// Test implementation
        }
    }

    // ========== Thread Safety Tests for getDataStoreNames() ==========

    /**
     * Test concurrent getDataStoreNames calls to verify synchronized method works correctly.
     * Multiple threads call getDataStoreNames() simultaneously.
     */
    @Test
    public void test_getDataStoreNames_concurrentAccess() throws Exception {

        handle.sendrecv(rpc);
        if (rpc.retval != 0) {
            throw new SmbException(rpc.retval, false);
        }
        this.opened = true;
    }

    @Override
    public synchronized void close() throws IOException {
        if (this.opened) {
            this.opened = false;
            final MsrpcSamrCloseHandle rpc = new MsrpcSamrCloseHandle(this);
            this.handle.sendrecv(rpc);

      return false;
    }
  }

  private static final class RecordingRunnable implements Runnable {
    final CountDownLatch wasRun = new CountDownLatch(1);

    // synchronized so that checkState works as expected.
    @Override
    public synchronized void run() {
      checkState(wasRun.getCount() > 0);
      wasRun.countDown();
    }
  }

     * @see jcifs.SmbPipeHandle#isStale()
     */
    @Override
    public boolean isStale() {
        return !this.open || this.handle != null && !this.handle.isValid();
    }

    @Override
    public synchronized SmbFileHandleImpl ensureOpen() throws CIFSException {
        if (!this.open) {
            throw new SmbException("Pipe handle already closed");
        }

        if (!isOpen()) {

            throw new SQLRuntimeException(e);
        }
    }

    /**
     * Deregisters all JDBC drivers associated with the current class loader.
     */
    public static synchronized void deregisterAllDrivers() {
        for (final Enumeration<Driver> e = DriverManager.getDrivers(); e.hasMoreElements();) {
            deregisterDriver(e.nextElement());
        }
    }

import java.io.OutputStream;

class SocketOutputStream extends FilterOutputStream {

    SocketOutputStream(final OutputStream out) {
        super(out);
    }

    @Override
    public synchronized void write(final byte[] b, int off, final int len) throws IOException {
        if (len > 0xFFFF) {
            throw new IOException("write too large: " + len);
        }
        if (off < 4) {

import org.jspecify.annotations.Nullable;

/**
 * Tests for {@link Synchronized#queue} and {@link Queues#synchronizedQueue}.
 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
public class SynchronizedQueueTest extends TestCase {

  protected Queue<String> create() {
    TestQueue<String> inner = new TestQueue<>();
    Queue<String> outer = Synchronized.queue(inner, inner.mutex);

      delegate.clear();
    }

    @Override
    public Collection<V> values() {
      assertTrue(Thread.holdsLock(mutex));
      /* TODO: verify that the Collection is also synchronized? */
      return delegate.values();
    }

    @Override
    public Set<Cell<R, C, V>> cellSet() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.cellSet();
    }

    @Override

    protected CrawlerClientFactory crawlerClientFactory;

    /**
     * List of URLs to be deleted, cached for batch processing.
     * All access is synchronized via indexUpdateCallback lock.
     */
    protected List<String> deleteUrlList = new ArrayList<>();

    /** Maximum size of the delete URL cache before batch deletion is triggered. */

     * This prevents stack trace generation for this exception type.
     *
     * @return null to skip stack trace generation
     */
    @Override
    public synchronized Throwable fillInStackTrace() {
        return null;
    }