khronos 
Simple HTTP-based Job scheduling for the cloud.
Features
- Schedule of HTTP Requests
- Configure recurrency per request
- Log HTTP status code for every request made
- Query the database via REST API
Currently only PostgreSQL is supported. Patches for other databases are welcome.
How it works
Khronos use a rack app to schedule and query for scheduled tasks, and a worker process to execute them in the background.
At 'examples' directory you find two rackup files for these processes.
How to use
Create a scheduled task:
RestClient.post('http://localhost:3000/task', {
:context => 'test',
:at => 24.hours.from_now,
:task_url => "http://myapp.com/do-something-awesome",
:recurrency => 12.hours
})
# => {"active":true,"at":"2012-09-15T21:24:56-03:00","context":"test","id":1,"recurrency":1,"task_url":"http://myapp.com/do-something-awesome"}
Query for a scheduled task:
RestClient.get('http://localhost:3000/task', :params => { :context => 'test' })
# => {"active":true,"at":"2012-09-15T21:24:56-03:00","context":"test","id":1,"recurrency":1,"task_url":"http://myapp.com/do-something-awesome"}
Delete a scheduled task by query:
RestClient.delete('http://localhost:3000/task', :params => { :status_code => 404 })
# => {"deleted":3}
RestClient.delete('http://localhost:3000/task', :params => { :id => 9 })
# => {"deleted":1}
Query for logs for tasks that already ran.
RestClient.get('http://localhost:3000/schedule/logs', :params => { :status_code => 500 })
# => [{"id":3,"schedule_id":1,"started_at":"2012-09-15T13:38:48-03:00","status_code":500},{"id":5,"schedule_id":2,"started_at":"2012-09-15T13:38:48-03:00","status_code":500}]
Note: these examples are using rest-client and activesupport.
Contributing
Feel free to fork and send pull requests with features and/or bug fixes.
License
Khronos is released under the MIT license. Please read the LICENSE file.