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#!/usr/bin/env python
#############################################################################
##
## This file is part of Taurus
##
## http://taurus-scada.org
##
## Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
## Taurus 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.
##
## Taurus 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 Taurus. If not, see <http://www.gnu.org/licenses/>.
##
#############################################################################
'''
Examples on using the evaluation scheme for exposing arbitrary non-tango quantities as taurus attributes
'''
__all__ = ['IcepapDriverParam']
from taurus.core.evaluation import EvaluationDevice
import re
import pyIcePAP
class IcepapDriverParam(EvaluationDevice):
'''A simple example of usage of the evaluation scheme for
creating an icepap connection device to obtain icepap driver values.
Important: note that only those members listed in `_symbols` will be available
'''
_symbols = ['getAxisParam']
def __init__(self, *args, **kwargs):
''' Get from Database info the icepap host and port to connect. '''
self.call__init__(EvaluationDevice, *args, **kwargs)
# Get the icepap host and port to connect
self.ipap = None
try:
db_name = self.getNameValidator().getDBName(self._full_name)
db_name = db_name.replace('eval://','')
db_name = db_name.replace('db=','')
host,port = db_name.split(':')
self.ipap = pyIcePAP.EthIcePAP(host, port)
self.ipap.connect()
except:
pass
def getAxisParam(self, axis, param):
''' return the axis parameter value. '''
if self.ipap is None or not self.ipap.connected:
raise Exception('Not a valid icepap connection')
try:
value = self.ipap.readParameter(axis, param)
return float(value)
except:
return value
#===============================================================================
# Just for testing
#===============================================================================
ATTR_IPAP_POS = 'eval://db=icepap06:5000;dev=taurus.core.evaluation.ipap_example.IcepapDriverParam;getAxisParam(1,"POS")'
def test1():
import taurus.core
a = taurus.Attribute(ATTR_IPAP_POS)
print "axis pos:", a.read().value
def test2():
import sys
from taurus.qt.qtgui.application import TaurusApplication
from taurus.qt.qtgui.display import TaurusLabel
app = TaurusApplication()
tl = TaurusLabel()
tl.setModel(ATTR_IPAP_POS)
tl.show()
sys.exit(app.exec_())
if __name__ == "__main__":
test1()
test2()
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