def prepare_meas(self, params):
""" Set the measurement group parameters
"""
synchronization = params["synchronization"]
codec = CodecFactory().getCodec('json')
data = codec.encode(('', synchronization))
self.meas.write_attribute('synchronization', data[1])
def prepare_meas(self, params):
""" Set the measurement group parameters
"""
synchronization = params["synchronization"]
codec = CodecFactory().getCodec('json')
data = codec.encode(('', synchronization))
self.meas.write_attribute('synchronization', data[1])
class TangoAttributeListener(AttributeListener):
def __init__(self, data_key="value"):
AttributeListener.__init__(self)
codec_name = getattr(sardanacustomsettings, "VALUE_BUFFER_CODEC")
self._codec = CodecFactory().getCodec(codec_name)
self._data_key = data_key
def push_event(self, *args, **kwargs):
self.event_received(*args, **kwargs)
def event_received(self, *args, **kwargs):
try:
event = args[0]
if event.err:
for err in event.errors:
if err.reason == 'UnsupportedFeature':
# when subscribing for events, Tango does one
# readout of the attribute. However the Data
# attribute is not fereseen for readout, it is
# just the event communication channel.
# Ignoring this exception..
return
else:
raise err
_, _value = self._codec.decode(event.attr_value.value)
value = _value.get("value") or _value.get("value_ref")
idx = _value['index']
dev = event.device
obj_fullname = _get_full_name(dev)
# filling the measurement records
with self.data_lock:
channel_data = self.data.get(obj_fullname, [])
expected_idx = len(channel_data)
pad = [None] * (idx[0] - expected_idx)
channel_data.extend(pad + value)
self.data[obj_fullname] = channel_data
except Exception, e:
print e
raise Exception('"data" event callback failed')
def __init__(self, data_key="value"):
AttributeListener.__init__(self)
codec_name = getattr(sardanacustomsettings, "VALUE_BUFFER_CODEC")
self._codec = CodecFactory().getCodec(codec_name)
self._data_key = data_key