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#!/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/>.
##
##############################################################################
"""This module is part of the Python Pool libray. It defines the base classes
for external objects to the pool (like tango objects)"""
__all__ = ["PoolBaseExternalObject", "PoolTangoObject", "PoolExternalObject"]
__docformat__ = 'restructuredtext'
import PyTango
from sardana import ElementType
from sardana.pool.poolbaseobject import PoolBaseObject
class PoolBaseExternalObject(PoolBaseObject):
"""TODO"""
def __init__(self, **kwargs):
kwargs['elem_type'] = ElementType.External
PoolBaseObject.__init__(self, **kwargs)
def get_source(self):
return self.full_name
def get_config(self):
raise NotImplementedError
class PoolTangoObject(PoolBaseExternalObject):
"""TODO"""
def __init__(self, **kwargs):
scheme = kwargs.pop('scheme', 'tango')
attribute_name = kwargs.pop('attributename')
host, port = kwargs.pop('host', None), kwargs.pop('port', None)
devalias = kwargs.pop('devalias', None)
device_name = kwargs.pop('devicename', None)
if host is None:
db = PyTango.Database()
host, port = db.get_db_host(), db.get_db_port()
else:
db = PyTango.Database(host, port)
full_name = "<unknown>"
if device_name is None:
if devalias is not None:
try:
device_name = db.get_device_alias(devalias)
full_name = "{0}:{1}/{2}/{3}".format(host, port,
device_name,
attribute_name)
except:
full_name = "{0}/{1}".format(devalias, attribute_name)
else:
full_name = "{0}:{1}/{2}/{3}".format(host, port, device_name,
attribute_name)
self._device_name = device_name
self._attribute_name = attribute_name
self._config = None
self._device = None
kwargs['name'] = attribute_name
kwargs['full_name'] = full_name
PoolBaseExternalObject.__init__(self, **kwargs)
def get_device_name(self):
return self._device_name
def get_attribute_name(self):
return self._attribute_name
def get_device(self):
device = self._device
if device is None:
try:
self._device = device = PyTango.DeviceProxy(self._device_name)
except:
pass
return device
def get_config(self):
config = self._config
if config is None:
try:
self._config = config = \
self._device.get_attribute_config(self._attribute_name)
except:
pass
return config
device_name = property(get_device_name)
attribute_name = property(get_attribute_name)
_SCHEME_CLASS = { 'tango' : PoolTangoObject,
None : PoolTangoObject}
def PoolExternalObject(**kwargs):
scheme = kwargs.get('scheme', 'tango')
klass = _SCHEME_CLASS[scheme]
return klass(**kwargs)
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