Ruby-Redis-Lock - Distributed lock for Ruby (using Redis)
A distributed lock that utilizes Redis. It also handles failures. If a process acquires a lock for more than some period of time (default is 60 seconds), the lock is automatically released.
Basically, it follows the algorithm explained here: http://redis.io/commands/setnx
I believe it is an optimistic locking algorithm.
Nevertheless, the algorithm on releasing a lock is improved. Please the comments in http://redis.io/commands/setnx
The example of using it:
$redis = Redis.new $redis.lock('some_name', 60, 10) do # # Do some tasks here # end
The API is below:
lock(lock_name, processing_timeout=60, acquiring_timout=10)
You can change processing_timeout and acquiring_timeout.
The lock will be expired after it has been acquired for a period of time longer than processing_timeout (in seconds).
An error will be raised if the lock cannot be acquired within acquiring_timeout (in seconds).
You can install it directly by:
gem install ruby_redis_lock
or put it in your Gemfile:
- Fork the project
- Install all dependencies with
- Start Redis and running all test cases
bundle exec rspec spec/*
- Add a feature, if everything is ok
- Write tests for the feature
- Send me a pull request
Tanin Na Nakorn
Boring legal stuff
You can do whatever you want with it