[Panel-devel] Connection of Sensor and Meter

[Vinay Khaitan]

There is one more benefit of asynchronous update.
Suppose one sensor supplies some datasets (e.g. sensorsensor) . You want one 
meter to show one data from those datasets, other meter to show otherdata 
from that datasets. So those meters may want to have different update 
intervals.
This is perfectly possibly with current dotted notion.
So if sensor is not multiply instantiated, you can have different update 
interval for meters for same sensors within same karambawidget.


On 19/09/05, Vinay Khaitan <vkhaitan at gmail.com> wrote:
> 
> First thing, the problem is about synchronisation of meters, which uses 
> same sensor. It is not possible when using asynchronous update of meters 
> data by sensors. And we need asynchronous updates for singleton pattern. So 
> that we can support different refresh rate for meters.
> 
> We need singleton pattern, because we want to minimise resource uses.
> Imagine a scenario, where there are 4 karambas lying with 4 
> cpusensors(cpusensor is just an example). All of them updates at 2000 ms 
> interval. so within 2 second there would be 4 updates, whereas we could do 
> with single update. That's why we need asynchronous update of meter data.
> this scenario is possible in cases , where suppose a karamba is lying with 
> graph-cpu at bottom of desktop, the other karamba is at the top of desktop 
> with bar meter-cpu sensor. and so on.and we want in the future to make 
> karambas split by dragging. So singleton patter and asynchronous update is 
> inevitable for scaling in future. 
> 
> I find meter connection the best thing. If we think from OO viewpoint, you 
> want that you require synchro between two meters, which implies that there 
> should be made a connection between meters. 
> 
> 
> Don't you think, that if you need to workaround a problem with your 
> > design,
> > it's better changing your design and not introducing strange things? 
> 
> 
> All the designs has some plus and minus points. We should take that 
> design, which is the most suitable.
> I differ from the word "strange". in qt world, where signal-signal 
> connection is possible, this is normal.
> 
> You say it's an easy solution, but I think it's bad since it's a solution
> > ad-hoc for a problem you have with your design. 
> 
> it's not ad-hoc. I find it nicer even in the case, when you dont need 
> them.
> 
> If I wouldn't know anything
> > about that, I couldn't understand why is needed interconnecting meters. 
> 
> 
> That's why I would like to know the viewpoint of other developers.
> Please, from next mail onwards, be kinder to me :))
> 
> cheers, 
> Vinay Khaitan
> 
>
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