Class: SafeFork

Inherits:
Object
  • Object
show all
Defined in:
lib/hydra/safe_fork.rb

Class Method Summary collapse

Class Method Details

.fork ⇒ Object 



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# File 'lib/hydra/safe_fork.rb', line 2

def self.fork
  begin
    # remove our connection so it doesn't get cloned
    connection = ActiveRecord::Base.remove_connection if defined?(ActiveRecord)
    # fork a process
    child = Process.fork do
      begin
        # create a new connection and perform the action
        begin
        ActiveRecord::Base.establish_connection((connection || {}).merge({:allow_concurrency => true})) if defined?(ActiveRecord)
        rescue ActiveRecord::AdapterNotSpecified
          # AR was defined but we didn't have a connection
        end
        yield
      ensure
        # make sure we remove the connection before we're done
        ActiveRecord::Base.remove_connection if defined?(ActiveRecord)
      end      
    end
  ensure
    # make sure we re-establish the connection before returning to the main instance
    begin
      ActiveRecord::Base.establish_connection((connection || {}).merge({:allow_concurrency => true})) if defined?(ActiveRecord)
    rescue ActiveRecord::AdapterNotSpecified
      # AR was defined but we didn't have a connection
    end
  end
  return child
end