Take a look at the Rufus Scheduler http://rufus.rubyforge.org/rufus-scheduler/
I hope this help you, regards. Franco Catena. On Aug 27, 4:59 pm, Rukku Bala <rails-mailing-l...@andreas-s.net> wrote: > Hi, > I am trying to achieve the following.. wondering if there is any way to > achieve this.. > > Some background: > > 1. i have an application where the user can request an specific email to > be sent at a scheduled time. For e.g. lets say user A wants is > scheudling the email to be sent for 12:00pm. This is stored in a table > called "send_notification" where the details is stored. > 2. Another user B can login and schedule an notification say at 11:45am. > > Now, to achieve this.. > Option 1: > If can have a background task that scans through this table and sends > the notification. But if i write it as a task that wakes up every minute > and send the notification, then it has to scan the whole table every > time. Is it OK ?. In a scaled table it could be an issue. > Opton 2: > Maintain a "earliest time" variable in the application. Every time, a > new notification is created, check if this time is earlier than the > "earliest time". If so, then cancel the crontab and reschedule based on > the "earliest time". If not, the crontab will expire and notification > will be sent and scan the whole table and update the "earliest time". > This again has the flaw of scanning the entire table. > > Option 3: > an efficient option is to maintain a heap timer tree based on "shcedule > time". Then the top node timer expires, the notification will be sent. > This would require no scanning of table but maintaining the heap timer. > Is a there a plugin for this ?. > > How does typcially achieve such a thing. > > Thanks. > -- > Posted viahttp://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
