Hi...

> I have a channel_id and I want to get the corresponding pedestal from the
> conditions database.  I have a cached instance of EcalConditions.  Here's
> what I managed to figure out that works:
> 
> ecalConditions.getChannelConstants(ecalConditions.getChannelCollection().findChannel(channel_id)).getCalibration().getPedestal();

Is channel ID here the sequential 1-442 number?  Or is it a cell ID from the hit?  (I think it must be the first.  Otherwise it wouldn’t work!)

That seems like an okay way to do it.  You could add this as a utility method someplace e.g. EcalConditions.findPedestal(channelID) if this needs to be called from multiple places.  The method chaining is a bit ugly I guess.  (It might look a little simpler if you were using directly the EcalCalibrationCollection instead of EcalChannelConstants which is basically just provided for convenience.)

> Also, maybe related to Luca's issue, what happens if the run number changes?
> Will a cached EcalChannelCollection and/or EcalConditions need to be updated manually?

If a new run number is encountered in the same job, the conditions system is completely reset, and new conditions are loaded, as well as a new detector object.  You can catch this via the Driver.detectorChanged() API method.  So basically once you have cached a collection reference, it is only valid for that run.  If you get notified of new detector conditions, then the Driver should update itself accordingly, including setting a reference to the new collection object.

> 
> -Nathan
> 
> 
> On Jan 11, 2015, at 10:06 PM, "McCormick, Jeremy I." <[log in to unmask]> wrote:
> 
>> This util method should do that
>> 
>> EcalChannel channel = EcalConditionsUtil.findChannel(IIdentifierHelper helper, long cellId);
>> 
>> where 
>> 
>> helper = subdetector.getDetectorElement().getIdentifierHelper();
>> 
>> There should be a few examples of it in the code.
>> 
>> Or you can call
>> 
>> EcalChannelCollection.findGeometric(hit.getCellID());
>> 
>> if you have the EcalChannelCollection cached.
>> ________________________________________
>> From: [log in to unmask] <[log in to unmask]> on behalf of Nathan Baltzell <[log in to unmask]>
>> Sent: Sunday, January 11, 2015 3:09 PM
>> To: hps-software
>> Subject: hit channel_id
>> 
>> If I have a RawCalorimeterHit object, and I want the corresponding channel’s unique
>> channel_id from the database.  I came up with this that seems to work (in that it looks
>> like it’s always between 0 and 441, but I didn’t check it any more than that):
>> 
>> findChannel(hit.getCellID()).getCalibration().getChannelId()
>> 
>> Does anyone know if it is correct?
>> 
>> -Nathan
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