Class: MongoHelper::DataLocker

Inherits:
Object
  • Object
show all
Defined in:
lib/ec2-consistent-backup.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(port = 27017, host = 'localhost') ⇒ DataLocker

Returns a new instance of DataLocker.



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# File 'lib/ec2-consistent-backup.rb', line 95

def initialize(port = 27017, host = 'localhost')
  @m = Mongo::Connection.new(host, port)
  args =  @m['admin'].command({'getCmdLineOpts' => 1 })['argv']
  p = args.index('--dbpath')
  @path = args[p+1]
  @path = File.readlink(@path) if File.symlink?(@path)

end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/ec2-consistent-backup.rb', line 94

def path
  @path
end

Instance Method Details

#lock ⇒ Object 



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# File 'lib/ec2-consistent-backup.rb', line 103

def lock
  return if locked?
  @m.lock!
  while !locked? do
    sleep(1)
  end
  raise "Not locked as asked" if !locked?
end

#locked? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ec2-consistent-backup.rb', line 111

def locked?
  @m.locked?
end

#unlock ⇒ Object 



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# File 'lib/ec2-consistent-backup.rb', line 114

def unlock
  return if !locked?
  raise "Already unlocked" if !locked?
  @m.unlock!
  while locked? do
    sleep(1)
  end
end