* <li><code>CreateFile</code>, <code>ReadFile</code>,
 * <code>WriteFile</code>, and <code>CloseFile</code> A byte-type pipe can
 * be opened, written to, read from and closed using the standard Win32
 * file operations.
 * </ul>
 *
 * <p>
 * The jCIFS API maps all of these operations into the standard Java
 * <code>XxxputStream</code> interface. A special <code>PIPE_TYPE</code>

<img src="/img/tutorial/websockets/image05.png">

## Handling disconnections and multiple clients { #handling-disconnections-and-multiple-clients }

When a WebSocket connection is closed, the `await websocket.receive_text()` will raise a `WebSocketDisconnect` exception, which you can then catch and handle like in this example.

{* ../../docs_src/websockets/tutorial003_py39.py hl[79:81] *}

To try it out:

   *
   * If the call's connection exists and is eligible for another exchange, it is returned. If it
   * exists but cannot be used for another exchange, it is closed and this returns null.
   */
  private fun planReuseCallConnection(): ReusePlan? {
    // This may be mutated by releaseConnectionNoEvents()!
    val candidate = connectionUser.candidateConnection() ?: return null

    @Test
    void testDisconnect() throws Exception {
        // Act
        ntlmConnection.disconnect();

        // Assert
        verify(mockConnection).disconnect();
        // Connection should be closed after disconnect
    }

    /**
     * Test simple getter methods that should trigger the handshake.
     * We mock a simple 200 OK response to test the handshake is called.
     * @throws IOException
     */

  internal var writeSuccessCount = 0
  internal var writeAbortCount = 0
  private var networkCount = 0
  private var hitCount = 0
  private var requestCount = 0

  val isClosed: Boolean
    get() = cache.isClosed()

  internal fun get(request: Request): Response? {
    val key = key(request.url)
    val snapshot: DiskLruCache.Snapshot =
      try {
        cache[key] ?: return null

	}
	// Cache the Stmt object with the associated key.
	s.Set(key, cacheStmt)
	// Unlock after completing initialization to prevent deadlocks.
	locker.Unlock()

	// Ensure the prepared channel is closed after the function execution completes.
	defer close(cacheStmt.prepared)

	// Prepare the SQL statement using the provided connection.
	cacheStmt.Stmt, err = conn.PrepareContext(ctx, key)
	if err != nil {

   * CharStreams} method returns a singleton writer whose {@code close} method has no effect, while
   * the {@link Writer#nullWriter()} method returns a new instance whose methods throw after the
   * instance is {@link Writer#close() closed}.
   *
   * @since 15.0
   */
  public static Writer nullWriter() {
    return NullWriter.INSTANCE;
  }

  private static final class NullWriter extends Writer {

		cacheStore:       cacheStore,
		namer:            namer,
		initialized:      make(chan struct{}),
	}
	// When the schema initialization is completed, the channel will be closed
	defer close(schema.initialized)

	// Load exist schema cache, return if exists
	if v, ok := cacheStore.Load(schemaCacheKey); ok {
		s := v.(*Schema)
		// Wait for the initialization of other goroutines to complete

                for (i in 0..9) {
                  sink.writeByte(0)
                  sink.flush()
                  sleep(100)
                }
                fail("Expected connection to be closed")
              }
            },
        ),
      )
    cancelLater(call, 500)
    assertFailsWith<IOException> {
      call.execute()
    }.also { expected ->

    @Override
    protected void finalize() throws Throwable {
        try {
            if (this.usageCount != null && this.usageCount.get() != 0 && this.open) {
                log.warn("File handle was not properly closed, performing emergency cleanup: " + this);
                if (this.creationBacktrace != null) {
                    log.warn(Arrays.toString(this.creationBacktrace));
                }
                emergencyCloseHandle();