Request(channelMap, time, duration, mode)
Where...
recTime is the time stamp on record,
lastTime is the greatest time ring buffer for a channel,
firstTime is the smallest time in the ring buffer for a channel,
maxLastTime is the greatest lastTime over all channels,
minFirstTime is the smallest firstTime over all channels
(for all duration >= 0 is required)
absolute
return records for which time <= recTime <= time+duration
duration=0 is a special case, returns the single record with
recTime <= time
newest
return records for which lastTime-(time+duration) <= recTime <=
lastTime-time; duration = 0 is a special case, returns the single closest
record to lastTime-time such that recTime <= lastTime-time
oldest
return records for which firstTime+time <= recTime <=
firstTime+time+duration; duration = 0 is a special case, returns the single
closest record to firstTime+time such that firstTime+time <= recTime
aligned (e.g. newestAlligned)
return records for which maxLastTime-(time+duration) <= recTime <=
maxLastTime-time
[did you-all ever consider oldestAlligned that is: minFirstTime+time <=
recTime <= minFirstTime+time+duration???]
after
given baseTime is the max of lastTime-duration and time
return records such that baseTime <= recTime <= baseTime+duration
modified
if time < lastTime, compute baseTime is lastTime-duration
return records such that baseTime <= recTime <= baseTime+duration
if time >= lastTime no data is returned
next
given that baseTime is the least recTime such that time <= baseTime
return records for which baseTime <= recTime <= bastTime+duration
previous
given that baseTime is the greatest recTime such that baseTime <= time
return records for which baseTime-duration <= recTime <= baseTime
The generated data are all at all the points between 100 and 600 (including 100,
but not including 600, i.e. 100 <= time < 600), such that
These times were chosen because they are reprecented exactly in floating
point numbers (thus permitting test for equality).
The interactive query gives you the opportunity to submit test queries
against the data in the ring buffer. For exampel a query of:
absolute, 104, 2
returns
For: time = 104.0; duration = 2.0; request type = Absolute
--> data on both channels
Times on Channel 0: 104.00 105.00 106.00
Times on Channel 1: 104.25 104.75 105.25 105.75
'Previos' with time <= maxListTime and duration = 0 only returned data on channel 0
I had one repeatable case where absolute only returned data on channel 0, but I have not been able to duplicate it with the interactive version of the test program, I'm still working on that one.