#### Per-Connection Locks

Each connection has its own lock. The connections in the pool are all in a `ConcurrentLinkedQueue`. Due to data races, iterators of this queue may return removed connections. Callers must check the connection's `noNewExchanges` property before using connections from the pool.

The connection lock is never held while doing I/O (even closing a socket) to prevent contention.

  @Override
  public void clear() {
    if (needsAllocArrays()) {
      return;
    }
    this.firstEntry = ENDPOINT;
    this.lastEntry = ENDPOINT;
    // Either both arrays are null or neither is, but we check both to satisfy the nullness checker.
    if (predecessor != null && successor != null) {
      Arrays.fill(predecessor, 0, size(), 0);
      Arrays.fill(successor, 0, size(), 0);
    }
    super.clear();
  }

        }
    }

    /**
     * Checks if a hash algorithm is supported.
     *
     * @param hashAlgorithm the algorithm to check
     * @return true if supported
     */
    public boolean isHashAlgorithmSupported(int hashAlgorithm) {
        return hashAlgorithm == HASH_ALGO_SHA512; // Currently only SHA-512 is supported
    }

    /**

     * @throws ServletException
     */
    @Test
    void testInit() throws ServletException {
        assertDoesNotThrow(() -> ntlmServlet.init(servletConfig));
        // Further assertions can be added here to check the internal state of the servlet if fields were protected/public
    }

    /**
     * Test the init method when CIFSException occurs.

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            return waitingThreads;
          }

          @Override
          @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races
          public Boolean get() {
            // Check that this method is called exactly once, by the first
            // thread to synchronize.
            long t0 = System.nanoTime();
            while (waitingThreads() != numThreads - 1) {

     * @return true if the notification should be delivered
     */
    private boolean shouldDeliverNotification(WitnessRegistration registration, WitnessNotification notification) {
        // Check if notification is relevant to this registration
        String resourceName = notification.getResourceName();
        String shareName = registration.getShareName();

Melden Sie sich bei der Anwendung auf die gleiche Weise wie zuvor an.

Verwenden Sie die Anmeldeinformationen:

Benutzername: `johndoe`
Passwort: `secret`.

/// check

Beachten Sie, dass im Code nirgendwo das Klartext-Passwort "`secret`" steht, wir haben nur die gehashte Version.

///

<img src="/img/tutorial/security/image08.png">

<img src="/img/tutorial/security/image07.png">

Autoriza la aplicación de la misma manera que antes.

Usando las credenciales:

Usuario: `johndoe`
Contraseña: `secret`

/// check | Revisa

Observa que en ninguna parte del código está la contraseña en texto claro "`secret`", solo tenemos la versión con hash.

///

<img src="/img/tutorial/security/image08.png">

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final CrawlerStatsHelper crawlerStatsHelper = ComponentUtil.getCrawlerStatsHelper();
        synchronized (indexUpdateCallback) {
            // required check
            if (!dataMap.containsKey(fessConfig.getIndexFieldUrl()) || dataMap.get(fessConfig.getIndexFieldUrl()) == null) {
                logger.warn("Could not add a doc. Invalid data: {}", dataMap);
                return;