StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<ul> <li>Store/index the events sorted by when they next need attention. This could be in memory or not according to how many there are, how often you make changes, etc. If all of your events fire once a day, this list is basically a circular buffer which only changes when users change their events.</li> <li>Start a timer which will 'tick' at the time of the event at the head of the list. Round up to the next minute if you like.</li> <li>When the timer fires, process all events which are now in the past [edit - and which haven't already been processed], re-insert them into the list if necessary (i.e. if you don't have the "circular buffer" optimisation), and set a new timer.</li> </ul> <p>Obviously, when you change the set of events, or change the time for an existing event, then you may need to reset the timer to make it fire earlier. There's usually no point resetting it to fire later - you may as well just let it go off and do nothing. And if you put an upper limit of one minute on how long the timer can run (or just have a 1 minute recurring timer), then you can get within 1-minute accuracy without ever resetting. This is basically your option 2.</p> <p>Arguably you should use an existing framework rather than rolling your own, but I don't know C# so I have no idea what's available. I'm generally a bit wary of the idea of setting squillions of timers, because some environments don't support that (or don't support it well). Hence this scheme, which requires only one. I don't know whether C# has any problems in that respect, but this scheme can easily be arranged to use O(1) RAM if necessary, which can't be beat.</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload