rwl.writeLock().unlock();
if (log.isDebugEnabled()) log.debug("lookupPixels for id "+pixelsId+" succeeded: "+this.pixelsObj);
    public void lookupPixels(long pixelsId)    {        rwl.writeLock().lock();        {            this.pixelsObj = pixMetaSrv.retrievePixDescription(pixelsId);            this.renderer = null;        }        rwl.writeLock().unlock();    }