Thank you for clarification. I tried:
*try*:
self.lock.acquire()
[... (some code to calculate and change class attributes)]
*finally*:
self.lock.release()
And I hope, that deals with that problem.
Tom Keffer schrieb am Dienstag, 16. Februar 2021 um 22:45:42 UTC+1:
> Yes, this is a concern if attributes are not read-only. The wiki article
> on xtypes has a section about this:
> https://github.com/weewx/weewx/wiki/WeeWX-V4-user-defined-types#subtlety
>
> On Tue, Feb 16, 2021 at 1:26 PM Karen K <[email protected]> wrote:
>
>> Another question: Is it possible that cheetah generator and image
>> generator call the XType extension in parallel from different threads?
>>
>> If so, I guess, locking would be needed for code that alters class
>> attributes.
>>
>> Karen K schrieb am Sonntag, 14. Februar 2021 um 21:55:10 UTC+1:
>>
>>> "Mostly the problem is situated between the chair and the screen." I
>>> should read the documentation more carefully.
>>>
>>> $day and $yesterday need some aggregation. So it is *not possible* to
>>> write $day.GTS or $yesterday.GTS because the aggregation type is
>>> missing. Instead it is necessary to write $day.GTS.last or
>>> $yesterday.GTS.last or something. And then there is a value, even
>>> without having the values in the database. Providing the get_aggregate()
>>> function is sufficient.
>>>
>>> And in this extension all the values are based on outTemp, and outTemp
>>> is included in the database.
>>> Tom Keffer schrieb am Sonntag, 14. Februar 2021 um 19:33:00 UTC+1:
>>>
>>>> To show a value for yesterday, the value would have to be in the
>>>> database.
>>>>
>>>> On Sun, Feb 14, 2021 at 10:29 AM Karen K <[email protected]> wrote:
>>>>
>>>>> Oh, so I mixed it up some way. I registered the XType as a service.
>>>>>
>>>>> Now there are two different classes, and that looks a lot better. The
>>>>> extension calculates the values and draws a graph. Thank you for your
>>>>> advice. It saved a lot of time.
>>>>>
>>>>> $current.GTS displays a value now. $day.GTS and $yesterday.GTS do
>>>>> not.
>>>>>
>>>>> Tom Keffer schrieb am Samstag, 13. Februar 2021 um 23:37:58 UTC+1:
>>>>>
>>>>>> Good start!
>>>>>>
>>>>>> I can see a few issues here.
>>>>>>
>>>>>> 1. All xtype extensions must be registered, otherwise the system has
>>>>>> no way of knowing of their existence. See the section *Registering
>>>>>> your subclass
>>>>>> <https://github.com/weewx/weewx/wiki/WeeWX-V4-user-defined-types#registering-your-subclass>*
>>>>>> for
>>>>>> how to register your xtype.
>>>>>>
>>>>>> 2. From what I can tell, your extension only returns a value for
>>>>>> 'GTSdate', never for 'GTS'.
>>>>>>
>>>>>> 3. I don't quite follow the logic of the loop in get_scalar(), but it
>>>>>> looks like it is trying to keep a running total of something. Just a
>>>>>> warning: this could be very inefficient because an xtype can potentially
>>>>>> get called many times in a template. Would it be possible to refactor
>>>>>> into
>>>>>> a database query?
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Sat, Feb 13, 2021 at 1:05 PM Karen K <[email protected]> wrote:
>>>>>>
>>>>>>> And the cheetah generator's result is
>>>>>>>
>>>>>>> Karen K schrieb am Samstag, 13. Februar 2021 um 22:04:36 UTC+1:
>>>>>>>
>>>>>>>> test skin index.html.tmpl
>>>>>>>>
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