// oldFuture completes.
    Runnable listener =
        () -> {
          if (taskFuture.isDone()) {
            // Since the value of oldFuture can only ever be immediateVoidFuture() or setFuture of a
            // future that eventually came from immediateVoidFuture(), this doesn't leak throwables
            // or completion values.
            newFuture.setFuture(oldFuture);

 *  Fix: Don't crash when the URL hostname contains an underscore on Android.
 *  Fix: Change HTTP/2 to use a daemon thread for its socket reader. If you've ever seen a command
    line application hang after all of the work is done, it may be due to a non-daemon thread like
    this one.
 *  New: Include suppressed exceptions when all routes to a target service fail.

`items` submodule’ünü doğrudan import ediyoruz; sadece içindeki `router` değişkenini import etmiyoruz.

Çünkü `users` submodule’ünde de `router` adlı başka bir değişken var.

Eğer şöyle sırayla import etseydik:

```Python
from .routers.items import router
from .routers.users import router
```

  }

  /**
   * Returns whether any threads are waiting to enter this monitor. Note that because cancellations
   * may occur at any time, a {@code true} return does not guarantee that any other thread will ever
   * enter this monitor. This method is designed primarily for use in monitoring of the system
   * state.
   */
  public boolean hasQueuedThreads() {
    return lock.hasQueuedThreads();
  }

  /**

     *
     * All that said, don't forget that everyone should call converter.convert() instead of
     * converter.apply(), anyway. If clients use only converter.convert(), then their nullness
     * checkers are unlikely to ever look at the annotations on this declaration.
     *
     * Historical note: At one point, we'd declared this method as accepting and returning nullable
     * values. For details on that, see earlier revisions of this file.

   * @since 31.0
   */
  @SafeVarargs
  public static <K, V> ImmutableBiMap<K, V> ofEntries(Entry<? extends K, ? extends V>... entries) {
    @SuppressWarnings("unchecked") // we will only ever read these
    Entry<K, V>[] entries2 = (Entry<K, V>[]) entries;
    return RegularImmutableBiMap.fromEntries(entries2);
  }

  /**

    // objects indefinitely.
    private void drainQueue() {
      Reference<? extends L> ref;
      while ((ref = queue.poll()) != null) {
        // We only ever register ArrayReferences with the queue so this is always safe.
        ArrayReference<? extends L> arrayRef = (ArrayReference<? extends L>) ref;

                    }
                    return;
                }
            }
        }

    }

    /*
     * Build a connection. Only one thread will ever call this method at
     * any one time. If this method throws an exception or the connect timeout
     * expires an encapsulating TransportException will be thrown from connect
     * and the transport will be in error.

    internal val lengths: LongArray = LongArray(valueCount)
    internal val cleanFiles = mutableListOf<Path>()
    internal val dirtyFiles = mutableListOf<Path>()

    /** True if this entry has ever been published. */
    internal var readable: Boolean = false

    /** True if this entry must be deleted when the current edit or read completes. */
    internal var zombie: Boolean = false

    /**

    assertMoreInvariants(map);
  }

  @SuppressWarnings("CollectionIncompatibleType")
  private void assertEntrySetNotContainsString(Set<Entry<K, V>> entrySet) {
    // Very unlikely that a buggy collection would ever return true. It might accidentally throw.
    assertFalse(entrySet.contains("foo"));
  }

  /**
   * Override this to check invariants which should hold true for a particular implementation, but