* element). Note that for an {@link Object#equals}-based multiset, this gives the same result as
   * {@link Collections#frequency} (which would presumably perform more poorly).
   *
   * <p><b>Note:</b> the utility method {@link Iterables#frequency} generalizes this operation; it
   * correctly delegates to this method when dealing with a multiset, but it can also accept any

     *            The workstation from which authentication is
     *            taking place.
     * @param flags the flags to use for the Type-3 message
     * @param nonAnonymous
     *            actually perform authentication with empty password
     * @throws GeneralSecurityException if a cryptographic error occurs
     * @throws CIFSException if a CIFS protocol error occurs
     */

    int required = allRequired[requiredChosen];

    // ...do the first selection...
    selectInPlace(required, array, from, to);

    // ...then recursively perform the selections in the range below...
    int requiredBelow = requiredChosen - 1;
    while (requiredBelow >= requiredFrom && allRequired[requiredBelow] == required) {

      assertTrue(queue.offer("blocksPutCallsUntilRemoved"));
      this.completed = new Completion(countdownInMillis);
      scheduleEnableWrites(this.queue, countdownInMillis);
    }

    /** Perform a {@code put} and assert that operation completed in the expected timeframe. */
    void putSuccessfully() {
      putUninterruptibly(queue, "");
      completed.assertCompletionExpected();

                // Clear session reference if mutable
                // Note: session field may be final, cannot be nulled
            }
        } catch (Exception e) {
            log.error("Failed to perform emergency tree cleanup", e);
        }
    }

    /**
     *
     * @return whether the tree is connected
     */
    public boolean isConnected() {

   *
   * @throws RuntimeException if timed out or interrupted while waiting
   */
  public static void awaitClear(WeakReference<?> ref) {
    awaitDone(() -> ref.get() == null);
  }

  /**
   * Tries to perform a "full" garbage collection cycle (including processing of weak references and
   * invocation of finalize methods) and waits for it to complete. Ensures that at least one weak

    @Test
    public void testMultipleKeyRotations() throws GeneralSecurityException {
        String sessionId = "multi-rotation";
        keyManager.storeSessionKey(sessionId, testKey, "AES");

        // Perform multiple rotations
        for (int i = 1; i <= 5; i++) {
            int version = keyManager.rotateSessionKey(sessionId);
            assertEquals(i, version, "Version should be " + i);
        }

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