(self, upstream)
Add upstream to current upstreams, this method is overridden for
        classes which handle stream specific buffers/caches
Add upstream to current upstreams, this method is overridden for
        classes which handle stream specific buffers/caches
Add upstream to current upstreams this method is overridden for classes which handle stream specific buffers / caches
def _add_upstream(self, upstream):
        """Add upstream to current upstreams, this method is overridden for
        classes which handle stream specific buffers/caches"""
        self.upstreams.append(upstream)
def _add_upstream ( self , upstream ) : self . upstreams . append ( upstream )