Generate Code
Let’s generate some code and review it.
❯ jets generate:event cool --trigger scheduled
create app/events/application_event.rb
create app/events/cool_event.rb
The generate code looks like this:
app/events/cool_event.rb
class CoolEvent < ApplicationEvent
rate "10 hours"
def handle
puts "Do something with event #{JSON.dump(event)}"
end
end
Note: The method name does not have to be handle, it can be anything. For Jobs, Jets will create a distinct Lambda function for each public method.
The rate macro-like method tells Jets to create an Amazon EventBridge rule (formerly called CloudWatch Event Rules and Scheduled Expressions) that runs the handle method below it on a schedule. Basically, the CoolEvent#handle Lambda function will run every 10 hours.
You can use cron or rate expressions. Examples:
cron "0 */12 * * ? *" # every 12 hours
rate "10 hours" # every 10 hours
Other Event Triggers
Tip: You can use the --trigger option to generate Jobs with supported event triggers. Example:
jets generate:event cool --trigger sns
Here are some other supported event triggers:
For more info: jets generate:event -h. Also, see the Events Docs for more info.
Next, we’ll test the job locally.