def iter_buffers(self):
buffer_counter = 0
while True:
# determin the part that will be read from disk
start = buffer_counter*len(self.buffer)*self.sub.step + self.sub.start
if start >= self.sub.stop:
break
stop = min(start + len(self.buffer)*self.sub.step, self.sub.stop)
# read the part slice(start, stop, step) from each track and store
# it in the buffer array
log(" %i " % start, False)
first_size = None
for track, column in self._iter_fields():
size = track.read_into(column, slice(start, stop, self.sub.step))
if first_size is None:
first_size = size
elif first_size != size:
raise Error("Not all tracks are of equal length!")
# yield the relevant part of the buffer array
if size == len(self.buffer):
yield self.buffer[:]
else:
yield self.buffer[:size]
break
buffer_counter += 1
log(" %i " % stop, False)
log.finish()
def finish(self):
self._flush_buffer()
log.finish()
