def METHOD_NAME(self, slot, subindex, roi, value):
    # Forward to the output
    self.Output[roiToSlice(roi.start, roi.stop)] = value
    entire_roi = roiFromShape(self.Input.meta.shape)
    if (numpy.array((roi.start, roi.stop)) == entire_roi).all():
        # Nothing is dirty any more.
        self._init_fixed_dirty_roi()