Poor man's distributed lock using SimpleDB. It is useful when you don't want to maintain distributed lock server by yourself.
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install sdb_lock
require 'sdb_lock' lock = SdbLock.new( 'my_app_lock_domain', # SimpleDB domain name to use create_domain: true, # At the first time, you will need to create domain. Note it might take long time. # Other hash members will be passed to AWS::SimpleDB#new as is. # You can set credential by other ways including environmental variables. # See https://github.com/amazonwebservices/aws-sdk-for-ruby # see http://docs.amazonwebservices.com/general/latest/gr/rande.html#sdb_region simple_db_endpoint: "sdb.ap-northeast-1.amazonaws.com", access_key_id: YOUR_AWS_ACCESS_KEY, secret_access_key: YOUR_AWS_SECRET ) locked = lock.try_lock("a1") do # do some work end # if you want to block until gain lock, then use #lock # WARN There is no way to wake up others. It is slow with high contention # because it does polling internally. lock.lock("a1") do # do some work end # List locked resource names lock.locked_resources # Some times lock might remain because of network failure. Then we'll need # a way to unlock these. # # Unlock older than 10 secs. lock.unlock_old(10)
- Lock might remain by network failure or other reason. See
- Number of domains are limited by SimpleDB.
- Each Lock is represented by an item in SimpleDB. Number of items are limited by SimpleDB.
- Fork it
- Create your feature branch (
git checkout -b my-new-feature)
- Commit your changes (
git commit -am 'Added some feature')
- Push to the branch (
git push origin my-new-feature)
- Create new Pull Request