#!/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__ = ["CTExpChannel", "CTExpChannelClass"]
__docformat__ = 'restructuredtext'
import sys
import time
from PyTango import DevFailed, DevVoid, DevDouble, DevState, AttrQuality, \
DevString, Except, READ, SCALAR, READ_WRITE
from taurus.core.util.log import DebugIt
from sardana import State, SardanaServer
from sardana.sardanaattribute import SardanaAttribute
from sardana.tango.core.util import to_tango_type_format, to_tango_quality, \
exception_str
from sardana.tango.pool.PoolDevice import PoolTimerableDevice, \
PoolTimerableDeviceClass
[docs]class CTExpChannel(PoolTimerableDevice):
def __init__(self, dclass, name):
PoolTimerableDevice.__init__(self, dclass, name)
self._first_read_cache = False
[docs] def init(self, name):
PoolTimerableDevice.init(self, name)
[docs] def get_ct(self):
return self.element
[docs] def set_ct(self, ct):
self.element = ct
ct = property(get_ct, set_ct)
[docs] @DebugIt()
def delete_device(self):
PoolTimerableDevice.delete_device(self)
ct = self.ct
if ct is not None:
ct.remove_listener(self.on_ct_changed)
self.ct = None
[docs] @DebugIt()
def init_device(self):
PoolTimerableDevice.init_device(self)
id_ = self.get_id()
try:
self.ct = ct = self.pool.get_element_by_id(id_)
except KeyError:
full_name = self.get_full_name()
name = self.alias or full_name
self.ct = ct = \
self.pool.create_element(type="CTExpChannel",
name=name, full_name=full_name, id=id_, axis=self.Axis,
ctrl_id=self.get_ctrl_id())
if self.instrument is not None:
ct.set_instrument(self.instrument)
ct.add_listener(self.on_ct_changed)
# force a state read to initialize the state attribute
#state = ct.state
self.set_state(DevState.ON)
[docs] def on_ct_changed(self, event_source, event_type, event_value):
try:
self._on_ct_changed(event_source, event_type, event_value)
except DevFailed:
raise
except:
msg = 'Error occurred "on_ct_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_ct_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()
name = name.replace('_', '') # for integration_time events
attr_name = name
try:
attr = self.get_attribute_by_name(attr_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)
elif name == "valuebuffer":
value = self._encode_value_chunk(event_value)
self._first_read_cache = True
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
else:
value = event_value
if name == "timer" and value is None:
value = "None"
elif name == "value":
value_attr = event_source.get_value_attribute()
w_value = value_attr.w_value
quality = to_tango_quality(value_attr.quality)
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.ct.get_state(cache=False))
pass
def read_attr_hardware(self, data):
pass
[docs] def get_dynamic_attributes(self):
cache_built = hasattr(self, "_dynamic_attributes_cache")
std_attrs, dyn_attrs = \
PoolTimerableDevice.get_dynamic_attributes(self)
if not cache_built:
# For value attribute, listen to what the controller says for data
# type (between long and float)
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
return std_attrs, dyn_attrs
[docs] def initialize_dynamic_attributes(self):
attrs = PoolTimerableDevice.initialize_dynamic_attributes(self)
detect_evts = "value",
non_detect_evts = "valuebuffer",
for attr_name in detect_evts:
if attr_name in attrs:
self.set_change_event(attr_name, True, True)
for attr_name in non_detect_evts:
if attr_name in attrs:
self.set_change_event(attr_name, True, False)
[docs] def read_Value(self, attr):
ct = self.ct
# TODO: decide if we force the controller developers to store the
# last acquired value in the controllers or we always will use
# cache. This is due to the fact that the clients (MS) read the value
# after the acquisition had finished.
use_cache = ct.is_in_operation() and not self.Force_HW_Read
# For the moment we just check if we recently receive ValueBuffer.
# event. In this case, we use cache and clean the flag
# so the cached value will be returned only at the first readout
# after the acquisition. This is a workaround for the count executed
# by the MacroServer e.g. step scans or ct which read the value after
# the acquisition.
if not use_cache and self._first_read_cache:
use_cache = True
self._first_read_cache = False
value = ct.get_value(cache=use_cache, propagate=0)
if value.error:
Except.throw_python_exception(*value.exc_info)
state = ct.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 Start(self):
self.ct.start_acquisition()
[docs]class CTExpChannelClass(PoolTimerableDeviceClass):
# Class Properties
class_property_list = {}
# Device Properties
device_property_list = {}
device_property_list.update(PoolTimerableDeviceClass.device_property_list)
# Command definitions
cmd_list = {
'Start': [[DevVoid, ""], [DevVoid, ""]],
}
cmd_list.update(PoolTimerableDeviceClass.cmd_list)
# Attribute definitions
attr_list = {}
attr_list.update(PoolTimerableDeviceClass.attr_list)
standard_attr_list = {
'Value': [[DevDouble, SCALAR, READ],
{'abs_change': '1.0', }]
}
standard_attr_list.update(PoolTimerableDeviceClass.standard_attr_list)
def _get_class_properties(self):
ret = PoolTimerableDeviceClass._get_class_properties(self)
ret['Description'] = "Counter/Timer device class"
ret['InheritedFrom'].insert(0, 'PoolTimerableDevice')
return ret