Especially after reading this whitepaper, i was left to wonder how a client retrieves data from an AF attribute. Does it use GetValue or GetValues? Using which timestamps.
Let's use an example: a PI WebParts Page with a time webpart, a trend webpart and a value webpart. Both webparts display the value of an attribute configured to use one of my Custom DR's. If i set the timerange webpart on the same page to *-1d and *, what calls are made to the DR for:
- the value webpart? Obviously it returns one value only, but for a single time or a timerange passed through GetValue?
- the trend webpart? It returns interpolated values. If RDA methods supported, will it call PlotValues? If not, subsequent calls to GetValue for each pixel (as explained in the WhitePaper)? Or?