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Overnight Matching Logic

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Ryan Mahoney edited this page Feb 7, 2018 · 1 revision

A user can specify a start time that is higher than the end time, for example:

Weekday Start Subscription: 11pm (23:00:00)
Weekday End Subscription: 1am (01:00:00)

For the purposes of matching, the times associated with a subscription and an alert are both converted into the format timeframe_map which looks like:

%{
  monday:     %{start: 82800, end: 86399},
  tuesday:    %{start: 82800, end: 3600},
  wednesday:  %{start: 82800, end: 3600},
  thursday:   %{start: 82800, end: 3600},
  friday:     %{start: 82800, end: 3600},
  saturday:   %{start: 0,     end: 3600} 
}

When this occurs, this logic will:

  • set the first day as beginning from the provided start time and ending at the last second of the day
  • set the remaining days as the seconds starting with the provided start and end times
  • add an extra day that starts from the first second of the day and ends with the provided end time

The logic in the time_frame_comparison.ex is able to interpret days that have ends that are less than their beginnings and accurately match these subscriptions to alerts.

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