Background Procrastination

Sometimes it's good for programs to put things off for later. Talk given as a lightning talk at the May 2014 meeting of Dayton Clean Coders. http://daytoncleancoders.com

Transcript

1. Mike Yockey Background Procrastination
2. How I learned to stop worrying and love queues.
3. “That’s why there’s the snooze bar. Nothing like starting off the day with a little procrastination" Photo by Rebecca O’Malley https://www.flickr.com/photos/25212862@N04/3970026388/
4. Typical Background Job ‣ Create or retrieve record ‣ Process record ‣ Repeat…lots.
5. Revised Background Job ‣ Create or retrieve all records ‣ Queue each for processing later
6. They are not the same process, don’t treat them the same.
7. class Importer! def self.schedule! Delayed::Job.enqueue Importer.new! end! ! def perform! import_source.each do |import_row|! record = Record.from_import(import_row)! # process record...! end! end! end Importer
8. class Importer! def self.schedule! Delayed::Job.enqueue Importer.new! end! ! def perform! import_source.each do |import_row|! record = Record.from_import(import_row)! Processor.schedule record.id! end! end! end Importer
9. class Processor! def self.schedule(id)! Delayed::Job.enqueue(Processor.new(id))! end! ! def initialize(record_id)! @record_id = record_id! end! ! def perform! return if complete?! # Process record...! end! ! def complete?! end! end Processor
10. Links ‣ https://gist.github.com/yock/ 68d9d7ab5438425a088d ‣ https://gist.github.com/yock/ 68d9d7ab5438425a088d
11. THANKS! @myockey mike@heysparkbox.com