQueues()
    assertThat(queues).hasSize(1)
  }

  private fun data(byteCount: Int): Buffer = Buffer().write(ByteArray(byteCount))

  private fun assertStreamData(
    expected: String?,
    source: Source?,

   * is not thread-safe.
   *
   * @param iterable the iterable to wrap
   * @return a view of the supplied iterable that wraps each generated iterator through {@link
   *     Iterators#consumingIterator(Iterator)}; for queues, an iterable that generates iterators
   *     that return and consume the queue's elements in queue order
   * @see Iterators#consumingIterator(Iterator)
   * @since 2.0
   */

   * is not thread-safe.
   *
   * @param iterable the iterable to wrap
   * @return a view of the supplied iterable that wraps each generated iterator through {@link
   *     Iterators#consumingIterator(Iterator)}; for queues, an iterable that generates iterators
   *     that return and consume the queue's elements in queue order
   * @see Iterators#consumingIterator(Iterator)
   * @since 2.0
   */

	select {
	case <-ctx.Done():
		// Returning error here is too noisy.
		return nil
	case c.outQueue <- msg:
		return nil
	}
}

// queueMsg queues a message, with an optional payload.
// sender should not reference msg.Payload
func (c *Connection) queueMsg(msg message, payload sender) error {
	// Add baseflags.
	msg.Flags.Set(c.baseFlags)

import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;

/**
 * Static utility methods pertaining to {@link Set} instances. Also see this class's counterparts
 * {@link Lists}, {@link Maps} and {@link Queues}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/CollectionUtilitiesExplained#sets">{@code Sets}</a>.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy

  Depending on the value returned from QueueingHintFn, the scheduling queue changes how it queues each Pod:
  - if more than one QueueingHintFn returns QueueImmediately, it queues Pod to activeQ.
  - If no QueueingHintFn returns QueueImmediately and more than one plugin returns QueueAfterBackoff, it queues Pod to backoffQ if Pod is backing off, or to activeQ if Pod's backoff has already finished.

      it.next();
      it.remove();
    }
    segment.evictEntries(entry);
    assertThat(map).hasSize(maxSize);
    assertThat(map).isEqualTo(originalMap);
  }

  // reference queues

  public void testDrainKeyReferenceQueueOnWrite() {
    for (CacheBuilder<Object, Object> builder : allKeyValueStrengthMakers()) {
      LocalCache<Object, Object> map = makeLocalCache(builder.concurrencyLevel(1));

      it.next();
      it.remove();
    }
    segment.evictEntries(entry);
    assertThat(map).hasSize(maxSize);
    assertThat(map).isEqualTo(originalMap);
  }

  // reference queues

  public void testDrainKeyReferenceQueueOnWrite() {
    for (CacheBuilder<Object, Object> builder : allKeyValueStrengthMakers()) {
      LocalCache<Object, Object> map = makeLocalCache(builder.concurrencyLevel(1));

  - apiserver_flowcontrol_current_r: R(the time of the last change in state of the queues)
  - apiserver_flowcontrol_dispatch_r: R(the time of the latest request dispatch)
  - apiserver_flowcontrol_latest_s: S(the request last dispatched) = R(when that request starts executing in the virtual world)
  - apiserver_flowcontrol_next_s_bounds: min and max next S among non-empty queues