public void release() {
        final long usage = this.usageCount.decrementAndGet();
        if (log.isTraceEnabled()) {
            log.trace("Release transport " + usage + " " + this);
        }

        if (usage == 0) {
            if (log.isTraceEnabled()) {
                log.trace("Transport usage dropped to zero " + this);
            }
        } else if (usage < 0) {

                if (log.isDebugEnabled()) {
                    log.debug("File pointer is at " + this.fp);
                }
            }
            return this.handle;
        }

        log.trace("File already open");
        return this.handle.acquire();
    }

    /**
     * Ensures that the tree connection is established.
     *
     * @return the tree handle

)

// ContextTraceType represents the type of golang Context key
type ContextTraceType string

// ContextTraceKey is the key of TraceCtxt saved in a Golang context
const ContextTraceKey = ContextTraceType("ctx-trace-info")

// TraceCtxt holds related tracing data of a http request.
type TraceCtxt struct {
	RequestRecorder  *xhttp.RequestRecorder
	ResponseRecorder *xhttp.ResponseRecorder

	FuncName string
	AmzReqID string

	scannerMetricCleanAbandoned
	scannerMetricApplyNonCurrent
	scannerMetricHealAbandonedVersion

	// START Trace metrics:
	scannerMetricStartTrace
	scannerMetricScanObject // Scan object. All operations included.
	scannerMetricHealAbandonedObject

	// END realtime metrics:
	scannerMetricLastRealtime

	// Trace only metrics:
	scannerMetricScanFolder      // Scan a folder on disk, recursively.

	connPingInterval   time.Duration
	blockConnect       chan struct{}

	incomingBytes func(n int64) // Record incoming bytes.
	outgoingBytes func(n int64) // Record outgoing bytes.
	trace         *tracer       // tracer for this connection.
	baseFlags     Flags
	outBytes      atomic.Int64
	inBytes       atomic.Int64
	inMessages    atomic.Int64
	outMessages   atomic.Int64
	reconnects    atomic.Int64

        }
        // ensure file is open
        try (SmbFileHandleImpl fd = ensureOpen(); SmbTreeHandleImpl th = fd.getTree()) {

            if (log.isTraceEnabled()) {
                log.trace("read: fid=" + fd + ",off=" + off + ",len=" + len);
            }

            final int type = this.file.getType();
            int r, n;

        //
        // Note that there is a race condition here which can result in missing
        // a cyclic edge: it's possible for two threads to simultaneous find
        // "safe" edges which together form a cycle. Preventing this race
        // condition efficiently without _introducing_ deadlock is probably
        // tricky. For now, just accept the race condition---missing a warning

        dstIndex += 2;
        if (this.digest != null) {
            SMB1SigningDigest.writeUTime(getConfig(), this.lastWriteTime, dst, dstIndex);
        } else {
            log.trace("SmbComClose without a digest");
        }
        return 6;
    }

    @Override
    protected int writeBytesWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override

        final long usage = this.usageCount.decrementAndGet();
        if (usage == 0) {
            closeInternal(0L, false);
        } else if (log.isTraceEnabled()) {
            log.trace(String.format("Release %s (%d)", this, usage));
        }
    }

    /**
     * {@inheritDoc}
     *
     * @see java.lang.Object#finalize()
     */
    @Override

     *
     * @param message the detail message describing the exception
     * @param enableSuppression whether suppression is enabled or disabled
     * @param writableStackTrace whether the stack trace should be writable
     */
    protected FessSystemException(final String message, final boolean enableSuppression, final boolean writableStackTrace) {
        super(message, null, enableSuppression, writableStackTrace);
    }