assertLockNotHeld()

    val connection = this.connection
    if (connection != null) {
      connection.assertLockNotHeld()
      val toClose: Socket? =
        connection.withLock {
          // Sets this.connection to null.
          releaseConnectionNoEvents()
        }
      if (this.connection == null) {
        toClose?.closeQuietly()
        eventListener.connectionReleased(this, connection)

      apply {
        this.message = message
      }

    open fun handshake(handshake: Handshake?) =
      apply {
        this.handshake = handshake
      }

    /**
     * Sets the header named [name] to [value]. If this request already has any headers
     * with that name, they are all replaced.
     */
    open fun header(
      name: String,
      value: String,
    ) = apply {

                }));
    }

    /**
     * Sets the user check interval.
     *
     * @param userCheckInterval The user check interval.
     */
    public void setUserCheckInterval(final long userCheckInterval) {
        this.userCheckInterval = userCheckInterval;
    }

    /**
     * Sets the user information cache size.
     *

    }

    // this optimizes testing equality of two range-backed sets
    if (values instanceof SortedSet) {
      SortedSet<? extends C> set = (SortedSet<? extends C>) values;
      Comparator<?> comparator = set.comparator();
      if (Ordering.natural().equals(comparator) || comparator == null) {
        return contains(set.first()) && contains(set.last());
      }
    }

    for (C value : values) {

  }

  @VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override

  }

  @VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override

    public void delete(final RequestHeader requestHeader) {

        requestHeaderBhv.delete(requestHeader, op -> {
            op.setRefreshPolicy(Constants.TRUE);
        });

    }

    /**
     * Sets up the database query conditions for retrieving request headers based on pager criteria.
     *
     * @param cb the condition bean for building the database query

    } while (index != startingIndex);
    return false;
  }

  @Override
  void setBits(BitSet table) {
    if (containsZero) {
      table.set(0);
    }
    for (char c : this.table) {
      if (c != 0) {
        table.set(c);
      }
    }
  }

    Set<String> keys = bimap.keySet();
    assertEquals(newHashSet("one", "two", "three", "four"), keys);
    assertThat(keys).containsExactly("one", "two", "three", "four").inOrder();
  }

  public void testValues() {
    ImmutableBiMap<String, Integer> bimap =
        ImmutableBiMap.copyOf(ImmutableMap.of("one", 1, "two", 2, "three", 3, "four", 4));
    Set<Integer> values = bimap.values();

          }
          return true;
        }
      }
    }
    return false;
  }

  // Views

  @Override
  Set<E> createElementSet() {
    Set<E> delegate = countMap.keySet();
    return new ForwardingSet<E>() {
      @Override
      protected Set<E> delegate() {
        return delegate;
      }

      @Override
      public boolean contains(@Nullable Object object) {