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How to do a concurrent safe method?

thread synchronize concurrent

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#1 dlamet



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Posted 12 March 2014 - 05:02 AM

I need to generate a safe customer facing identifier.  I have a method for pseudo-randomly generating a value for a new record.  I need to make sure that no two requests end up with the same value by happenstance.  Coming from the Java world I'm used to using synchronize on a method, but I'm finding that doesn't work.  Has it been removed?  How can I ensure that I end up with unique keys?



#2 Adam



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Posted 13 March 2014 - 09:28 PM   Best Answer

Assuming this is something you enter in the DB and you want something on a model, I'd go with something simple like this:

before_save do
  until self.identifier
    proposed_identifier = SecureRandom.uuid
    unless self.class.where(:identifier => proposed_identifier).exists?
      self.identifier = proposed_identifier

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