On 2007-10-23 15:21, Dirk Meyer wrote:
> As for the API I'm thinking of at/schedule, remove and list.
>
> | t = CronTimer(callback)
> | t.at("*:15")
> | t.at("*:20")
> | t.list() => [ "*:15", "*:20" ]
Is it necessary to support multiple times per CronTimer object? I think
this just complicates the interface. If the user wants the callback to
fire at multiple times he can just instantiate multiple CronTimer objects.
And ...
On 2007-10-23 16:18, Duncan Webb wrote:
> I meant when you set the time, to me:
> | t.at((min=15,sec=30))
> is clearer and more explicit than
> | t.at("*:15:30")
>
> or to run something every 15 minutes
> | t.at((mins=15))
> by making it plural.
I'm not sure that it is clearer and more explicit. Maybe marginally.
Both are ambiguous, and Duncan's has the problem of creating confusion
over the distinction of mins and min next year when we all forget this
discussion. I actually prefer dischi's suggestion, using wildcards.
Alternatively, since it's called CronTimer, we could borrow from
well-established format that cron itself uses. Sure this is a bit
baroque, but it's ubiquitous and lots of people already know it, and the
name CronTimer implies that we ought to support this format. Since
crontab defines only minute precision, we could extend this with another
field for second precision.
t.schedule('* * * * * *') # run every second
Or perhaps allow for missing fields, anchored from the right. So
missing fields on the left will be assumed *:
t.schedule('*') # run every second
t.schedule('*/10') # run every ten seconds
t.schedule('*/5 0') # run every 5 minutes
t.schedule('18-23,0-6 0 0') # run on the hour between 6pm-6am
Another possibility is to support a human readable format, like at(1)
itself uses. This has the benefit of providing very readable code for
the API user, while adding a fair bit of complexity to the
implementation of CronTimer:
t.at('every 5 seconds')
t.at('midnight')
t.at('every other minute')
Some ideas.
Jason.
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