def _make_update_task(self, uda_class, cols, prior_state=None):
# Overall layout here:
# - task name
# - serialized agg class
# - prior state flag 1/0
# - (optional) serialized prior state
# - serialized table fragment
payload = BytesIO()
msg_writer = wire.PackedMessageWriter(payload)
msg_writer.string('agg-update')
msg_writer.string(compat.pickle_dump(uda_class))
if prior_state is not None:
msg_writer.uint8(1)
msg_writer.string(compat.pickle_dump(prior_state))
else:
msg_writer.uint8(0)
writer = IbisTableWriter(cols)
# Create memory map of the appropriate size
path = 'task_%s' % guid()
size = writer.total_size() + payload.tell()
offset = 0
mm = SharedMmap(path, size, create=True)
self.paths_to_delete.append(path)
mm.write(payload.getvalue())
writer.write(mm)
task = IbisTaskMessage(self.lock.semaphore_id, path, offset, size)
return task, mm
def _make_update_task(self, uda_class, cols, prior_state=None):
# Overall layout here:
# - task name
# - serialized agg class
# - prior state flag 1/0
# - (optional) serialized prior state
# - serialized table fragment
payload = BytesIO()
msg_writer = wire.PackedMessageWriter(payload)
msg_writer.string('agg-update')
msg_writer.string(compat.pickle_dump(uda_class))
if prior_state is not None:
msg_writer.uint8(1)
msg_writer.string(compat.pickle_dump(prior_state))
else:
msg_writer.uint8(0)
writer = IbisTableWriter(cols)
# Create memory map of the appropriate size
path = 'task_%s' % guid()
size = writer.total_size() + payload.tell()
offset = 0
mm = SharedMmap(path, size, create=True)
self.paths_to_delete.append(path)
mm.write(payload.getvalue())
writer.write(mm)
task = IbisTaskMessage(self.lock.semaphore_id, path, offset, size)
return task, mm
def _write_response(self, agg_inst):
self.shmem.seek(0)
self.mark_success()
serialized_inst = compat.pickle_dump(agg_inst)
wire.write_string(self.shmem, serialized_inst)