Memorized Attributes

[Christophe Chappet]

Hi Tangoers,

I try to set the memorized option on an attribut using W7 - Python 2.7.11 - PyTango 8.1.6

The declaration of the attribut is :

                                'freeze' : [ [        PyTango.ArgType.DevBoolean,
                                                        PyTango.AttrDataFormat.SCALAR,
                                                        PyTango.AttrWriteType.READ_WRITE],

but when I try this :

        MAttr = self.get_device_attr()
        attr = MAttr.get_attr_by_name("freeze")
        attr.set_memorized(True)

I get that :

-------> Received a DevFailed exception: DevFailed[
DevError[
    desc = AttributeError: 'WAttribute' object has no attribute 'set_memorized'
          
  origin =   File "C:\Python\lib\site-packages\PyTango\device_class.py", line 518, in __DeviceClass__device_factory
    device = self._new_device(deviceImplClass, klass, dev_name)
  File "C:\Python\lib\site-packages\PyTango\device_class.py", line 498, in __DeviceClass__new_device
    return klass(dev_class, dev_name)
  File "D:\cchappet\git\PyGMT\src\PyGMT\GMTTango\devices\Survbal\SurvbalManagerImpl.py", line 30, in __init__
    attr.set_memorized(True)

what am I doing wrong ?
Cheers,
Christophe

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[Nexeya TANGO Team]

Hi,

 

I think you have to try :

 

attr.set_memorized()

attr.set_memorized_init(False or True) // reload the value in db

 

Sébastien GARA

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De : Christophe Chappet [mailto:Christoph...@onera.fr]
Envoyé : mercredi 29 juin 2016 08:57
À : ta...@esrf.fr
Objet : Memorized Attributes

[Christophe Chappet]

Hi Sébastien,

I think I have to learn reading documentation :-( , you are right, no parameter for set_memorized()

Nevertheless, it still doesn't work.

Using the attached example, I get :

desc = AttributeError: 'WAttribute' object has no attribute 'set_memorized' with PyTango.AttrWriteType.READ_WRITE

desc = AttributeError: 'Attribute' object has no attribute 'set_memorized' with PyTango.AttrWriteType.READ

That's true, set_memorized is only defined in Attr class.
How can I get a handle on an Attr attribute ?

[Christophe Chappet]

Hi Jairo,

Thanks, it works this way.

Christophe

Le 29/06/2016 à 09:09, jmoldes a écrit :

You can set attribute properties when defining the list of attributes. For 
example:

    attr_list = {
       ...
        'RFDelta':
            [[PyTango.DevDouble,
              PyTango.SCALAR,
              PyTango.READ_WRITE],
             {
                'unit': 'Hz',
                'memorized': 'true'
            }],
       ...
    }

Memorized value can be "true_without_hard_applied" or "true", which correspond 
to the tango cpp versions MEMORIZED and MEMORIZED_WRITE_INIT explained  in 
section A.2.2.1.3 of:
http://ftp.esrf.fr/pub/cs/tango/tango_92.pdf

Hope this helps. Regards,
Jairo

On Wednesday 29 June 2016 08:56:39 Christophe Chappet wrote:

[Christophe Chappet]

Last question, what is the best way to initialize the value of a memorized attribute ?

Do I have to create a "__value" property for each attribute or is there a clever way ?

Christophe

[Emmanuel TAUREL]

Hi Christophe,

On 30/06/2016 10:26, Christophe Chappet wrote:

Last question, what is the best way to initialize the value of a memorized attribute ?

Do I have to create a "__value" property for each attribute or is there a clever way ?

Not at all, this is automatically managed by Tango

Cheers

Emmanuel

[Christophe Chappet]

Yes, I realized that I just have to initialize the class variable and it's works.

The read_myattribut is only called is myattribut is not initialised in the database.

    attr_list = {                'instrument' : [ [        PyTango.ArgType.DevString,
                                                        PyTango.AttrDataFormat.SCALAR,
                                                        PyTango.AttrWriteType.READ_WRITE],
                                                     {
                                                        'label':"instrument",
                                                        'unit':"",
                                                        'format':"",
                                                        'memorized': 'true',
                                                      } ],
                 }
   
class TestDeviceServerImpl(PyTango.Device_4Impl):

    def __init__(self,cl,name):
        PyTango.Device_4Impl.__init__(self,cl,name)
        self.instrument = "1234"
       
    def read_instrument(self, the_att):
        the_att.set_value(self.instrument)

Thanks,

Christophe