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What exactly does .u.end do?
end:{(neg union/[w[;;0]])@:(`.u.end;x)}
I know the following:
1) that union/[w[;;0]]) is grabbing the handles as integers picking the ones which are repeated.2) Neg obviously makes these negative for async.
3) The apply each left then applies that to the list union/[w[;;0]])
4) the x is usually a date?What is this actually doing, and what is the significance of x as the date?
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2 Replies
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Hi,
1-3) Correct.
4) yes this is a date, you will notice end is called from endofday function in tick.q, which is called when the date rolls, checked on the timer.
endofday:{end d;d+:1;if[l;hclose l;l::0(`.u.ld;d)]};
Where d is the current date the tp is running.
.u.end will be an EOD function on the subscriber, commonly an RDB an example below from r.q:
/ end of day: save, clear, hdb reload .u.end:{t:tables`.;t@:where `g=attr each t@:`sym;.Q.hdpf[`$":",.u.x 1;`:.;x;`sym];@[;`sym;`g#] each t;}Hope that helps.
Patrick
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Hi,
Here is another example:
/end of day function - triggered by tickerplant at EOD .u.end:{ hclose LogfileHandle; /close the connection to the old log file /create the new logfile logfile::hsym `$"RealTimeTradeWithAsofQuotes_",string .z.D; .[logfile;();:;()]; /Initialise the new log file LogfileHandle::hopen logfile; {delete from x}each tables `.};Hope this helps.
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