advance();
  }

  @Override
  public void close() throws IOException {
    if (in != null) {
      try {
        in.close();
      } finally {
        in = null;
      }
    }
  }

  /** Closes the current input stream and opens the next one, if any. */
  private void advance() throws IOException {
    close();
    if (it.hasNext()) {
      in = it.next().openStream();
    }
  }

  @Override

	// * an error on failure of unlock request operation.
	ForceUnlock(ctx context.Context, args LockArgs) (bool, error)

	// Returns underlying endpoint of this lock client instance.
	String() string

	// Close closes any underlying connection to the service endpoint
	Close() error

	// Is the underlying connection online? (is always true for any local lockers)
	IsOnline() bool

	// Is the underlying locker local to this server?

  private final Iterator<? extends CharSource> it;
  private @Nullable Reader current;

  MultiReader(Iterator<? extends CharSource> readers) throws IOException {
    this.it = readers;
    advance();
  }

  /** Closes the current reader and opens the next one, if any. */
  private void advance() throws IOException {
    close();
    if (it.hasNext()) {
      current = it.next().openStream();
    }
  }

  @Override

        doReturn(fh).when(raf).ensureOpen();

        // Act
        raf.open();

        // Assert: open() ensures handle and closes it via try-with-resources
        verify(raf, times(1)).ensureOpen();
        verify(fh, times(1)).close();
    }

    @Test
    @DisplayName("close(): clears cache and closes handle; does not close shared SmbFile")
    void close_sharedFile_closesHandle_only() throws Exception {

package http

import (
	"context"
	"net"
	"syscall"
	"time"
)

// CheckPortAvailability - check if given host and port is already in use.
// Note: The check method tries to listen on given port and closes it.
// It is possible to have a disconnected client in this tiny window of time.
func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
	lc := &net.ListenConfig{

     */
    public void recordConnectionCreated() {
        connectionsCreated.incrementAndGet();
        connectionsActive.incrementAndGet();
    }

    /**
     * Record RDMA connection closure
     */
    public void recordConnectionClosed() {
        connectionsActive.decrementAndGet();
    }

    /**
     * Record memory region allocation
     */

  when {
    this.isNullOrEmpty() -> emptyList()
    this.size == 1 -> Collections.singletonList(this[0])
    else -> this.clone().asList().unmodifiable()
  }

/** Closes this, ignoring any checked exceptions. */
internal fun Socket.closeQuietly() {
  try {
    close()
  } catch (e: AssertionError) {
    throw e
  } catch (rethrown: RuntimeException) {

    private static final Logger logger = Logger.getLogger(ResultSetUtil.class);

    /**
     * Do not instantiate.
     */
    protected ResultSetUtil() {
    }

    /**
     * Closes the result set.
     * <p>
     * If {@link ResultSet#close()} throws an exception, an error message is logged. The exception is not rethrown.
     * </p>
     *
     * @param resultSet
     *            The result set

     * @throws InvokerException if an error occurs during the invocation process.
     */
    int invoke(@Nonnull InvokerRequest invokerRequest) throws InvokerException;

    /**
     * Closes and disposes of this {@link Invoker} instance, releasing any resources it may hold.
     * This method is called automatically when using try-with-resources statements.
     *

        assertEquals(wildcard, it.getWildcard());
        assertSame(parent, it.getParent());
        verify(tree, times(1)).acquire();
    }

    @Test
    @DisplayName("Constructor with open() returning null closes immediately and hasNext=false")
    void constructorOpenNullCloses() throws Exception {
        // Arrange
        stubAcquireReturnsSelf();
        List<FileEntry[]> pages = List.of(new FileEntry[][] { new FileEntry[] {} });