Take a look at kue, which can use Redis-backed queues for periodic tasks, and cron.js, which allows you to use cron's "beloved" patterns for specifying when / how often tasks are run.
F On Sunday, December 16, 2012, Brian Link wrote: > Could be done in redis also, with a sorted set, where the values are json > payloads of task data and the scores are timestamps. On an interval (like > Jonathan suggested) you could do a query for all items older than 'now' and > start processing them. > > On Sunday, December 16, 2012 12:12:11 PM UTC-8, Jonathan Dickinson wrote: >> >> If you care about failure resilience at all: >> >> 1. You will need a pseudoqueue in SQL (or whatever) with a datetime field >> indicating when the event needs to fire. >> 2. Every, say, 5 minutes (settimeout) query SQL for anything that needs >> to happen in the next, say, 6 minutes. >> 3. Calculate the difference between now and when the event needs to occur >> and settimeout. >> *** If you get anything that needed to happen in the past execute it >> immediately. >> >> If your server is clustered you will also need a way to mark a row as >> "server <ID> is dealing with this", "this has been dealt with" (which is >> soon followed by deleting the row). You cluster will also need to be aware >> of failing servers so that you can pick up the work they started but did >> not finish. Your updates have to be atomic (e.g. 'UPDATE [Queue] SET >> [ServerID] = @ThisServer WHERE [ServerID] IS NULL AND [ID] = @RowID'). >> >> This type of pseudoqueue isn't *that* hard to write, you just need to >> think about it a bit. >> >> On Sunday, 16 December 2012 15:53:40 UTC+2, Filipe wrote: >>> >>> Guys, simple question, but I can't find a way to do this: schedule >>> date/time events. >>> >>> For example: get dynamically an event from a database (ie 12:00 >>> 01/01/2013 - "first lunch of 2013") and push it to my users only when local >>> time is exactly 12:00 01/01/2013. >>> >>> What's the clever way to do this? >>> >>> -- > Job Board: http://jobs.nodejs.org/ > Posting guidelines: > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines > You received this message because you are subscribed to the Google > Groups "nodejs" group. > To post to this group, send email to > [email protected]<javascript:_e({}, 'cvml', '[email protected]');> > To unsubscribe from this group, send email to > [email protected] <javascript:_e({}, 'cvml', > 'nodejs%[email protected]');> > For more options, visit this group at > http://groups.google.com/group/nodejs?hl=en?hl=en > -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
