triggers : nodata() versus count()?

[mdeavila]

I need to write a trigger that fires if a user parameter has not been able to retrieve any data for the past 12 minutes.

Looks like are two possible trigger functions, nodata() and count().

I'd prefer to use the count() function, since nodata() requires using trapper.

I'd like the trigger to be

({production-vm:ap.count(720)}=0)

Is this the appropriate use of the count() function?

thanks,

Miguel

[lokha]

I need to write a trigger that fires if a user parameter has not been able to retrieve any data for the past 12 minutes.

Looks like are two possible trigger functions, nodata() and count().

I'd prefer to use the count() function, since nodata() requires using trapper.

I'd like the trigger to be

({production-vm:ap.count(720)}=0)

Is this the appropriate use of the count() function?

thanks,

Miguel

i always use nodata and it works
nodata is a special case of count

[dimir]

count() will never fire on 0 without a time shift. You don't want to depend on any value received so use nodata(). And it works on any type of item, not only trapper.