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Re: Vehicle Information API Draft : Filtering on subscribe to keep performance

From: Rees, Kevron <kevron.m.rees@intel.com>
Date: Mon, 19 May 2014 08:58:11 -0700
Message-ID: <CAFW5wYZJYOhtmYVZeF+QXdqcke6dqZLwEsgg7O2CiOV8fiZsHw@mail.gmail.com>
To: "Daniel.Jutras@continental-corporation.com" <Daniel.Jutras@continental-corporation.com>
Cc: "public-autowebplatform@w3.org" <public-autowebplatform@w3.org>, "internal-autowebplatform@w3.org" <internal-autowebplatform@w3.org>
I agree with the rationale.  IMO, I think we should add this as an
additional argument to subscribe().  Would you like to send a proposal
for the API change, Daniel?  If not, I can try to come up with
something that might work.


On Mon, May 19, 2014 at 8:37 AM,
<Daniel.Jutras@continental-corporation.com> wrote:
> Hello All
> In our last f2f meeting in SF we quickly discussed to add  in the subscribe
> function a parameter for introducing a filter (named hysteresis) .  The goal
> of this parameter is to  limit the number of notification to the callback
> function.  This parameter is very important if we want to keep system
> performance,
> For example, the  engineSpeed (RPM) attribute has a very wide range for
> values.  The RPM will be updated very often (perhaps  every 1 rpm), which
> will generate thousands of notification.    To avoid unreleavant
> notification, an application can set the hysteresis to given value, such
> 1000.   An another Apps (diag. app. for example) can request  this filter to
> 100 (or no no filtering at all) for a better analysis.  Each application
> been free to set this value in accordance with his own requirements.
> Having in mind to keep performance, I strongly propose to add an optional
> parameter (or additional method) to set the hysteresis when we subscribe to
> an attribute.
> I will also send in a separate mail my remarks about the domain for some
> attributes:  i found that some attributes may require a "decimal" (float)
> data type for enhancing the data precision.
> Unfortunately , i won't be able to join the f2f this week.  i will try to
> particapte thursday afternoon by phone
> ................................................
> Sinceres salutations/Kind regards
> Daniel Jutras
> Continental Automotive Rambouillet France SAS
> Business Unit - Infotainment & Connectivity
> 6 rue Jean Moulin - BP65
> F-78512 Rambouillet
> Tel. : +33 (0)
> Fax. : +33 (0)
> E-mail daniel.jutras@continental-corporation.com
> http://www.continental-corporation.com
> Please consider your environmental responsibility before printing this
> e-mail
Received on Monday, 19 May 2014 15:58:39 UTC

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