c = 2 * cap(b)
	}
	b2 := append([]byte(nil), make([]byte, c)...)
	i := copy(b2, b)
	return b2[:i]
}

// WriteTo writes data to w until the buffer is drained or an error occurs.
// The return value n is the number of bytes written; it always fits into an
// int, but it is int64 to match the [io.WriterTo] interface. Any error
// encountered during the write is also returned.

            try {
                return func.apply(this).actionGet(connTimeout, TimeUnit.MILLISECONDS);
            } catch (final IndexNotFoundException | VersionConflictEngineException e) {
                logger.debug("{} occurs.", e.getClass().getName(), e);
                throw e;
            } catch (final Exception e) {
                if (retryCount >= maxRetryCount) {
                    throw e;
                }

     * @return the redirect URL if a redirect occurred, null otherwise
     * @throws ChildUrlsException if child URLs are discovered during processing
     * @throws DataStoreCrawlingException if an error occurs during crawling
     */
    protected String processRequest(final DataStoreParams paramMap, final Map<String, Object> dataMap, final String url,
            final CrawlerClient client) {

        };
    }

    /**
     * Returns the signing key for SMB signing.
     *
     * @param challenge the server challenge bytes
     * @return the signing key
     * @throws SmbException if an error occurs generating the signing key
     */
    public byte[] getSigningKey(final byte[] challenge) throws SmbException {
        switch (LM_COMPATIBILITY) {
        case 0:
        case 1:
        case 2:

     * @throws EmptyArgumentException
     *             If the class name is {@literal null} or empty.
     * @throws ClassNotFoundRuntimeException
     *             If a {@link ClassNotFoundException} occurs.
     * @see #forName(String)
     */
    public static Class<?> convertClass(final String className) throws ClassNotFoundRuntimeException {
        assertArgumentNotEmpty("className", className);

 *
 * <p><strong>Cycle Detection</strong>
 *
 * <p>Deadlocks can arise when locks are acquired in an order that forms a cycle. In a simple
 * example involving two locks and two threads, deadlock occurs when one thread acquires Lock A, and
 * then Lock B, while another thread acquires Lock B, and then Lock A:
 *
 * <pre>
 * Thread1: acquire(LockA) --X acquire(LockB)
 * Thread2: acquire(LockB) --X acquire(LockA)
 * </pre>

        }
    }

    /**
     * Internal method to send a request to the server.
     *
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected void doSend0(final Request request) throws IOException {
        try {
            doSend(request);
        } catch (final IOException ioe) {
            if (LogStream.level > 2) {

}

// Transaction start a transaction as a block, return error will rollback, otherwise to commit. Transaction executes an
// arbitrary number of commands in fc within a transaction. On success the changes are committed; if an error occurs
// they are rolled back.
func (db *DB) Transaction(fc func(tx *DB) error, opts ...*sql.TxOptions) (err error) {
	panicked := true

	if committer, ok := db.Statement.ConnPool.(TxCommitter); ok && committer != nil {

			readBytes, _ := buf.Read(tmp)
			yBytes := Repeat(y, growLen)
			allocs := testing.AllocsPerRun(100, func() {
				buf.Grow(growLen)
				buf.Write(yBytes)
			})
			// Check no allocation occurs in write, as long as we're single-threaded.
			if allocs != 0 {
				t.Errorf("allocation occurred during write")
			}
			// Check that buffer has correct data.

	f.formatOctal(v7.gid(), 0)
	f.formatOctal(v7.size(), int64(len(data))) // Must be < 8GiB
	f.formatOctal(v7.modTime(), 0)
	tw.blk.setFormat(format)
	if f.err != nil {
		return f.err // Only occurs if size condition is violated
	}

	// Write the header and data.
	if err := tw.writeRawHeader(&tw.blk, int64(len(data)), flag); err != nil {
		return err
	}
	_, err := io.WriteString(tw, data)
	return err