Source code for sardana.tango.pool.OneDExpChannel

#!/usr/bin/env python

##############################################################################
##
## This file is part of Sardana
##
## http://www.sardana-controls.org/
##
## Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
## Sardana is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Sardana is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with Sardana.  If not, see <http://www.gnu.org/licenses/>.
##
##############################################################################

""" """

__all__ = ["OneDExpChannel", "OneDExpChannelClass"]

__docformat__ = 'restructuredtext'

import sys
import time

from PyTango import DevFailed, DevVoid, DevString, DevState, AttrQuality, \
    Except, READ, SCALAR

from taurus.core.util.log import DebugIt

from sardana import State, DataFormat, SardanaServer
from sardana.sardanaattribute import SardanaAttribute
from sardana.pool.controller import OneDController, MaxDimSize, Type
from sardana.tango.core.util import to_tango_type_format, exception_str

from sardana.tango.pool.PoolDevice import PoolElementDevice, \
    PoolElementDeviceClass


[docs]class OneDExpChannel(PoolElementDevice): def __init__(self, dclass, name): PoolElementDevice.__init__(self, dclass, name)
[docs] def init(self, name): PoolElementDevice.init(self, name)
[docs] def get_oned(self): return self.element
[docs] def set_oned(self, oned): self.element = oned
oned = property(get_oned, set_oned) @DebugIt()
[docs] def delete_device(self): PoolElementDevice.delete_device(self) oned = self.oned if oned is not None: oned.remove_listener(self.on_oned_changed)
@DebugIt()
[docs] def init_device(self): PoolElementDevice.init_device(self) oned = self.oned if oned is None: full_name = self.get_full_name() name = self.alias or full_name self.oned = oned = \ self.pool.create_element(type="OneDExpChannel", name=name, full_name=full_name, id=self.Id, axis=self.Axis, ctrl_id=self.Ctrl_id) if self.instrument is not None: oned.set_instrument(self.instrument) oned.add_listener(self.on_oned_changed) ## force a state read to initialize the state attribute #state = ct.state self.set_state(DevState.ON)
[docs] def on_oned_changed(self, event_source, event_type, event_value): try: self._on_oned_changed(event_source, event_type, event_value) except not DevFailed: msg = 'Error occurred "on_oned_changed(%s.%s): %s"' exc_info = sys.exc_info() self.error(msg, self.motor.name, event_type.name, exception_str(*exc_info[:2])) self.debug("Details", exc_info=exc_info)
def _on_oned_changed(self, event_source, event_type, event_value): # during server startup and shutdown avoid processing element # creation events if SardanaServer.server_state != State.Running: return timestamp = time.time() name = event_type.name.lower() try: attr = self.get_attribute_by_name(name) except DevFailed: return quality = AttrQuality.ATTR_VALID priority = event_type.priority value, w_value, error = None, None, None if name == "state": value = self.calculate_tango_state(event_value) elif name == "status": value = self.calculate_tango_status(event_value) else: if isinstance(event_value, SardanaAttribute): if event_value.error: error = Except.to_dev_failed(*event_value.exc_info) else: value = event_value.value timestamp = event_value.timestamp if name == "value": state = self.oned.get_state() if state == State.Moving: quality = AttrQuality.ATTR_CHANGING self.set_attribute(attr, value=value, w_value=w_value, timestamp=timestamp, quality=quality, priority=priority, error=error, synch=False)
[docs] def always_executed_hook(self): #state = to_tango_state(self.oned.get_state(cache=False)) pass
[docs] def read_attr_hardware(self, data): pass
[docs] def get_dynamic_attributes(self): cache_built = hasattr(self, "_dynamic_attributes_cache") std_attrs, dyn_attrs = \ PoolElementDevice.get_dynamic_attributes(self) if not cache_built: # For value attribute, listen to what the controller says for data # type (between long and float) and length value = std_attrs.get('value') if value is not None: _, data_info, attr_info = value ttype, _ = to_tango_type_format(attr_info.dtype) data_info[0][0] = ttype shape = attr_info.maxdimsize data_info[0][3] = shape[0] return std_attrs, dyn_attrs
[docs] def read_Value(self, attr): oned = self.oned use_cache = oned.is_in_operation() and not self.Force_HW_Read value = oned.get_value(cache=use_cache, propagate=0) if value.error: Except.throw_python_exception(*value.exc_info) state = oned.get_state(cache=use_cache, propagate=0) quality = None if state == State.Moving: quality = AttrQuality.ATTR_CHANGING self.set_attribute(attr, value=value.value, quality=quality, timestamp=value.timestamp, priority=0)
[docs] def is_Value_allowed(self, req_type): if self.get_state() in [DevState.FAULT, DevState.UNKNOWN]: return False return True
[docs] def read_DataSource(self, attr): data_source = self.oned.get_data_source() if data_source is None: data_source = "tango://{0}/value".format(self.get_full_name()) attr.set_value(data_source)
[docs] def Start(self): self.oned.start_acquisition()
_DFT_VALUE_INFO = OneDController.standard_axis_attributes['Value'] _DFT_VALUE_MAX_SHAPE = _DFT_VALUE_INFO[MaxDimSize] _DFT_VALUE_TYPE, _DFT_VALUE_FORMAT = to_tango_type_format(_DFT_VALUE_INFO[Type], DataFormat.OneD)
[docs]class OneDExpChannelClass(PoolElementDeviceClass): # Class Properties class_property_list = { } # Device Properties device_property_list = { } device_property_list.update(PoolElementDeviceClass.device_property_list) # Command definitions cmd_list = { 'Start' : [ [DevVoid, ""], [DevVoid, ""] ], } cmd_list.update(PoolElementDeviceClass.cmd_list) # Attribute definitions attr_list = { 'DataSource' : [ [ DevString, SCALAR, READ ] ], } attr_list.update(PoolElementDeviceClass.attr_list) standard_attr_list = { 'Value' : [ [ _DFT_VALUE_TYPE, _DFT_VALUE_FORMAT, READ, _DFT_VALUE_MAX_SHAPE[0] ], { 'abs_change' : '1.0', } ], } standard_attr_list.update(PoolElementDeviceClass.standard_attr_list) def _get_class_properties(self): ret = PoolElementDeviceClass._get_class_properties(self) ret['Description'] = "1D device class" ret['InheritedFrom'].insert(0, 'PoolElementDevice') return ret