remote_lock

This is a rewrite of a initial extraction from Nick Kallen's cache-money and also a fork from James Golick memcache-lock

This adds supports for memcache or redis as lock storage.

Installation

gem install remote_lock

Initialization

• Lock using memcached:

  # memcache = MemCache.new(YAML.load(File.read("/path/to/memcache/config")))
  # Or whatever way you have your memcache connection
  $lock = RemoteLock.new(RemoteLock::Adapters::Memcached.new(memcache))

• Lock using redis:

  # redis = Redis.new
  # Or whatever way you have your redis connection
  $lock = RemoteLock.new(RemoteLock::Adapters::Redis.new(redis))

Usage

Then, wherever you'd like to lock a key, use it like this:

$lock.synchronize("some-key") do
  # stuff that needs synchronization in here
end

Options:

• TTL

  By default keys will expire after 60 seconds, you can define this per key:

  $lock.synchronize("my-key", expiry: 30.seconds) do ... end

• Attempts

  By default it will try 11 times to lock the resource, this can be set per key:

  $lock.synchronize("my-key", retries: 5) do ... end

• Tries interval

  You can customize the interval between tries, initially it's 10ms:

  $lock.synchronize("my-key", initial_wait: 10e-3) do ... end

For more info, see lib/remote_lock.rb. It's very straightforward to read.

Note on Patches/Pull Requests

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send me a pull request. Bonus points for topic branches.

License

MIT licence. Copyright (c) 2013 HouseTrip Ltd.

Based on the memcache-lock gem: https://github.com/jamesgolick/memcache-lock