log.warn("Session was not properly released");
        }
    }


    /**
     * @return the number of known usages
     */
    protected long getUsageCount () {
        return this.usageCount.get();
    }


    protected abstract long makeKey ( Request request ) throws IOException;


    protected abstract Long peekKey () throws IOException;

    protected synchronized boolean doDisconnect ( boolean hard, boolean inUse ) throws IOException {
        ListIterator<SmbSessionImpl> iter = this.sessions.listIterator();
        boolean wasInUse = false;
        long l = getUsageCount();
        if ( ( inUse && l != 1 ) || ( !inUse && l > 0 ) ) {
            log.warn("Disconnecting transport while still in use " + this + ": " + this.sessions);
            wasInUse = true;
        }