Module: Distlock

Included in:
DistLock
Defined in:
lib/distlock.rb,
lib/distlock/zk/zk.rb,
lib/distlock/version.rb,
lib/distlock/noop/noop.rb,
lib/distlock/zk/common.rb,
lib/distlock/lock_error.rb,
lib/distlock/redis/redis.rb,
lib/distlock/redis/common.rb,
lib/distlock/zk/exclusive_lock.rb,
lib/distlock/noop/exclusive_lock.rb,
lib/distlock/redis/exclusive_lock.rb

Defined Under Namespace

Modules: Noop, Redis, ZK Classes: LockError

Constant Summary collapse

VERSION = 
"0.1.0"

Class Method Summary collapse

Class Method Details

.logger ⇒ Object 



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# File 'lib/distlock.rb', line 6

def Distlock.logger
  @logger ||= Logger.new(STDOUT)
end

.logger=(logger) ⇒ Object 



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# File 'lib/distlock.rb', line 10

def Distlock.logger=(logger)
  @logger = logger
end

.new_instance(options = {}) ⇒ Object

factory method for creating instances of lock managers



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# File 'lib/distlock.rb', line 15

def Distlock.new_instance(options={})

  # attempt to require zookeeper blindly
  # if require fails, fallback to redis
  # if fails fall back to noop

  locker=nil

  begin
    require 'distlock/zk/zk'
    locker = Distlock::ZK::ExclusiveLock.new(options)
  rescue LoadError => e
    Distlock.logger.debug "failed to require - #{e}"
    
    begin
      require 'distlock/redis/redis'
      locker = Distlock::Redis::ExclusiveLock.new(options)
    rescue LoadError => e
      Distlock.logger.debug "failed to require - #{e}"

      # noop
      require 'distlock/noop/noop'      
      locker = Distlock::Noop::ExclusiveLock.new(options)
    end
  end

  locker.logger = Distlock.logger
  locker
end