delayed_job

https://github.com/collectiveidea/delayed_job

Ruby

Database based asynchronous priority queue system -- Extracted from Shopify

Delayed::Worker#reserve_and_run_one_job

Run the next job we can get an exclusive lock on.
If no jobs are left we return nil

Source | Google | Stack overflow

Edit

git clone [email protected]:collectiveidea/delayed_job.git
cd delayed_job
open lib/delayed/worker.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Delayed--Worker-reserve_and_run_one_job-for-pr

# Commit to git
git add lib/delayed/worker.rbgit commit -m "better docs for Delayed::Worker#reserve_and_run_one_job"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Delayed--Worker-reserve_and_run_one_job-for-pr
hub pull-request

# Celebrate!