object : EventListener() {
        var socket: SSLSocket? = null
        var closed = false

        override fun connectionAcquired(
          call: Call,
          connection: Connection,
        ) {
          socket = connection.socket() as SSLSocket
        }

        override fun requestHeadersStart(call: Call) {
          if (closed) {
            throw IOException("fake socket failure")
          }
        }

     */
    Metadata read(File input, Map<String, ?> options) throws IOException, MetadataParseException;

    /**
     * Reads the metadata from the specified character reader. The reader will be automatically closed before the method
     * returns.
     *
     * @param input The reader to deserialize the metadata from, must not be {@code null}.

                clientChallenge = null;
            }
            closed = true;
        }
    }

    /**
     * Check if this authenticator has been closed
     *
     * @return true if closed, false otherwise
     */
    public boolean isClosed() {
        return closed;
    }

    private void checkNotClosed() {
        if (closed) {

        } catch (Exception e) {
            return false;
        }
    }

    private void checkNotClosed() {
        if (closed) {
            throw new IllegalStateException("SecureKeyManager is closed");
        }
    }

    // Key rotation configuration
    private long keyRotationIntervalMillis = 3600000L; // 1 hour default

    return getSubMultiset(0, elementSet.headIndex(upperBound, checkNotNull(boundType) == CLOSED));
  }

  @Override
  public ImmutableSortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) {
    return getSubMultiset(
        elementSet.tailIndex(lowerBound, checkNotNull(boundType) == CLOSED), length);
  }

  ImmutableSortedMultiset<E> getSubMultiset(int from, int to) {

     */
    Settings read(File input, Map<String, ?> options) throws IOException, SettingsParseException;

    /**
     * Reads the settings from the specified character reader. The reader will be automatically closed before the method
     * returns.
     *
     * @param input The reader to deserialize the settings from, must not be {@code null}.

     */
    PersistedToolchains read(File input, Map<String, ?> options) throws IOException, ToolchainsParseException;

    /**
     * Reads the toolchains from the specified character reader. The reader will be automatically closed before the
     * method returns.
     *
     * @param input The reader to deserialize the toolchains from, must not be {@code null}.

    def __iter__(self) -> Generator[str, None, None]:
        for item in self.data:
            if self.open:
                yield item
            else:
                raise ValueError("Session closed")


@contextmanager
def acquire_session() -> Generator[Session, None, None]:
    session = Session()
    try:
        yield session
    finally:
        session.open = False

        assertTrue(iterator.hasNext());
        assertSame(resource, iterator.next());
        assertFalse(iterator.hasNext());
        assertNull(iterator.next());

        // Without filter, resource should not be closed
        verify(resource, never()).close();
    }

    @Test
    @DisplayName("Iterator with accepting filter")
    void iteratorWithAcceptingFilter() throws Exception {
        // Setup

    assertThat(sink.getString()).isEqualTo(STRING);
  }

  public void testWriteFromStream_doesNotCloseThatStream() throws IOException {
    TestReader in = new TestReader();
    assertFalse(in.closed());
    sink.writeFrom(in);
    assertFalse(in.closed());
  }

  public void testWriteLines_withSpecificSeparator() throws IOException {
    sink.writeLines(ImmutableList.of("foo", "bar", "baz"), "\n");