The Zenaton scheduler allows you to create schedules to run tasks and workflows on a recurrent basis.
Normally you would immediately dispatch a workflow or a task using the
dispatch function but you can also
create a schedule so that the workflow or task is automatically dispatched at defined occurrences.
This is useful for processes that you would normally run using cron jobs, for example:
The Zenaton scheduler provides a straightforward way to launch recurrent tasks and workflows by writing it into your code. The scheduler can provide an added level of dependability when combined with other Zenaton features such as automatic retry and alerting.
Create a schedule for any tasks and workflows with the
schedule function by passing a cron string:
RecurrentWorkflow().schedule('* * * * * *')
The cron string parameter will define when the dispatches will occur. See the cron format section to see a complete reference of the format.
delete any created schedules on the Schedules tab on your dashboard.
When a schedule is paused, future instances of the task or workflow will not be dispatched until the schedule has been resumed.
When a schedule has been deleted, no new instances of the task or workflow will be dispatched and the schedule will disapear on your dashboard. If you want to schedule your task or workflow afterward, you would need to create a new schedule.
Note that the scheduler dispatches the linked task or workflow even if the previous execution isn’t finished.
Note also that automatic-retry can lead to overlaps, you should setup your retry policy according to the schedule occurence.
When calling the
schedule function you need to pass a cron string.
Zenaton uses the following cron format to schedule tasks and workflows:
* * * * * * | | | | | | | | | | | +-- Year range: 1970-2099 wildcards: , - * / | | | | +---- Day of the Week range: 0-6 or SUN-SAT wildcards: , - * L # | | | +------ Month of the Year range: 1-12 or JAN-DEC wildcards: , - * / | | +-------- Day of the Month range: 1-31 wildcards: , - * / L W | +---------- Hour range: 0-23 wildcards: , - * / +------------ Minute range: 0-59 wildcards: , - * / Supported alias are: - @minutely run once a minute - @hourly run once an hour - @daily run once a day - @midnight run once a day, same as @daily - @monthly run once a month - @weekly run once a week - @yearly run once a year - @annually run once a year, same as @yearly
View cron expression reference for more informations.
You can also use this tool to help you build your cron expressions.