Review Project
Let’s explore the project code and write some app code.
ApplicationJob
The starter project comes with an ApplicationJob. It looks like this:
app/jobs/application_job.rb
class ApplicationJob < Jets::Job::Base
# Adjust to increase the default timeout for all Job classes
class_timeout 60
end
Generally, your jobs will inherit from this ApplicationJob.
Create a Job
Let’s create some code that does some work. We’ll use a generator again.
❯ jets generate job hard
create app/jobs/hard_job.rb
The generate code looks like this:
app/jobs/hard_job.rb
class HardJob < ApplicationJob
rate "10 hours"
def perform
puts "Do something with event #{event}"
end
end
Note: The method name does not have to be perform, 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 perform method below it on a schedule. Basically, the HardJob#perform 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 Types
Tip: You can use the --type option to generate Jobs with supported event types. Example:
jets generate job hard --type sns
Here are some other supported event types:
For more info: jets generate job -h. Also, see the Events Docs for more info.
Next, we’ll test the job locally.